am d95a687e: Sync sample prebuilts for mnc-dev

* commit 'd95a687e5a9820f9859997dc733da9a18afb57c2':
  Sync sample prebuilts for mnc-dev

73 files changed, 1151 insertions, 440 deletions

diff --git a/samples/browseable/AgendaData/Application/src/com.example.android.wearable.agendadata/MainActivity.java b/samples/browseable/AgendaData/Application/src/com.example.android.wearable.agendadata/MainActivity.java
index 8e4063d8c..34e327b3a 100644
--- a/samples/browseable/AgendaData/Application/src/com.example.android.wearable.agendadata/MainActivity.java
+++ b/samples/browseable/AgendaData/Application/src/com.example.android.wearable.agendadata/MainActivity.java
@@ -33,7 +33,6 @@ import com.google.android.gms.common.api.GoogleApiClient;
 import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
 import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
 import com.google.android.gms.common.api.ResultCallback;
-import com.google.android.gms.common.data.FreezableUtils;
 import com.google.android.gms.wearable.DataApi;
 import com.google.android.gms.wearable.DataItem;
 import com.google.android.gms.wearable.DataItemBuffer;
@@ -96,28 +95,29 @@ public class MainActivity extends Activity implements NodeApi.NodeListener, Conn
                     .setResultCallback(new ResultCallback<DataItemBuffer>() {
                         @Override
                         public void onResult(DataItemBuffer result) {
-                            if (result.getStatus().isSuccess()) {
-                                deleteDataItems(result);
-                            } else {
-                                if (Log.isLoggable(TAG, Log.DEBUG)) {
-                                    Log.d(TAG, "onDeleteEventsClicked(): failed to get Data Items");
+                            try {
+                                if (result.getStatus().isSuccess()) {
+                                    deleteDataItems(result);
+                                } else {
+                                    if (Log.isLoggable(TAG, Log.DEBUG)) {
+                                        Log.d(TAG,"onDeleteEventsClicked(): failed to get Data "
+                                                + "Items");
+
+                                    }
                                 }
+                            } finally {
+                                result.release();
                             }
-                            result.close();
                         }
                     });
         } else {
             Log.e(TAG, "Failed to delete data items"
-                     + " - Client disconnected from Google Play Services");
+                    + " - Client disconnected from Google Play Services");
         }
     }
 
-    private void deleteDataItems(DataItemBuffer dataItems) {
+    private void deleteDataItems(final DataItemBuffer dataItemList) {
         if (mGoogleApiClient.isConnected()) {
-            // Store the DataItem URIs in a List and close the buffer. Then use these URIs
-            // to delete the DataItems.
-            final List<DataItem> dataItemList = FreezableUtils.freezeIterable(dataItems);
-            dataItems.close();
             for (final DataItem dataItem : dataItemList) {
                 final Uri dataItemUri = dataItem.getUri();
                 // In a real calendar application, this might delete the corresponding calendar
diff --git a/samples/browseable/AgendaData/Wearable/src/com.example.android.wearable.agendadata/HomeListenerService.java b/samples/browseable/AgendaData/Wearable/src/com.example.android.wearable.agendadata/HomeListenerService.java
index ef47977e3..0cbda71e8 100644
--- a/samples/browseable/AgendaData/Wearable/src/com.example.android.wearable.agendadata/HomeListenerService.java
+++ b/samples/browseable/AgendaData/Wearable/src/com.example.android.wearable.agendadata/HomeListenerService.java
@@ -75,7 +75,6 @@ public class HomeListenerService extends WearableListenerService {
                 UpdateNotificationForDataItem(event.getDataItem());
             }
         }
-        dataEvents.close();
     }
 
     @Override
diff --git a/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/AdvertiserFragment.java b/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/AdvertiserFragment.java
index f8daefb04..f3645fc29 100644
--- a/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/AdvertiserFragment.java
+++ b/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/AdvertiserFragment.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.example.android.bluetoothadvertisements;
 
 import android.bluetooth.BluetoothAdapter;
diff --git a/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/Constants.java b/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/Constants.java
index d3941e2ab..793ac9214 100644
--- a/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/Constants.java
+++ b/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/Constants.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.example.android.bluetoothadvertisements;
 
 import android.os.ParcelUuid;
diff --git a/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/MainActivity.java b/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/MainActivity.java
index f0044a3e8..871935d9d 100644
--- a/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/MainActivity.java
+++ b/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/MainActivity.java
@@ -1,18 +1,18 @@
 /*
-* Copyright 2013 The Android Open Source Project
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 package com.example.android.bluetoothadvertisements;
 
diff --git a/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/ScanResultAdapter.java b/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/ScanResultAdapter.java
index 0f905ea7a..f3c141d36 100644
--- a/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/ScanResultAdapter.java
+++ b/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/ScanResultAdapter.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.example.android.bluetoothadvertisements;
 
 import android.bluetooth.le.ScanResult;
diff --git a/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/ScannerFragment.java b/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/ScannerFragment.java
index b9ad4d966..ebb1ad085 100644
--- a/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/ScannerFragment.java
+++ b/samples/browseable/BluetoothAdvertisements/src/com.example.android.bluetoothadvertisements/ScannerFragment.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.example.android.bluetoothadvertisements;
 
 import android.bluetooth.BluetoothAdapter;
diff --git a/samples/browseable/Camera2Basic/AndroidManifest.xml b/samples/browseable/Camera2Basic/AndroidManifest.xml
index 87d9af131..5b0b5b041 100644
--- a/samples/browseable/Camera2Basic/AndroidManifest.xml
+++ b/samples/browseable/Camera2Basic/AndroidManifest.xml
@@ -15,16 +15,14 @@
  limitations under the License.
 -->
 
-
-
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.android.camera2basic"
-    android:versionCode="1"
-    android:versionName="1.0">
+    package="com.example.android.camera2basic">
 
-    <!-- Min/target SDK versions (<uses-sdk>) managed by build.gradle -->
     <uses-permission android:name="android.permission.CAMERA" />
 
+    <uses-feature android:name="android.hardware.camera" />
+    <uses-feature android:name="android.hardware.camera.autofocus" />
+
     <application android:allowBackup="true"
         android:label="@string/app_name"
         android:icon="@drawable/ic_launcher"
diff --git a/samples/browseable/Camera2Basic/res/layout-land/fragment_camera2_basic.xml b/samples/browseable/Camera2Basic/res/layout-land/fragment_camera2_basic.xml
index 3a3e2ff36..8b2e1ad1d 100644
--- a/samples/browseable/Camera2Basic/res/layout-land/fragment_camera2_basic.xml
+++ b/samples/browseable/Camera2Basic/res/layout-land/fragment_camera2_basic.xml
@@ -26,14 +26,14 @@
         android:layout_alignParentTop="true" />
 
     <FrameLayout
+        android:id="@+id/control"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true"
         android:layout_alignParentEnd="true"
         android:layout_alignParentTop="true"
-        android:layout_below="@id/texture"
         android:layout_toRightOf="@id/texture"
-        android:background="#4285f4"
+        android:background="@color/control_background"
         android:orientation="horizontal">
 
         <Button
diff --git a/samples/browseable/Camera2Basic/res/layout/fragment_camera2_basic.xml b/samples/browseable/Camera2Basic/res/layout/fragment_camera2_basic.xml
index 7d05ab3f4..9c6dc6505 100644
--- a/samples/browseable/Camera2Basic/res/layout/fragment_camera2_basic.xml
+++ b/samples/browseable/Camera2Basic/res/layout/fragment_camera2_basic.xml
@@ -25,12 +25,12 @@
         android:layout_alignParentTop="true" />
 
     <FrameLayout
+        android:id="@+id/control"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="112dp"
         android:layout_alignParentBottom="true"
         android:layout_alignParentStart="true"
-        android:layout_below="@id/texture"
-        android:background="#4285f4">
+        android:background="@color/control_background">
 
         <Button
             android:id="@+id/picture"
diff --git a/samples/browseable/Camera2Basic/res/values/colors.xml b/samples/browseable/Camera2Basic/res/values/colors.xml
new file mode 100644
index 000000000..4b75d2b2b
--- /dev/null
+++ b/samples/browseable/Camera2Basic/res/values/colors.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+ Copyright 2015 The Android Open Source Project
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+<resources>
+    <color name="control_background">#cc4285f4</color>
+</resources>
diff --git a/samples/browseable/Camera2Basic/src/com.example.android.camera2basic/Camera2BasicFragment.java b/samples/browseable/Camera2Basic/src/com.example.android.camera2basic/Camera2BasicFragment.java
index 2414ed657..020ca14d3 100644
--- a/samples/browseable/Camera2Basic/src/com.example.android.camera2basic/Camera2BasicFragment.java
+++ b/samples/browseable/Camera2Basic/src/com.example.android.camera2basic/Camera2BasicFragment.java
@@ -55,7 +55,6 @@ import android.view.ViewGroup;
 import android.widget.Toast;
 
 import java.io.File;
-import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.nio.ByteBuffer;
@@ -264,14 +263,16 @@ public class Camera2BasicFragment extends Fragment implements View.OnClickListen
                     break;
                 }
                 case STATE_WAITING_LOCK: {
-                    int afState = result.get(CaptureResult.CONTROL_AF_STATE);
-                    if (CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED == afState ||
+                    Integer afState = result.get(CaptureResult.CONTROL_AF_STATE);
+                    if (afState == null) {
+                        captureStillPicture();
+                    } else if (CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED == afState ||
                             CaptureResult.CONTROL_AF_STATE_NOT_FOCUSED_LOCKED == afState) {
                         // CONTROL_AE_STATE can be null on some devices
                         Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
                         if (aeState == null ||
                                 aeState == CaptureResult.CONTROL_AE_STATE_CONVERGED) {
-                            mState = STATE_WAITING_NON_PRECAPTURE;
+                            mState = STATE_PICTURE_TAKEN;
                             captureStillPicture();
                         } else {
                             runPrecaptureSequence();
@@ -636,6 +637,8 @@ public class Camera2BasicFragment extends Fragment implements View.OnClickListen
                     (float) viewWidth / mPreviewSize.getWidth());
             matrix.postScale(scale, scale, centerX, centerY);
             matrix.postRotate(90 * (rotation - 2), centerX, centerY);
+        } else if (Surface.ROTATION_180 == rotation) {
+            matrix.postRotate(180, centerX, centerY);
         }
         mTextureView.setTransform(matrix);
     }
@@ -657,7 +660,7 @@ public class Camera2BasicFragment extends Fragment implements View.OnClickListen
                     CameraMetadata.CONTROL_AF_TRIGGER_START);
             // Tell #mCaptureCallback to wait for the lock.
             mState = STATE_WAITING_LOCK;
-            mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), mCaptureCallback,
+            mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
                     mBackgroundHandler);
         } catch (CameraAccessException e) {
             e.printStackTrace();
@@ -794,8 +797,6 @@ public class Camera2BasicFragment extends Fragment implements View.OnClickListen
             try {
                 output = new FileOutputStream(mFile);
                 output.write(bytes);
-            } catch (FileNotFoundException e) {
-                e.printStackTrace();
             } catch (IOException e) {
                 e.printStackTrace();
             } finally {
diff --git a/samples/browseable/ConfirmCredential/src/com.example.android.confirmcredential/MainActivity.java b/samples/browseable/ConfirmCredential/src/com.example.android.confirmcredential/MainActivity.java
index b8cf6e111..c19875a3c 100644
--- a/samples/browseable/ConfirmCredential/src/com.example.android.confirmcredential/MainActivity.java
+++ b/samples/browseable/ConfirmCredential/src/com.example.android.confirmcredential/MainActivity.java
@@ -95,7 +95,7 @@ public class MainActivity extends Activity {
      * Tries to encrypt some data with the generated key in {@link #createKey} which is
      * only works if the user has just authenticated via device credentials.
      */
-    private void tryEncrypt() {
+    private boolean tryEncrypt() {
         try {
             KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
             keyStore.load(null);
@@ -111,15 +111,18 @@ public class MainActivity extends Activity {
 
             // If the user has recently authenticated, you will reach here.
             showAlreadyAuthenticated();
+            return true;
         } catch (UserNotAuthenticatedException e) {
             // User is not authenticated, let's authenticate with device credentials.
             showAuthenticationScreen();
+            return false;
         } catch (KeyPermanentlyInvalidatedException e) {
             // This happens if the lock screen has been disabled or reset after the key was
             // generated after the key was generated.
             Toast.makeText(this, "Keys are invalidated after created. Retry the purchase\n"
                             + e.getMessage(),
                     Toast.LENGTH_LONG).show();
+            return false;
         } catch (BadPaddingException | IllegalBlockSizeException | KeyStoreException |
                 CertificateException | UnrecoverableKeyException | IOException
                 | NoSuchPaddingException | NoSuchAlgorithmException | InvalidKeyException e) {
@@ -172,7 +175,9 @@ public class MainActivity extends Activity {
         if (requestCode == REQUEST_CODE_CONFIRM_DEVICE_CREDENTIALS) {
             // Challenge completed, proceed with using cipher
             if (resultCode == RESULT_OK) {
-                showPurchaseConfirmation();
+                if (tryEncrypt()) {
+                    showPurchaseConfirmation();
+                }
             } else {
                 // The user canceled or didn’t complete the lock screen
                 // operation. Go to error/cancellation flow.
diff --git a/samples/browseable/DataLayer/Application/src/com.example.android.wearable.datalayer/MainActivity.java b/samples/browseable/DataLayer/Application/src/com.example.android.wearable.datalayer/MainActivity.java
index e6e4aa2cf..1c67c0e03 100644
--- a/samples/browseable/DataLayer/Application/src/com.example.android.wearable.datalayer/MainActivity.java
+++ b/samples/browseable/DataLayer/Application/src/com.example.android.wearable.datalayer/MainActivity.java
@@ -216,8 +216,8 @@ public class MainActivity extends Activity implements DataApi.DataListener,
     @Override //DataListener
     public void onDataChanged(DataEventBuffer dataEvents) {
         LOGD(TAG, "onDataChanged: " + dataEvents);
+        // Need to freeze the dataEvents so they will exist later on the UI thread
         final List<DataEvent> events = FreezableUtils.freezeIterable(dataEvents);
-        dataEvents.close();
         runOnUiThread(new Runnable() {
             @Override
             public void run() {
diff --git a/samples/browseable/DataLayer/Wearable/src/com.example.android.wearable.datalayer/DataLayerListenerService.java b/samples/browseable/DataLayer/Wearable/src/com.example.android.wearable.datalayer/DataLayerListenerService.java
index 34d3ca390..67dcef94f 100644
--- a/samples/browseable/DataLayer/Wearable/src/com.example.android.wearable.datalayer/DataLayerListenerService.java
+++ b/samples/browseable/DataLayer/Wearable/src/com.example.android.wearable.datalayer/DataLayerListenerService.java
@@ -22,7 +22,6 @@ import android.util.Log;
 
 import com.google.android.gms.common.ConnectionResult;
 import com.google.android.gms.common.api.GoogleApiClient;
-import com.google.android.gms.common.data.FreezableUtils;
 import com.google.android.gms.wearable.DataEvent;
 import com.google.android.gms.wearable.DataEventBuffer;
 import com.google.android.gms.wearable.MessageEvent;
@@ -59,8 +58,6 @@ public class DataLayerListenerService extends WearableListenerService {
     @Override
     public void onDataChanged(DataEventBuffer dataEvents) {
         LOGD(TAG, "onDataChanged: " + dataEvents);
-        final List<DataEvent> events = FreezableUtils.freezeIterable(dataEvents);
-        dataEvents.close();
         if (!mGoogleApiClient.isConnected() || !mGoogleApiClient.isConnecting()) {
             ConnectionResult connectionResult = mGoogleApiClient
                     .blockingConnect(30, TimeUnit.SECONDS);
@@ -72,7 +69,7 @@ public class DataLayerListenerService extends WearableListenerService {
         }
 
         // Loop through the events and send a message back to the node that created the data item.
-        for (DataEvent event : events) {
+        for (DataEvent event : dataEvents) {
             Uri uri = event.getDataItem().getUri();
             String path = uri.getPath();
             if (COUNT_PATH.equals(path)) {
diff --git a/samples/browseable/DataLayer/Wearable/src/com.example.android.wearable.datalayer/MainActivity.java b/samples/browseable/DataLayer/Wearable/src/com.example.android.wearable.datalayer/MainActivity.java
index 7d2a28c8c..678e428ca 100644
--- a/samples/browseable/DataLayer/Wearable/src/com.example.android.wearable.datalayer/MainActivity.java
+++ b/samples/browseable/DataLayer/Wearable/src/com.example.android.wearable.datalayer/MainActivity.java
@@ -42,7 +42,6 @@ import com.google.android.gms.common.api.GoogleApiClient;
 import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
 import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
 import com.google.android.gms.common.api.ResultCallback;
-import com.google.android.gms.common.data.FreezableUtils;
 import com.google.android.gms.wearable.Asset;
 import com.google.android.gms.wearable.CapabilityApi;
 import com.google.android.gms.wearable.CapabilityInfo;
@@ -151,9 +150,7 @@ public class MainActivity extends Activity implements ConnectionCallbacks,
     public void onDataChanged(DataEventBuffer dataEvents) {
         LOGD(TAG, "onDataChanged(): " + dataEvents);
 
-        final List<DataEvent> events = FreezableUtils.freezeIterable(dataEvents);
-        dataEvents.close();
-        for (DataEvent event : events) {
+        for (DataEvent event : dataEvents) {
             if (event.getType() == DataEvent.TYPE_CHANGED) {
                 String path = event.getDataItem().getUri().getPath();
                 if (DataLayerListenerService.IMAGE_PATH.equals(path)) {
diff --git a/samples/browseable/ElizaChat/src/com.example.android.wearable.elizachat/MainActivity.java b/samples/browseable/ElizaChat/src/com.example.android.wearable.elizachat/MainActivity.java
index 982e3def5..2e132a8fc 100644
--- a/samples/browseable/ElizaChat/src/com.example.android.wearable.elizachat/MainActivity.java
+++ b/samples/browseable/ElizaChat/src/com.example.android.wearable.elizachat/MainActivity.java
@@ -55,11 +55,12 @@ public class MainActivity extends Activity {
             }
         };
         mHistoryView = (TextView) findViewById(R.id.history);
-        startResponderService();
+        startResponderService(ResponderService.ACTION_INCOMING);
     }
 
-    private void startResponderService() {
-        Intent serviceIntent = new Intent(ResponderService.ACTION_INCOMING);
+    private void startResponderService(String action) {
+        Intent serviceIntent = new Intent(this, ResponderService.class);
+        serviceIntent.setAction(action);
         startService(serviceIntent);
     }
 
@@ -69,9 +70,7 @@ public class MainActivity extends Activity {
         LocalBroadcastManager.getInstance(this).registerReceiver(mReceiver,
                 new IntentFilter(ACTION_NOTIFY));
         mHistoryView.setText("");
-        Intent serviceIntent = new Intent(ACTION_GET_CONVERSATION);
-        startService(serviceIntent);
-
+        startResponderService(ACTION_GET_CONVERSATION);
     }
 
     @Override
diff --git a/samples/browseable/FindMyPhone/Application/src/com.example.android.wearable.findphone/SoundAlarmListenerService.java b/samples/browseable/FindMyPhone/Application/src/com.example.android.wearable.findphone/SoundAlarmListenerService.java
index c89db9d3c..3de750158 100644
--- a/samples/browseable/FindMyPhone/Application/src/com.example.android.wearable.findphone/SoundAlarmListenerService.java
+++ b/samples/browseable/FindMyPhone/Application/src/com.example.android.wearable.findphone/SoundAlarmListenerService.java
@@ -95,7 +95,6 @@ public class SoundAlarmListenerService extends WearableListenerService {
                 }
             }
         }
-        dataEvents.close();
     }
 
 }
diff --git a/samples/browseable/FindMyPhone/Wearable/src/com.example.android.wearable.findphone/FindPhoneService.java b/samples/browseable/FindMyPhone/Wearable/src/com.example.android.wearable.findphone/FindPhoneService.java
index 97204b475..c6c6d67b5 100644
--- a/samples/browseable/FindMyPhone/Wearable/src/com.example.android.wearable.findphone/FindPhoneService.java
+++ b/samples/browseable/FindMyPhone/Wearable/src/com.example.android.wearable.findphone/FindPhoneService.java
@@ -73,19 +73,22 @@ public class FindPhoneService extends IntentService implements GoogleApiClient.C
             if (intent.getAction().equals(ACTION_TOGGLE_ALARM)) {
                 // Get current state of the alarm.
                 DataItemBuffer result = Wearable.DataApi.getDataItems(mGoogleApiClient).await();
-                if (result.getStatus().isSuccess()) {
-                    if (result.getCount() == 1) {
-                        alarmOn = DataMap.fromByteArray(result.get(0).getData())
-                                .getBoolean(FIELD_ALARM_ON, false);
-                    } else {
-                        Log.e(TAG, "Unexpected number of DataItems found.\n"
-                                + "\tExpected: 1\n"
-                                + "\tActual: " + result.getCount());
+                try {
+                    if (result.getStatus().isSuccess()) {
+                        if (result.getCount() == 1) {
+                            alarmOn = DataMap.fromByteArray(result.get(0).getData())
+                                    .getBoolean(FIELD_ALARM_ON, false);
+                        } else {
+                            Log.e(TAG, "Unexpected number of DataItems found.\n"
+                                    + "\tExpected: 1\n"
+                                    + "\tActual: " + result.getCount());
+                        }
+                    } else if (Log.isLoggable(TAG, Log.DEBUG)) {
+                        Log.d(TAG, "onHandleIntent: failed to get current alarm state");
                     }
-                } else if (Log.isLoggable(TAG, Log.DEBUG)) {
-                    Log.d(TAG, "onHandleIntent: failed to get current alarm state");
+                } finally {
+                    result.release();
                 }
-                result.close();
                 // Toggle alarm.
                 alarmOn = !alarmOn;
                 // Change notification text based on new value of alarmOn.
diff --git a/samples/browseable/FingerprintDialog/AndroidManifest.xml b/samples/browseable/FingerprintDialog/AndroidManifest.xml
index 5f754ad46..3b19fbec0 100644
--- a/samples/browseable/FingerprintDialog/AndroidManifest.xml
+++ b/samples/browseable/FingerprintDialog/AndroidManifest.xml
@@ -35,7 +35,9 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
-    </application>
-
 
+        <activity
+            android:name=".SettingsActivity"
+            android:label="@string/action_settings" />
+    </application>
 </manifest>
diff --git a/samples/browseable/FingerprintDialog/res/layout/fingerprint_dialog_backup.xml b/samples/browseable/FingerprintDialog/res/layout/fingerprint_dialog_backup.xml
index 0b88e3311..2be05b11b 100644
--- a/samples/browseable/FingerprintDialog/res/layout/fingerprint_dialog_backup.xml
+++ b/samples/browseable/FingerprintDialog/res/layout/fingerprint_dialog_backup.xml
@@ -16,21 +16,37 @@
   -->
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/backup_container"
-    android:layout_width="match_parent" android:layout_height="match_parent"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
     android:paddingTop="16dp"
     android:paddingBottom="8dp">
 
-    <TextView
+    <FrameLayout
+        android:id="@+id/description"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:textAppearance="@android:style/TextAppearance.Material.Subhead"
-        android:text="@string/password_description"
-        android:id="@+id/description"
         android:layout_alignParentTop="true"
         android:layout_alignParentStart="true"
         android:layout_marginStart="24dp"
         android:layout_marginEnd="24dp"
-        android:textColor="?android:attr/textColorSecondary"/>
+        >
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textAppearance="@android:style/TextAppearance.Material.Subhead"
+            android:text="@string/password_description"
+            android:id="@+id/password_description"
+            android:textColor="?android:attr/textColorSecondary" />
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textAppearance="@android:style/TextAppearance.Material.Subhead"
+            android:text="@string/new_fingerprint_enrolled_description"
+            android:id="@+id/new_fingerprint_enrolled_description"
+            android:visibility="gone"
+            android:textColor="?android:attr/textColorSecondary" />
+    </FrameLayout>
 
     <EditText
         android:layout_width="wrap_content"
@@ -46,4 +62,17 @@
         android:layout_marginEnd="20dp"
         android:layout_alignParentStart="true" />
 
+    <CheckBox
+        android:id="@+id/use_fingerprint_in_future_check"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/password"
+        android:layout_alignParentStart="true"
+        android:layout_marginTop="16dp"
+        android:layout_marginStart="20dp"
+        android:layout_marginEnd="20dp"
+        android:checked="true"
+        android:visibility="gone"
+        android:text="@string/use_fingerprint_in_future" />
+
 </RelativeLayout>
\ No newline at end of file
diff --git a/samples/browseable/FingerprintDialog/res/layout/fingerprint_dialog_content.xml b/samples/browseable/FingerprintDialog/res/layout/fingerprint_dialog_content.xml
index b56ccbbce..3929ebae6 100644
--- a/samples/browseable/FingerprintDialog/res/layout/fingerprint_dialog_content.xml
+++ b/samples/browseable/FingerprintDialog/res/layout/fingerprint_dialog_content.xml
@@ -19,8 +19,8 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="8dp"
-    android:paddingLeft="24dp"
-    android:paddingRight="24dp"
+    android:paddingStart="24dp"
+    android:paddingEnd="24dp"
     android:paddingTop="16dp">
 
     <TextView
@@ -50,7 +50,7 @@
         android:layout_height="wrap_content"
         android:layout_alignBottom="@+id/fingerprint_icon"
         android:layout_alignTop="@+id/fingerprint_icon"
-        android:layout_marginLeft="16dp"
+        android:layout_marginStart="16dp"
         android:layout_toEndOf="@+id/fingerprint_icon"
         android:gravity="center_vertical"
         android:text="@string/fingerprint_hint"
diff --git a/samples/browseable/FingerprintDialog/res/menu/menu_main.xml b/samples/browseable/FingerprintDialog/res/menu/menu_main.xml
new file mode 100644
index 000000000..73f5e89a0
--- /dev/null
+++ b/samples/browseable/FingerprintDialog/res/menu/menu_main.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2015 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License
+  -->
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools" tools:context=".MainActivity">
+    <item android:id="@+id/action_settings" android:title="@string/action_settings"
+        android:orderInCategory="100" android:showAsAction="never" />
+</menu>
diff --git a/samples/browseable/FingerprintDialog/res/values/strings.xml b/samples/browseable/FingerprintDialog/res/values/strings.xml
index 8a6ecde75..9f5a6fd14 100644
--- a/samples/browseable/FingerprintDialog/res/values/strings.xml
+++ b/samples/browseable/FingerprintDialog/res/values/strings.xml
@@ -31,4 +31,8 @@
     <string name="item_price">$62.68</string>
     <string name="item_description">Mesh backpack in white. Black textile trim throughout.</string>
     <string name="purchase_done">Purchase successful</string>
+    <string name="new_fingerprint_enrolled_description">A new fingerprint was added to this device, so your password is required.</string>
+    <string name="use_fingerprint_in_future">Use fingerprint in the future</string>
+    <string name="use_fingerprint_to_authenticate_title">Use fingerprint to authenticate</string>
+    <string name="use_fingerprint_to_authenticate_key" >use_fingerprint_to_authenticate_key</string>
 </resources>
diff --git a/samples/browseable/FingerprintDialog/res/xml/preferences.xml b/samples/browseable/FingerprintDialog/res/xml/preferences.xml
new file mode 100644
index 000000000..761391d5a
--- /dev/null
+++ b/samples/browseable/FingerprintDialog/res/xml/preferences.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2015 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License
+  -->
+<PreferenceScreen  xmlns:android="http://schemas.android.com/apk/res/android">
+    <CheckBoxPreference
+        android:key="@string/use_fingerprint_to_authenticate_key"
+        android:title="@string/use_fingerprint_to_authenticate_title"
+        android:persistent="true"
+        android:defaultValue="true" />
+</PreferenceScreen>
\ No newline at end of file
diff --git a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintAuthenticationDialogFragment.java b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintAuthenticationDialogFragment.java
index 57c00de08..8909f752f 100644
--- a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintAuthenticationDialogFragment.java
+++ b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintAuthenticationDialogFragment.java
@@ -17,6 +17,7 @@
 package com.example.android.fingerprintdialog;
 
 import android.app.DialogFragment;
+import android.content.SharedPreferences;
 import android.hardware.fingerprint.FingerprintManager;
 import android.os.Bundle;
 import android.view.KeyEvent;
@@ -26,6 +27,7 @@ import android.view.ViewGroup;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.Button;
+import android.widget.CheckBox;
 import android.widget.EditText;
 import android.widget.ImageView;
 import android.widget.TextView;
@@ -44,6 +46,9 @@ public class FingerprintAuthenticationDialogFragment extends DialogFragment
     private View mFingerprintContent;
     private View mBackupContent;
     private EditText mPassword;
+    private CheckBox mUseFingerprintFutureCheckBox;
+    private TextView mPasswordDescriptionTextView;
+    private TextView mNewFingerprintEnrolledTextView;
 
     private Stage mStage = Stage.FINGERPRINT;
 
@@ -52,6 +57,7 @@ public class FingerprintAuthenticationDialogFragment extends DialogFragment
 
     @Inject FingerprintUiHelper.FingerprintUiHelperBuilder mFingerprintUiHelperBuilder;
     @Inject InputMethodManager mInputMethodManager;
+    @Inject SharedPreferences mSharedPreferences;
 
     @Inject
     public FingerprintAuthenticationDialogFragment() {}
@@ -93,6 +99,11 @@ public class FingerprintAuthenticationDialogFragment extends DialogFragment
         mBackupContent = v.findViewById(R.id.backup_container);
         mPassword = (EditText) v.findViewById(R.id.password);
         mPassword.setOnEditorActionListener(this);
+        mPasswordDescriptionTextView = (TextView) v.findViewById(R.id.password_description);
+        mUseFingerprintFutureCheckBox = (CheckBox)
+                v.findViewById(R.id.use_fingerprint_in_future_check);
+        mNewFingerprintEnrolledTextView = (TextView)
+                v.findViewById(R.id.new_fingerprint_enrolled_description);
         mFingerprintUiHelper = mFingerprintUiHelperBuilder.build(
                 (ImageView) v.findViewById(R.id.fingerprint_icon),
                 (TextView) v.findViewById(R.id.fingerprint_status), this);
@@ -114,6 +125,10 @@ public class FingerprintAuthenticationDialogFragment extends DialogFragment
         }
     }
 
+    public void setStage(Stage stage) {
+        mStage = stage;
+    }
+
     @Override
     public void onPause() {
         super.onPause();
@@ -149,12 +164,25 @@ public class FingerprintAuthenticationDialogFragment extends DialogFragment
      * let's the activity know about the result.
      */
     private void verifyPassword() {
-        if (checkPassword(mPassword.getText().toString())) {
-            ((MainActivity) getActivity()).onPurchased(false /* without Fingerprint */);
-            dismiss();
-        } else {
-            // assume the password is always correct.
+        if (!checkPassword(mPassword.getText().toString())) {
+            return;
         }
+        MainActivity activity = ((MainActivity) getActivity());
+        if (mStage == Stage.NEW_FINGERPRINT_ENROLLED) {
+            SharedPreferences.Editor editor = mSharedPreferences.edit();
+            editor.putBoolean(getString(R.string.use_fingerprint_to_authenticate_key),
+                    mUseFingerprintFutureCheckBox.isChecked());
+            editor.apply();
+
+            if (mUseFingerprintFutureCheckBox.isChecked()) {
+                // Re-create the key so that fingerprints including new ones are validated.
+                activity.createKey();
+                mStage = Stage.FINGERPRINT;
+            }
+        }
+        mPassword.setText("");
+        ((MainActivity) getActivity()).onPurchased(false /* without Fingerprint */);
+        dismiss();
     }
 
     /**
@@ -181,11 +209,18 @@ public class FingerprintAuthenticationDialogFragment extends DialogFragment
                 mFingerprintContent.setVisibility(View.VISIBLE);
                 mBackupContent.setVisibility(View.GONE);
                 break;
+            case NEW_FINGERPRINT_ENROLLED:
+                // Intentional fall through
             case PASSWORD:
                 mCancelButton.setText(R.string.cancel);
                 mSecondDialogButton.setText(R.string.ok);
                 mFingerprintContent.setVisibility(View.GONE);
                 mBackupContent.setVisibility(View.VISIBLE);
+                if (mStage == Stage.NEW_FINGERPRINT_ENROLLED) {
+                    mPasswordDescriptionTextView.setVisibility(View.GONE);
+                    mNewFingerprintEnrolledTextView.setVisibility(View.VISIBLE);
+                    mUseFingerprintFutureCheckBox.setVisibility(View.VISIBLE);
+                }
                 break;
         }
     }
@@ -215,8 +250,9 @@ public class FingerprintAuthenticationDialogFragment extends DialogFragment
     /**
      * Enumeration to indicate which authentication method the user is trying to authenticate with.
      */
-    private enum Stage {
+    public enum Stage {
         FINGERPRINT,
+        NEW_FINGERPRINT_ENROLLED,
         PASSWORD
     }
 }
diff --git a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintModule.java b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintModule.java
index 16d5067ea..964e1f6d8 100644
--- a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintModule.java
+++ b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintModule.java
@@ -18,7 +18,10 @@ package com.example.android.fingerprintdialog;
 
 import android.app.KeyguardManager;
 import android.content.Context;
+import android.content.SharedPreferences;
 import android.hardware.fingerprint.FingerprintManager;
+import android.preference.PreferenceManager;
+import android.security.keystore.KeyProperties;
 import android.view.inputmethod.InputMethodManager;
 
 import java.security.KeyStore;
@@ -75,7 +78,7 @@ public class FingerprintModule {
     @Provides
     public KeyGenerator providesKeyGenerator() {
         try {
-            return KeyGenerator.getInstance("AES", "AndroidKeyStore");
+            return KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
         } catch (NoSuchAlgorithmException | NoSuchProviderException e) {
             throw new RuntimeException("Failed to get an instance of KeyGenerator", e);
         }
@@ -84,7 +87,9 @@ public class FingerprintModule {
     @Provides
     public Cipher providesCipher(KeyStore keyStore) {
         try {
-            return Cipher.getInstance("AES/CBC/PKCS7Padding");
+            return Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/"
+                    + KeyProperties.BLOCK_MODE_CBC + "/"
+                    + KeyProperties.ENCRYPTION_PADDING_PKCS7);
         } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
             throw new RuntimeException("Failed to get an instance of Cipher", e);
         }
@@ -94,4 +99,9 @@ public class FingerprintModule {
     public InputMethodManager providesInputMethodManager(Context context) {
         return (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
     }
+
+    @Provides
+    public SharedPreferences providesSharedPreferences(Context context) {
+        return PreferenceManager.getDefaultSharedPreferences(context);
+    }
 }
diff --git a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintUiHelper.java b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintUiHelper.java
index ab7570ca7..92fcdb1d0 100644
--- a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintUiHelper.java
+++ b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/FingerprintUiHelper.java
@@ -82,7 +82,8 @@ public class FingerprintUiHelper extends FingerprintManager.AuthenticationCallba
         }
         mCancellationSignal = new CancellationSignal();
         mSelfCancelled = false;
-        mFingerprintManager.authenticate(cryptoObject, mCancellationSignal, this, 0 /* flags */);
+        mFingerprintManager
+                .authenticate(cryptoObject, mCancellationSignal, 0 /* flags */, this, null);
         mIcon.setImageResource(R.drawable.ic_fp_40px);
     }
 
diff --git a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/MainActivity.java b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/MainActivity.java
index 9d09765eb..c954bfa7b 100644
--- a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/MainActivity.java
+++ b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/MainActivity.java
@@ -19,6 +19,8 @@ package com.example.android.fingerprintdialog;
 import android.Manifest;
 import android.app.Activity;
 import android.app.KeyguardManager;
+import android.content.Intent;
+import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.hardware.fingerprint.FingerprintManager;
 import android.os.Bundle;
@@ -27,6 +29,8 @@ import android.security.keystore.KeyPermanentlyInvalidatedException;
 import android.security.keystore.KeyProperties;
 import android.util.Base64;
 import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
@@ -60,23 +64,29 @@ public class MainActivity extends Activity {
     /** Alias for our key in the Android Key Store */
     private static final String KEY_NAME = "my_key";
 
+    private static final int FINGERPRINT_PERMISSION_REQUEST_CODE = 0;
+
     @Inject KeyguardManager mKeyguardManager;
+    @Inject FingerprintManager mFingerprintManager;
     @Inject FingerprintAuthenticationDialogFragment mFragment;
     @Inject KeyStore mKeyStore;
     @Inject KeyGenerator mKeyGenerator;
     @Inject Cipher mCipher;
+    @Inject SharedPreferences mSharedPreferences;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         ((InjectedApplication) getApplication()).inject(this);
 
-        requestPermissions(new String[]{Manifest.permission.USE_FINGERPRINT}, 0);
+        requestPermissions(new String[]{Manifest.permission.USE_FINGERPRINT},
+                FINGERPRINT_PERMISSION_REQUEST_CODE);
     }
 
     @Override
     public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] state) {
-        if (requestCode == 0 && state[0] == PackageManager.PERMISSION_GRANTED) {
+        if (requestCode == FINGERPRINT_PERMISSION_REQUEST_CODE
+                && state[0] == PackageManager.PERMISSION_GRANTED) {
             setContentView(R.layout.activity_main);
             Button purchaseButton = (Button) findViewById(R.id.purchase_button);
             if (!mKeyguardManager.isKeyguardSecure()) {
@@ -88,35 +98,71 @@ public class MainActivity extends Activity {
                 purchaseButton.setEnabled(false);
                 return;
             }
+            if (!mFingerprintManager.hasEnrolledFingerprints()) {
+                purchaseButton.setEnabled(false);
+                // This happens when no fingerprints are registered.
+                Toast.makeText(this,
+                        "Go to 'Settings -> Security -> Fingerprint' and register at least one fingerprint",
+                        Toast.LENGTH_LONG).show();
+                return;
+            }
             createKey();
+            purchaseButton.setEnabled(true);
             purchaseButton.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
-
-                    // Show the fingerprint dialog. The user has the option to use the fingerprint with
-                    // crypto, or you can fall back to using a server-side verified password.
-                    mFragment.setCryptoObject(new FingerprintManager.CryptoObject(mCipher));
-                    mFragment.show(getFragmentManager(), DIALOG_FRAGMENT_TAG);
+                    findViewById(R.id.confirmation_message).setVisibility(View.GONE);
+                    findViewById(R.id.encrypted_message).setVisibility(View.GONE);
+
+                    // Set up the crypto object for later. The object will be authenticated by use
+                    // of the fingerprint.
+                    if (initCipher()) {
+
+                        // Show the fingerprint dialog. The user has the option to use the fingerprint with
+                        // crypto, or you can fall back to using a server-side verified password.
+                        mFragment.setCryptoObject(new FingerprintManager.CryptoObject(mCipher));
+                        boolean useFingerprintPreference = mSharedPreferences
+                                .getBoolean(getString(R.string.use_fingerprint_to_authenticate_key),
+                                        true);
+                        if (useFingerprintPreference) {
+                            mFragment.setStage(
+                                    FingerprintAuthenticationDialogFragment.Stage.FINGERPRINT);
+                        } else {
+                            mFragment.setStage(
+                                    FingerprintAuthenticationDialogFragment.Stage.PASSWORD);
+                        }
+                        mFragment.show(getFragmentManager(), DIALOG_FRAGMENT_TAG);
+                    } else {
+                        // This happens if the lock screen has been disabled or or a fingerprint got
+                        // enrolled. Thus show the dialog to authenticate with their password first
+                        // and ask the user if they want to authenticate with fingerprints in the
+                        // future
+                        mFragment.setCryptoObject(new FingerprintManager.CryptoObject(mCipher));
+                        mFragment.setStage(
+                                FingerprintAuthenticationDialogFragment.Stage.NEW_FINGERPRINT_ENROLLED);
+                        mFragment.show(getFragmentManager(), DIALOG_FRAGMENT_TAG);
+                    }
                 }
             });
-
-            // Set up the crypto object for later. The object will be authenticated by use
-            // of the fingerprint.
-            initCipher();
         }
     }
 
-    private void initCipher() {
+    /**
+     * Initialize the {@link Cipher} instance with the created key in the {@link #createKey()}
+     * method.
+     *
+     * @return {@code true} if initialization is successful, {@code false} if the lock screen has
+     * been disabled or reset after the key was generated, or if a fingerprint got enrolled after
+     * the key was generated.
+     */
+    private boolean initCipher() {
         try {
             mKeyStore.load(null);
             SecretKey key = (SecretKey) mKeyStore.getKey(KEY_NAME, null);
             mCipher.init(Cipher.ENCRYPT_MODE, key);
+            return true;
         } catch (KeyPermanentlyInvalidatedException e) {
-            // This happens if the lock screen has been disabled or reset after the key was
-            // generated, or if a fingerprint got enrolled after the key was generated.
-            Toast.makeText(this, "Keys are invalidated after created. Retry the purchase\n"
-                            + e.getMessage(),
-                    Toast.LENGTH_LONG).show();
+            return false;
         } catch (KeyStoreException | CertificateException | UnrecoverableKeyException | IOException
                 | NoSuchAlgorithmException | InvalidKeyException e) {
             throw new RuntimeException("Failed to init Cipher", e);
@@ -124,7 +170,6 @@ public class MainActivity extends Activity {
     }
 
     public void onPurchased(boolean withFingerprint) {
-        findViewById(R.id.purchase_button).setVisibility(View.GONE);
         if (withFingerprint) {
             // If the user has authenticated with fingerprint, verify that using cryptography and
             // then show the confirmation message.
@@ -164,7 +209,7 @@ public class MainActivity extends Activity {
      * Creates a symmetric key in the Android Key Store which can only be used after the user has
      * authenticated with fingerprint.
      */
-    private void createKey() {
+    public void createKey() {
         // The enrolling flow for fingerprint. This is where you ask the user to set up fingerprint
         // for your flow. Use of keys is necessary if you need to know if the set of
         // enrolled fingerprints has changed.
@@ -187,4 +232,22 @@ public class MainActivity extends Activity {
             throw new RuntimeException(e);
         }
     }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.menu_main, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        int id = item.getItemId();
+
+        if (id == R.id.action_settings) {
+            Intent intent = new Intent(this, SettingsActivity.class);
+            startActivity(intent);
+            return true;
+        }
+        return super.onOptionsItemSelected(item);
+    }
 }
diff --git a/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/SettingsActivity.java b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/SettingsActivity.java
new file mode 100644
index 000000000..08b391140
--- /dev/null
+++ b/samples/browseable/FingerprintDialog/src/com.example.android.fingerprintdialog/SettingsActivity.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.example.android.fingerprintdialog;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.preference.PreferenceFragment;
+
+public class SettingsActivity extends Activity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        // Display the fragment as the main content.
+        getFragmentManager().beginTransaction().replace(android.R.id.content,
+                new SettingsFragment()).commit();
+    }
+
+    /**
+     * Fragment for settings.
+     */
+    public static class SettingsFragment extends PreferenceFragment {
+
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            super.onCreate(savedInstanceState);
+            addPreferencesFromResource(R.xml.preferences);
+        }
+    }
+}
+
+
diff --git a/samples/browseable/Geofencing/Wearable/src/com.example.android.wearable.geofencing/HomeListenerService.java b/samples/browseable/Geofencing/Wearable/src/com.example.android.wearable.geofencing/HomeListenerService.java
index 415fc46aa..251360c9e 100644
--- a/samples/browseable/Geofencing/Wearable/src/com.example.android.wearable.geofencing/HomeListenerService.java
+++ b/samples/browseable/Geofencing/Wearable/src/com.example.android.wearable.geofencing/HomeListenerService.java
@@ -79,7 +79,6 @@ public class HomeListenerService extends WearableListenerService {
                 postNotificationForGeofenceId(geofenceId, event.getDataItem().getUri());
             }
         }
-        dataEvents.close();
     }
 
     /**
diff --git a/samples/browseable/HdrViewfinder/AndroidManifest.xml b/samples/browseable/HdrViewfinder/AndroidManifest.xml
index 772b7dfdf..63066f6d4 100644
--- a/samples/browseable/HdrViewfinder/AndroidManifest.xml
+++ b/samples/browseable/HdrViewfinder/AndroidManifest.xml
@@ -20,10 +20,6 @@
     android:versionCode="1"
     android:versionName="1.0">
 
-    <uses-sdk
-        android:minSdkVersion="21"
-        android:targetSdkVersion="21"/>
-
     <uses-feature android:name="android.hardware.camera"/>
     <uses-feature
         android:name="android.hardware.camera.front"
@@ -31,8 +27,6 @@
 
     <uses-permission android:name="android.permission.CAMERA"/>
     <uses-permission android:name="android.permission.RECORD_AUDIO"/>
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
-    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
 
     <application
         android:allowBackup="true"
@@ -43,7 +37,8 @@
         <activity
             android:name=".HdrViewfinderActivity"
             android:label="@string/app_name"
-            android:screenOrientation="landscape">
+            android:screenOrientation="landscape"
+                android:theme="@style/Theme.AppCompat.Light">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>
diff --git a/samples/browseable/HdrViewfinder/res/layout/main.xml b/samples/browseable/HdrViewfinder/res/layout/main.xml
index 7507709e5..6fe56ef0f 100644
--- a/samples/browseable/HdrViewfinder/res/layout/main.xml
+++ b/samples/browseable/HdrViewfinder/res/layout/main.xml
@@ -15,13 +15,14 @@
      limitations under the License.
 -->
 <LinearLayout
-    android:id="@+id/panels"
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:custom="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/panels"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:orientation="horizontal">
+    android:orientation="horizontal"
+    tools:context="com.example.android.hdrviewfinder.HdrViewfinderActivity">
 
     <com.example.android.hdrviewfinder.FixedAspectSurfaceView
         android:id="@+id/preview"
@@ -36,7 +37,8 @@
         android:layout_width="0px"
         android:layout_height="match_parent"
         android:layout_weight="1"
-        android:orientation="vertical">
+        android:orientation="vertical"
+        android:layout_margin="5dp">
 
         <Button
             android:id="@+id/help_button"
diff --git a/samples/browseable/HdrViewfinder/res/values/strings.xml b/samples/browseable/HdrViewfinder/res/values/strings.xml
index 21838d549..d910ab1a1 100644
--- a/samples/browseable/HdrViewfinder/res/values/strings.xml
+++ b/samples/browseable/HdrViewfinder/res/values/strings.xml
@@ -50,10 +50,18 @@
 
     <string name="info">Info</string>
 
+    <string name="camera_permission_rationale">This sample app requires camera access in order to
+        demo the API.</string>
     <string name="camera_no_good">No back-facing sufficiently capable camera available!</string>
     <string name="camera_disabled">Camera is disabled by device policy</string>
     <string name="camera_disconnected">Camera was disconnected before it was opened</string>
     <string name="camera_error">Camera service reported an error</string>
     <string name="camera_unknown">Unknown camera error: %s</string>
+    <string name="camera_permission_denied_explanation">You\'ve denied a permission that the app
+        needs for core functionality. If you selected &quot;don\'t ask again&quot; in the past then
+        you need to use Settings to re-enable the permission.</string>
+
+    <string name="ok">OK</string>
+    <string name="settings">Settings</string>
 
 </resources>
diff --git a/samples/browseable/HdrViewfinder/src/com.example.android.hdrviewfinder/CameraOps.java b/samples/browseable/HdrViewfinder/src/com.example.android.hdrviewfinder/CameraOps.java
index 5769760b2..173ef08ee 100644
--- a/samples/browseable/HdrViewfinder/src/com.example.android.hdrviewfinder/CameraOps.java
+++ b/samples/browseable/HdrViewfinder/src/com.example.android.hdrviewfinder/CameraOps.java
@@ -78,7 +78,7 @@ public class CameraOps {
     }
 
     /**
-     * Open the first backfacing camera listed by the camera manager.
+     * Open the first back-facing camera listed by the camera manager.
      * Displays a dialog if it cannot open a camera.
      */
     public void openCamera(final String cameraId) {
diff --git a/samples/browseable/HdrViewfinder/src/com.example.android.hdrviewfinder/HdrViewfinderActivity.java b/samples/browseable/HdrViewfinder/src/com.example.android.hdrviewfinder/HdrViewfinderActivity.java
index 79f1bb61e..ca49ea0ba 100644
--- a/samples/browseable/HdrViewfinder/src/com.example.android.hdrviewfinder/HdrViewfinderActivity.java
+++ b/samples/browseable/HdrViewfinder/src/com.example.android.hdrviewfinder/HdrViewfinderActivity.java
@@ -16,7 +16,9 @@
 
 package com.example.android.hdrviewfinder;
 
-import android.app.Activity;
+import android.Manifest;
+import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.hardware.camera2.CameraAccessException;
 import android.hardware.camera2.CameraCaptureSession;
 import android.hardware.camera2.CameraCharacteristics;
@@ -26,10 +28,16 @@ import android.hardware.camera2.CaptureRequest;
 import android.hardware.camera2.CaptureResult;
 import android.hardware.camera2.TotalCaptureResult;
 import android.hardware.camera2.params.StreamConfigurationMap;
+import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
+import android.provider.Settings;
 import android.renderscript.RenderScript;
+import android.support.annotation.NonNull;
+import android.support.design.widget.Snackbar;
+import android.support.v4.app.ActivityCompat;
+import android.support.v7.app.AppCompatActivity;
 import android.util.Log;
 import android.util.Size;
 import android.view.GestureDetector;
@@ -76,19 +84,26 @@ import java.util.List;
  * Android {@link android.view.Surface} class, which allows for zero-copy transport of large
  * buffers between processes and subsystems.</p>
  */
-public class HdrViewfinderActivity extends Activity implements
+public class HdrViewfinderActivity extends AppCompatActivity implements
         SurfaceHolder.Callback, CameraOps.ErrorDisplayer, CameraOps.CameraReadyListener {
 
     private static final String TAG = "HdrViewfinderDemo";
 
     private static final String FRAGMENT_DIALOG = "dialog";
 
+    private static final int REQUEST_PERMISSIONS_REQUEST_CODE = 34;
+
     /**
      * View for the camera preview.
      */
     private FixedAspectSurfaceView mPreviewView;
 
     /**
+     * Root view of this activity.
+     */
+    private View rootView;
+
+    /**
      * This shows the current mode of the app.
      */
     private TextView mModeText;
@@ -132,6 +147,8 @@ public class HdrViewfinderActivity extends Activity implements
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
 
+        rootView = findViewById(R.id.panels);
+
         mPreviewView = (FixedAspectSurfaceView) findViewById(R.id.preview);
         mPreviewView.getHolder().addCallback(this);
         mPreviewView.setGestureListener(this, mViewListener);
@@ -146,23 +163,20 @@ public class HdrViewfinderActivity extends Activity implements
 
         mUiHandler = new Handler(Looper.getMainLooper());
 
-        mCameraManager = (CameraManager) getSystemService(CAMERA_SERVICE);
-        mCameraOps = new CameraOps(mCameraManager,
-                /*errorDisplayer*/ this,
-                /*readyListener*/ this,
-                /*readyHandler*/ mUiHandler);
-
-        mHdrRequests.add(null);
-        mHdrRequests.add(null);
-
         mRS = RenderScript.create(this);
+
+        // When permissions are revoked the app is restarted so onCreate is sufficient to check for
+        // permissions core to the Activity's functionality.
+        if (!checkCameraPermissions()) {
+            requestCameraPermissions();
+        } else {
+            findAndOpenCamera();
+        }
     }
 
     @Override
     protected void onResume() {
         super.onResume();
-
-        findAndOpenCamera();
     }
 
     @Override
@@ -170,7 +184,10 @@ public class HdrViewfinderActivity extends Activity implements
         super.onPause();
 
         // Wait until camera is closed to ensure the next application can open it
-        mCameraOps.closeCameraAndWait();
+        if (mCameraOps != null) {
+            mCameraOps.closeCameraAndWait();
+            mCameraOps = null;
+        }
     }
 
     @Override
@@ -232,7 +249,9 @@ public class HdrViewfinderActivity extends Activity implements
         }
     };
 
-    // Show help dialog
+    /**
+     * Show help dialogs.
+     */
     private View.OnClickListener mHelpButtonListener = new View.OnClickListener() {
         public void onClick(View v) {
             MessageDialogFragment.newInstance(R.string.help_text)
@@ -240,54 +259,176 @@ public class HdrViewfinderActivity extends Activity implements
         }
     };
 
-    private void findAndOpenCamera() {
+    /**
+     * Return the current state of the camera permissions.
+     */
+    private boolean checkCameraPermissions() {
+        int permissionState = ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA);
+
+        // Check if the Camera permission is already available.
+        if (permissionState != PackageManager.PERMISSION_GRANTED) {
+            // Camera permission has not been granted.
+            Log.i(TAG, "CAMERA permission has NOT been granted.");
+            return false;
+        } else {
+            // Camera permissions are available.
+            Log.i(TAG, "CAMERA permission has already been granted.");
+            return true;
+        }
+    }
 
-        String errorMessage = "Unknown error";
-        boolean foundCamera = false;
-        try {
-            // Find first back-facing camera that has necessary capability
-            String[] cameraIds = mCameraManager.getCameraIdList();
-            for (String id : cameraIds) {
-                CameraCharacteristics info = mCameraManager.getCameraCharacteristics(id);
-                int facing = info.get(CameraCharacteristics.LENS_FACING);
-
-                int level = info.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);
-                boolean hasFullLevel
-                        = (level == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_FULL);
-
-                int[] capabilities = info.get(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES);
-                int syncLatency = info.get(CameraCharacteristics.SYNC_MAX_LATENCY);
-                boolean hasManualControl = hasCapability(capabilities,
-                        CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES_MANUAL_SENSOR);
-                boolean hasEnoughCapability = hasManualControl &&
-                        syncLatency == CameraCharacteristics.SYNC_MAX_LATENCY_PER_FRAME_CONTROL;
-
-                // All these are guaranteed by
-                // CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_FULL, but checking for only
-                // the things we care about expands range of devices we can run on
-                // We want:
-                //  - Back-facing camera
-                //  - Manual sensor control
-                //  - Per-frame synchronization (so that exposure can be changed every frame)
-                if (facing == CameraCharacteristics.LENS_FACING_BACK &&
-                        (hasFullLevel || hasEnoughCapability)) {
-                    // Found suitable camera - get info, open, and set up outputs
-                    mCameraInfo = info;
-                    mCameraOps.openCamera(id);
-                    configureSurfaces();
-                    foundCamera = true;
-                    break;
-                }
-            }
-            if (!foundCamera) {
-                errorMessage = getString(R.string.camera_no_good);
+    /**
+     * Attempt to initialize the camera.
+     */
+    private void initializeCamera() {
+        mCameraManager = (CameraManager) getSystemService(CAMERA_SERVICE);
+        if (mCameraManager != null) {
+            mCameraOps = new CameraOps(mCameraManager,
+                /*errorDisplayer*/ this,
+                /*readyListener*/ this,
+                /*readyHandler*/ mUiHandler);
+
+            mHdrRequests.add(null);
+            mHdrRequests.add(null);
+        } else {
+            Log.e(TAG, "Couldn't initialize the camera");
+        }
+    }
+
+    private void requestCameraPermissions() {
+        boolean shouldProvideRationale =
+            ActivityCompat.shouldShowRequestPermissionRationale(this,
+                    Manifest.permission.CAMERA);
+
+        // Provide an additional rationale to the user. This would happen if the user denied the
+        // request previously, but didn't check the "Don't ask again" checkbox.
+        if (shouldProvideRationale) {
+            Log.i(TAG, "Displaying camera permission rationale to provide additional context.");
+            Snackbar.make(rootView, R.string.camera_permission_rationale, Snackbar
+                    .LENGTH_INDEFINITE)
+                    .setAction(R.string.ok, new View.OnClickListener() {
+                        @Override
+                        public void onClick(View view) {
+                            // Request Camera permission
+                            ActivityCompat.requestPermissions(HdrViewfinderActivity.this,
+                                    new String[]{Manifest.permission.CAMERA},
+                                    REQUEST_PERMISSIONS_REQUEST_CODE);
+                        }
+                    })
+                    .show();
+        } else {
+            Log.i(TAG, "Requesting camera permission");
+            // Request Camera permission. It's possible this can be auto answered if device policy
+            // sets the permission in a given state or the user denied the permission
+            // previously and checked "Never ask again".
+            ActivityCompat.requestPermissions(HdrViewfinderActivity.this,
+                    new String[]{Manifest.permission.CAMERA},
+                    REQUEST_PERMISSIONS_REQUEST_CODE);
+        }
+    }
+
+    /**
+     * Callback received when a permissions request has been completed.
+     */
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
+            @NonNull int[] grantResults) {
+        Log.i(TAG, "onRequestPermissionResult");
+        if (requestCode == REQUEST_PERMISSIONS_REQUEST_CODE) {
+            if (grantResults.length <= 0) {
+                // If user interaction was interrupted, the permission request is cancelled and you
+                // receive empty arrays.
+                Log.i(TAG, "User interaction was cancelled.");
+            } else if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                // Permission was granted.
+                findAndOpenCamera();
+            } else {
+                // Permission denied.
+
+                // In this Activity we've chosen to notify the user that they
+                // have rejected a core permission for the app since it makes the Activity useless.
+                // We're communicating this message in a Snackbar since this is a sample app, but
+                // core permissions would typically be best requested during a welcome-screen flow.
+
+                // Additionally, it is important to remember that a permission might have been
+                // rejected without asking the user for permission (device policy or "Never ask
+                // again" prompts). Therefore, a user interface affordance is typically implemented
+                // when permissions are denied. Otherwise, your app could appear unresponsive to
+                // touches or interactions which have required permissions.
+                Snackbar.make(rootView, R.string.camera_permission_denied_explanation, Snackbar
+                        .LENGTH_INDEFINITE)
+                        .setAction(R.string.settings, new View.OnClickListener() {
+                            @Override
+                            public void onClick(View view) {
+                                // Build intent that displays the App settings screen.
+                                Intent intent = new Intent();
+                                intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
+                                Uri uri = Uri.fromParts("package", BuildConfig.APPLICATION_ID, null);
+                                intent.setData(uri);
+                                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+                                startActivity(intent);
+                            }
+                        })
+                        .show();
             }
-        } catch (CameraAccessException e) {
-            errorMessage = getErrorString(e);
         }
+    }
 
-        if (!foundCamera) {
-            showErrorDialog(errorMessage);
+    private void findAndOpenCamera() {
+        boolean cameraPermissions = checkCameraPermissions();
+        if (cameraPermissions) {
+            String errorMessage = "Unknown error";
+            boolean foundCamera = false;
+            initializeCamera();
+            if (cameraPermissions && mCameraOps != null) {
+                try {
+                    // Find first back-facing camera that has necessary capability.
+                    String[] cameraIds = mCameraManager.getCameraIdList();
+                    for (String id : cameraIds) {
+                        CameraCharacteristics info = mCameraManager.getCameraCharacteristics(id);
+                        int facing = info.get(CameraCharacteristics.LENS_FACING);
+
+                        int level = info.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);
+                        boolean hasFullLevel
+                                = (level
+                                == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_FULL);
+
+                        int[] capabilities = info
+                                .get(CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES);
+                        int syncLatency = info.get(CameraCharacteristics.SYNC_MAX_LATENCY);
+                        boolean hasManualControl = hasCapability(capabilities,
+                                CameraCharacteristics.REQUEST_AVAILABLE_CAPABILITIES_MANUAL_SENSOR);
+                        boolean hasEnoughCapability = hasManualControl &&
+                                syncLatency
+                                        == CameraCharacteristics.SYNC_MAX_LATENCY_PER_FRAME_CONTROL;
+
+                        // All these are guaranteed by
+                        // CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_FULL, but checking
+                        // for only the things we care about expands range of devices we can run on.
+                        // We want:
+                        //  - Back-facing camera
+                        //  - Manual sensor control
+                        //  - Per-frame synchronization (so that exposure can be changed every frame)
+                        if (facing == CameraCharacteristics.LENS_FACING_BACK &&
+                                (hasFullLevel || hasEnoughCapability)) {
+                            // Found suitable camera - get info, open, and set up outputs
+                            mCameraInfo = info;
+                            mCameraOps.openCamera(id);
+                            configureSurfaces();
+                            foundCamera = true;
+                            break;
+                        }
+                    }
+                    if (!foundCamera) {
+                        errorMessage = getString(R.string.camera_no_good);
+                    }
+                } catch (CameraAccessException e) {
+                    errorMessage = getErrorString(e);
+                }
+                if (!foundCamera) {
+                    showErrorDialog(errorMessage);
+                }
+            }
         }
     }
 
@@ -299,23 +440,25 @@ public class HdrViewfinderActivity extends Activity implements
     }
 
     private void switchRenderMode(int direction) {
-        mRenderMode = (mRenderMode + direction) % 3;
+        if (mCameraOps != null) {
+            mRenderMode = (mRenderMode + direction) % 3;
 
-        mModeText.setText(getResources().getStringArray(R.array.mode_label_array)[mRenderMode]);
+            mModeText.setText(getResources().getStringArray(R.array.mode_label_array)[mRenderMode]);
 
-        if (mProcessor != null) {
-            mProcessor.setRenderMode(mRenderMode);
-        }
-        if (mRenderMode == ViewfinderProcessor.MODE_NORMAL) {
-            mCameraOps.setRepeatingRequest(mPreviewRequest,
-                    mCaptureCallback, mUiHandler);
-        } else {
-            setHdrBurst();
+            if (mProcessor != null) {
+                mProcessor.setRenderMode(mRenderMode);
+            }
+            if (mRenderMode == ViewfinderProcessor.MODE_NORMAL) {
+                mCameraOps.setRepeatingRequest(mPreviewRequest,
+                        mCaptureCallback, mUiHandler);
+            } else {
+                setHdrBurst();
+            }
         }
     }
 
     /**
-     * Configure the surfaceview and RS processing
+     * Configure the surfaceview and RS processing.
      */
     private void configureSurfaces() {
         // Find a good size for output - largest 16:9 aspect ratio that's less than 720p
diff --git a/samples/browseable/MessagingService/AndroidManifest.xml b/samples/browseable/MessagingService/AndroidManifest.xml
index f8a5850d1..955f8d4f4 100644
--- a/samples/browseable/MessagingService/AndroidManifest.xml
+++ b/samples/browseable/MessagingService/AndroidManifest.xml
@@ -37,13 +37,17 @@
         <service android:name=".MessagingService">
         </service>
 
-        <receiver android:name=".MessageReadReceiver">
+        <receiver
+            android:name=".MessageReadReceiver"
+            android:exported="false">
             <intent-filter>
                 <action android:name="com.example.android.messagingservice.ACTION_MESSAGE_READ"/>
             </intent-filter>
         </receiver>
 
-        <receiver android:name=".MessageReplyReceiver">
+        <receiver
+            android:name=".MessageReplyReceiver"
+            android:exported="false">
             <intent-filter>
                 <action android:name="com.example.android.messagingservice.ACTION_MESSAGE_REPLY"/>
             </intent-filter>
diff --git a/samples/browseable/MessagingService/res/layout-land/fragment_message_me.xml b/samples/browseable/MessagingService/res/layout-land/fragment_message_me.xml
index 6f4f88bac..0cfd1cf0d 100644
--- a/samples/browseable/MessagingService/res/layout-land/fragment_message_me.xml
+++ b/samples/browseable/MessagingService/res/layout-land/fragment_message_me.xml
@@ -21,7 +21,8 @@
               android:paddingBottom="@dimen/activity_vertical_margin"
               android:paddingLeft="@dimen/activity_horizontal_margin"
               android:paddingRight="@dimen/activity_horizontal_margin"
-              android:paddingTop="@dimen/activity_vertical_margin">
+              android:paddingTop="@dimen/activity_vertical_margin"
+              android:baselineAligned="false">
     <LinearLayout
         android:layout_width="0dp"
         android:layout_height="match_parent"
diff --git a/samples/browseable/MessagingService/res/layout/fragment_message_me.xml b/samples/browseable/MessagingService/res/layout/fragment_message_me.xml
index 29a8c441a..404bd4de9 100644
--- a/samples/browseable/MessagingService/res/layout/fragment_message_me.xml
+++ b/samples/browseable/MessagingService/res/layout/fragment_message_me.xml
@@ -14,7 +14,6 @@
   limitations under the License.
   -->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
diff --git a/samples/browseable/MessagingService/res/values/strings.xml b/samples/browseable/MessagingService/res/values/strings.xml
index 001b10eed..3f8390dfc 100644
--- a/samples/browseable/MessagingService/res/values/strings.xml
+++ b/samples/browseable/MessagingService/res/values/strings.xml
@@ -16,8 +16,6 @@
   -->
 <resources>
     <string name="app_name">Messaging Sample</string>
-    <string name="action_settings">Settings</string>
-    <string name="title">Messaging Sample</string>
     <string name="notification_reply">Reply by Voice</string>
     <string name="send_2_conversations">Send 2 conversations with 1 message</string>
     <string name="send_1_conversation">Send 1 conversation with 1 message</string>
diff --git a/samples/browseable/MessagingService/src/com.example.android.messagingservice/Conversations.java b/samples/browseable/MessagingService/src/com.example.android.messagingservice/Conversations.java
index 7425df499..88ef7aa5f 100644
--- a/samples/browseable/MessagingService/src/com.example.android.messagingservice/Conversations.java
+++ b/samples/browseable/MessagingService/src/com.example.android.messagingservice/Conversations.java
@@ -17,7 +17,6 @@
 package com.example.android.messagingservice;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.ThreadLocalRandom;
diff --git a/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessageLogger.java b/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessageLogger.java
index d1007b5ad..3459178d0 100644
--- a/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessageLogger.java
+++ b/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessageLogger.java
@@ -19,6 +19,7 @@ package com.example.android.messagingservice;
 import android.content.Context;
 import android.content.SharedPreferences;
 
+import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 
@@ -27,13 +28,13 @@ import java.util.Date;
  * and replies. Don't use this in a real world application. This logger is only
  * used for displaying the messages in the text view.
  */
-public class MessageLogger {
+class MessageLogger {
 
     private static final String PREF_MESSAGE = "MESSAGE_LOGGER";
-    private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+    private static final DateFormat DATE_FORMAT = SimpleDateFormat.getDateTimeInstance();
+    private static final String LINE_BREAKS = "\n\n";
 
     public static final String LOG_KEY = "message_data";
-    public static final String LINE_BREAKS = "\n\n";
 
     public static void logMessage(Context context, String message) {
         SharedPreferences prefs = getPrefs(context);
diff --git a/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessageReadReceiver.java b/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessageReadReceiver.java
index f28a3a778..63c244f86 100644
--- a/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessageReadReceiver.java
+++ b/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessageReadReceiver.java
@@ -16,7 +16,6 @@
 
 package com.example.android.messagingservice;
 
-import android.app.NotificationManager;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
@@ -35,8 +34,8 @@ public class MessageReadReceiver extends BroadcastReceiver {
         if (conversationId != -1) {
             Log.d(TAG, "Conversation " + conversationId + " was read");
             MessageLogger.logMessage(context, "Conversation " + conversationId + " was read.");
-            NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
-            notificationManager.cancel(conversationId);
+            NotificationManagerCompat.from(context)
+                    .cancel(conversationId);
         }
     }
 }
diff --git a/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessagingFragment.java b/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessagingFragment.java
index f8efcc0c7..703bc8083 100644
--- a/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessagingFragment.java
+++ b/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessagingFragment.java
@@ -51,7 +51,7 @@ public class MessagingFragment extends Fragment implements View.OnClickListener
     private Messenger mService;
     private boolean mBound;
 
-    private ServiceConnection mConnection = new ServiceConnection() {
+    private final ServiceConnection mConnection = new ServiceConnection() {
         @Override
         public void onServiceConnected(ComponentName componentName, IBinder service) {
             mService = new Messenger(service);
@@ -67,7 +67,7 @@ public class MessagingFragment extends Fragment implements View.OnClickListener
         }
     };
 
-    private SharedPreferences.OnSharedPreferenceChangeListener listener =
+    private final SharedPreferences.OnSharedPreferenceChangeListener listener =
             new SharedPreferences.OnSharedPreferenceChangeListener() {
         @Override
         public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
diff --git a/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessagingService.java b/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessagingService.java
index f5900610d..73199ed54 100644
--- a/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessagingService.java
+++ b/samples/browseable/MessagingService/src/com.example.android.messagingservice/MessagingService.java
@@ -31,41 +31,24 @@ import android.support.v4.app.NotificationManagerCompat;
 import android.support.v4.app.RemoteInput;
 import android.util.Log;
 
+import java.lang.ref.WeakReference;
 import java.util.Iterator;
 
 public class MessagingService extends Service {
     private static final String TAG = MessagingService.class.getSimpleName();
-
-    public static final String READ_ACTION =
+    private static final String EOL = "\n";
+    private static final String READ_ACTION =
             "com.example.android.messagingservice.ACTION_MESSAGE_READ";
+
     public static final String REPLY_ACTION =
             "com.example.android.messagingservice.ACTION_MESSAGE_REPLY";
     public static final String CONVERSATION_ID = "conversation_id";
     public static final String EXTRA_VOICE_REPLY = "extra_voice_reply";
     public static final int MSG_SEND_NOTIFICATION = 1;
-    public static final String EOL = "\n";
 
     private NotificationManagerCompat mNotificationManager;
 
-    private final Messenger mMessenger = new Messenger(new IncomingHandler());
-
-    /**
-     * Handler of incoming messages from clients.
-     */
-    class IncomingHandler extends Handler {
-        @Override
-        public void handleMessage(Message msg) {
-            switch (msg.what) {
-                case MSG_SEND_NOTIFICATION:
-                    int howManyConversations = msg.arg1 <= 0 ? 1 : msg.arg1;
-                    int messagesPerConv = msg.arg2 <= 0 ? 1 : msg.arg2;
-                    sendNotification(howManyConversations, messagesPerConv);
-                    break;
-                default:
-                    super.handleMessage(msg);
-            }
-        }
-    }
+    private final Messenger mMessenger = new Messenger(new IncomingHandler(this));
 
     @Override
     public void onCreate() {
@@ -79,18 +62,6 @@ public class MessagingService extends Service {
         return mMessenger.getBinder();
     }
 
-    @Override
-    public int onStartCommand(Intent intent, int flags, int startId) {
-        Log.d(TAG, "onStartCommand");
-        return START_STICKY;
-    }
-
-    @Override
-    public void onDestroy() {
-        super.onDestroy();
-        Log.d(TAG, "onDestroy");
-    }
-
     // Creates an intent that will be triggered when a message is marked as read.
     private Intent getMessageReadIntent(int id) {
         return new Intent()
@@ -171,4 +142,31 @@ public class MessagingService extends Service {
 
         mNotificationManager.notify(conversation.getConversationId(), builder.build());
     }
+
+    /**
+     * Handler for incoming messages from clients.
+     */
+    private static class IncomingHandler extends Handler {
+        private final WeakReference<MessagingService> mReference;
+
+        IncomingHandler(MessagingService service) {
+            mReference = new WeakReference<>(service);
+        }
+
+        @Override
+        public void handleMessage(Message msg) {
+            MessagingService service = mReference.get();
+            switch (msg.what) {
+                case MSG_SEND_NOTIFICATION:
+                    int howManyConversations = msg.arg1 <= 0 ? 1 : msg.arg1;
+                    int messagesPerConversation = msg.arg2 <= 0 ? 1 : msg.arg2;
+                    if (service != null) {
+                        service.sendNotification(howManyConversations, messagesPerConversation);
+                    }
+                    break;
+                default:
+                    super.handleMessage(msg);
+            }
+        }
+    }
 }
diff --git a/samples/browseable/Quiz/Application/src/com.example.android.wearable.quiz/MainActivity.java b/samples/browseable/Quiz/Application/src/com.example.android.wearable.quiz/MainActivity.java
index 1e589353c..de8eb7450 100644
--- a/samples/browseable/Quiz/Application/src/com.example.android.wearable.quiz/MainActivity.java
+++ b/samples/browseable/Quiz/Application/src/com.example.android.wearable.quiz/MainActivity.java
@@ -325,8 +325,8 @@ public class MainActivity extends Activity implements DataApi.DataListener,
 
     @Override
     public void onDataChanged(DataEventBuffer dataEvents) {
+        // Need to freeze the dataEvents so they will exist later on the UI thread
         final List<DataEvent> events = FreezableUtils.freezeIterable(dataEvents);
-        dataEvents.close();
         runOnUiThread(new Runnable() {
             @Override
             public void run() {
@@ -445,16 +445,17 @@ public class MainActivity extends Activity implements DataApi.DataListener,
                     .setResultCallback(new ResultCallback<DataItemBuffer>() {
                         @Override
                         public void onResult(DataItemBuffer result) {
-                            if (result.getStatus().isSuccess()) {
-                                List<DataItem> dataItemList = FreezableUtils.freezeIterable(result);
-                                result.close();
-                                resetDataItems(dataItemList);
-                            } else {
-                                if (Log.isLoggable(TAG, Log.DEBUG)) {
-                                    Log.d(TAG, "Reset quiz: failed to get Data Items to reset");
+                            try {
+                                if (result.getStatus().isSuccess()) {
+                                    resetDataItems(result);
+                                } else {
+                                    if (Log.isLoggable(TAG, Log.DEBUG)) {
+                                        Log.d(TAG, "Reset quiz: failed to get Data Items to reset");
+                                    }
                                 }
+                            } finally {
+                                result.release();
                             }
-                            result.close();
                         }
                     });
         } else {
@@ -467,7 +468,7 @@ public class MainActivity extends Activity implements DataApi.DataListener,
         mNumSkipped = 0;
     }
 
-    private void resetDataItems(List<DataItem> dataItemList) {
+    private void resetDataItems(DataItemBuffer dataItemList) {
         if (mGoogleApiClient.isConnected()) {
             for (final DataItem dataItem : dataItemList) {
                 final Uri dataItemUri = dataItem.getUri();
@@ -521,19 +522,23 @@ public class MainActivity extends Activity implements DataApi.DataListener,
                     .setResultCallback(new ResultCallback<DataItemBuffer>() {
                         @Override
                         public void onResult(DataItemBuffer result) {
-                            if (result.getStatus().isSuccess()) {
-                                List<Uri> dataItemUriList = new ArrayList<Uri>();
-                                for (final DataItem dataItem : result) {
-                                    dataItemUriList.add(dataItem.getUri());
-                                }
-                                result.close();
-                                deleteDataItems(dataItemUriList);
-                            } else {
-                                if (Log.isLoggable(TAG, Log.DEBUG)) {
-                                    Log.d(TAG, "Clear quiz: failed to get Data Items for deletion");
+                            try {
+                                if (result.getStatus().isSuccess()) {
+                                    List<Uri> dataItemUriList = new ArrayList<Uri>();
+                                    for (final DataItem dataItem : result) {
+                                        dataItemUriList.add(dataItem.getUri());
+                                    }
+                                    deleteDataItems(dataItemUriList);
+                                } else {
+                                    if (Log.isLoggable(TAG, Log.DEBUG)) {
+                                        Log.d(TAG, "Clear quiz: failed to get Data Items for "
+                                                + "deletion");
+
+                                    }
                                 }
+                            } finally {
+                                result.release();
                             }
-                            result.close();
                         }
                     });
         } else {
diff --git a/samples/browseable/Quiz/Wearable/src/com.example.android.wearable.quiz/QuizListenerService.java b/samples/browseable/Quiz/Wearable/src/com.example.android.wearable.quiz/QuizListenerService.java
index 95bedf0ac..5a4b90617 100644
--- a/samples/browseable/Quiz/Wearable/src/com.example.android.wearable.quiz/QuizListenerService.java
+++ b/samples/browseable/Quiz/Wearable/src/com.example.android.wearable.quiz/QuizListenerService.java
@@ -40,7 +40,6 @@ import android.util.Log;
 
 import com.google.android.gms.common.ConnectionResult;
 import com.google.android.gms.common.api.GoogleApiClient;
-import com.google.android.gms.common.data.FreezableUtils;
 import com.google.android.gms.wearable.DataEvent;
 import com.google.android.gms.wearable.DataEventBuffer;
 import com.google.android.gms.wearable.DataItem;
@@ -80,9 +79,6 @@ public class QuizListenerService extends WearableListenerService {
 
     @Override
     public void onDataChanged(DataEventBuffer dataEvents) {
-        final List<DataEvent> events = FreezableUtils.freezeIterable(dataEvents);
-        dataEvents.close();
-
         GoogleApiClient googleApiClient = new GoogleApiClient.Builder(this)
                 .addApi(Wearable.API)
                 .build();
@@ -94,7 +90,7 @@ public class QuizListenerService extends WearableListenerService {
             return;
         }
 
-        for (DataEvent event : events) {
+        for (DataEvent event : dataEvents) {
             if (event.getType() == DataEvent.TYPE_CHANGED) {
                 DataItem dataItem = event.getDataItem();
                 DataMap dataMap = DataMapItem.fromDataItem(dataItem).getDataMap();
diff --git a/samples/browseable/RuntimePermissions/res/values/strings.xml b/samples/browseable/RuntimePermissions/res/values/strings.xml
index 941f05900..82d7b719d 100644
--- a/samples/browseable/RuntimePermissions/res/values/strings.xml
+++ b/samples/browseable/RuntimePermissions/res/values/strings.xml
@@ -16,4 +16,6 @@
     <string name="permision_available_camera">Camera Permission has been granted. Preview can now be opened.</string>
     <string name="permision_available_contacts">Contacts Permissions have been granted. Contacts screen can now be opened.</string>
     <string name="permissions_not_granted">Permissions were not granted.</string>
-</resources>
\ No newline at end of file
+    <string name="permission_camera_rationale">Camera permission is needed to show the camera preview.</string>
+    <string name="permission_contacts_rationale">Contacts permissions are needed to demonstrate access to the contacts database.</string>
+</resources>
diff --git a/samples/browseable/RuntimePermissions/src/com.example.android.system.runtimepermissions/MainActivity.java b/samples/browseable/RuntimePermissions/src/com.example.android.system.runtimepermissions/MainActivity.java
index 43436aa5f..5f38bad8d 100644
--- a/samples/browseable/RuntimePermissions/src/com.example.android.system.runtimepermissions/MainActivity.java
+++ b/samples/browseable/RuntimePermissions/src/com.example.android.system.runtimepermissions/MainActivity.java
@@ -54,6 +54,10 @@ import android.widget.ViewAnimator;
  * {@link Activity#requestPermissions(String[], int)} and the return value checked in {@link
  * Activity#onRequestPermissionsResult(int, String[], int[])}.
  * <p>
+ * Before requesting permissions, {@link Activity#shouldShowRequestPermissionRationale(String)}
+ * should be called to provide the user with additional context for the use of permissions if they
+ * have been denied previously.
+ * <p>
  * If this sample is executed on a device running a platform version below M, all permissions
  * declared
  * in the Android manifest file are always granted at install time and cannot be requested at run
@@ -102,14 +106,26 @@ public class MainActivity extends SampleActivityBase {
         // BEGIN_INCLUDE(camera_permission)
         // Check if the Camera permission is already available.
         if (PermissionUtil.hasSelfPermission(this, Manifest.permission.CAMERA)) {
+            // Camera permissions is already available, show the camera preview.
             Log.i(TAG,
                     "CAMERA permission has already been granted. Displaying camera preview.");
-            // Camera permissions is already available, show the camera preview.
             showCameraPreview();
         } else {
+            // Camera permission has not been granted.
             Log.i(TAG, "CAMERA permission has NOT been granted. Requesting permission.");
-            // Camera permission has not been granted. Request it.
-            requestPermissions(new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);
+
+            // Provide an additional rationale to the user if the permission was not granted
+            // and the user would benefit from additional context for the use of the permission.
+            if (shouldShowRequestPermissionRationale(Manifest.permission.CAMERA)) {
+                Log.i(TAG,
+                        "Displaying camera permission rationale to provide additional context.");
+                Toast.makeText(this, R.string.permission_camera_rationale, Toast.LENGTH_SHORT)
+                        .show();
+            }
+
+            // Request Camera permission
+            requestPermissions(new String[]{Manifest.permission.CAMERA},
+                    REQUEST_CAMERA);
         }
         // END_INCLUDE(camera_permission)
 
@@ -128,7 +144,18 @@ public class MainActivity extends SampleActivityBase {
             // Contact permissions have been granted. Show the contacts fragment.
             showContactDetails();
         } else {
+            // Contacts permissions have not been granted.
             Log.i(TAG, "Contact permissions has NOT been granted. Requesting permission.");
+
+            // Provide an additional rationale to the user if the permission was not granted
+            // and the user would benefit from additional context for the use of the permission.
+            if (shouldShowRequestPermissionRationale(Manifest.permission.CAMERA)) {
+                Log.i(TAG,
+                        "Displaying contacts permission rationale to provide additional context.");
+                Toast.makeText(this, R.string.permission_contacts_rationale, Toast.LENGTH_SHORT)
+                        .show();
+            }
+
             // contact permissions has not been granted (read and write contacts). Request them.
             requestPermissions(PERMISSIONS_CONTACT, REQUEST_CONTACTS);
         }
diff --git a/samples/browseable/RuntimePermissions/src/com.example.android.system.runtimepermissions/camera/CameraPreviewFragment.java b/samples/browseable/RuntimePermissions/src/com.example.android.system.runtimepermissions/camera/CameraPreviewFragment.java
index d0938f672..871cf757a 100644
--- a/samples/browseable/RuntimePermissions/src/com.example.android.system.runtimepermissions/camera/CameraPreviewFragment.java
+++ b/samples/browseable/RuntimePermissions/src/com.example.android.system.runtimepermissions/camera/CameraPreviewFragment.java
@@ -61,8 +61,13 @@ public class CameraPreviewFragment extends Fragment {
 
         // Open an instance of the first camera and retrieve its info.
         mCamera = getCameraInstance(CAMERA_ID);
-        Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
-        Camera.getCameraInfo(CAMERA_ID, cameraInfo);
+        Camera.CameraInfo cameraInfo = null;
+
+        if (mCamera != null) {
+            // Get camera info only if the camera is available
+            cameraInfo = new Camera.CameraInfo();
+            Camera.getCameraInfo(CAMERA_ID, cameraInfo);
+        }
 
         if (mCamera == null || cameraInfo == null) {
             // Camera is not available, display error message
diff --git a/samples/browseable/RuntimePermissionsBasic/src/com.example.android.basicpermissions/MainActivity.java b/samples/browseable/RuntimePermissionsBasic/src/com.example.android.basicpermissions/MainActivity.java
index 36941ebb9..9fa646d7e 100644
--- a/samples/browseable/RuntimePermissionsBasic/src/com.example.android.basicpermissions/MainActivity.java
+++ b/samples/browseable/RuntimePermissionsBasic/src/com.example.android.basicpermissions/MainActivity.java
@@ -86,34 +86,41 @@ public class MainActivity extends Activity {
 
     private void showCameraPreview() {
         // BEGIN_INCLUDE(startCamera)
-        if (isMNC()) {
-            // On Android M and above, need to check if permission has been granted at runtime.
-            if (checkSelfPermission(Manifest.permission.CAMERA)
-                    == PackageManager.PERMISSION_GRANTED) {
-                // Permission is available, start camera preview
-                startCamera();
-                Toast.makeText(this,
-                        "Camera permission has already been granted. Starting preview.",
-                        Toast.LENGTH_SHORT).show();
-            } else {
-                // Permission has not been granted and must be requested.
-                Toast.makeText(this,
-                        "Permission is not available. Requesting camera permission.",
-                        Toast.LENGTH_SHORT).show();
-                requestPermissions(new String[]{Manifest.permission.CAMERA},
-                        PERMISSION_REQUEST_CAMERA);
-            }
-        } else {
-            /*
-             Below Android M all permissions have already been grated at install time and do not
-             need to verified or requested.
-             If a permission has been disabled in the system settings, the API will return
-             unavailable or empty data instead. */
+        if (!isMNC()) {
+            // Below Android M there is no need to check for runtime permissions
             Toast.makeText(this,
                     "Requested permissions are granted at install time below M and are always "
                             + "available at runtime.",
                     Toast.LENGTH_SHORT).show();
             startCamera();
+            return;
+        }
+
+        // Check if the Camera permission has been granted
+        if (checkSelfPermission(Manifest.permission.CAMERA)
+                != PackageManager.PERMISSION_GRANTED) {
+            // Permission has not been granted and must be requested.
+
+            if (shouldShowRequestPermissionRationale(
+                    Manifest.permission.CAMERA)) {
+                // Provide an additional rationale to the user if the permission was not granted
+                // and the user would benefit from additional context for the use of the permission.
+                Toast.makeText(this, "Camera access is required to display a camera preview.",
+                        Toast.LENGTH_SHORT).show();
+            }
+            Toast.makeText(this,
+                    "Permission is not available. Requesting camera permission.",
+                    Toast.LENGTH_SHORT).show();
+
+            // Request the permission. The result will be received in onRequestPermissionResult()
+            requestPermissions(new String[]{Manifest.permission.CAMERA},
+                    PERMISSION_REQUEST_CAMERA);
+        } else {
+            // Permission is already available, start camera preview
+            startCamera();
+            Toast.makeText(this,
+                    "Camera permission is available. Starting preview.",
+                    Toast.LENGTH_SHORT).show();
         }
         // END_INCLUDE(startCamera)
     }
diff --git a/samples/browseable/WatchFace/Wearable/res/values/color.xml b/samples/browseable/WatchFace/Wearable/res/values/color.xml
index 0da08ed8b..1370192da 100644
--- a/samples/browseable/WatchFace/Wearable/res/values/color.xml
+++ b/samples/browseable/WatchFace/Wearable/res/values/color.xml
@@ -14,6 +14,7 @@
  limitations under the License.
 -->
 <resources>
+    <color name="digital_date">#aaaaaa</color>
     <color name="digital_am_pm">#aaaaa0</color>
     <color name="digital_colons">#aaaaa0</color>
     <color name="config_activity_background">#ffffff</color>
diff --git a/samples/browseable/WatchFace/Wearable/res/values/dimens.xml b/samples/browseable/WatchFace/Wearable/res/values/dimens.xml
index 8f04e56de..aef847b08 100644
--- a/samples/browseable/WatchFace/Wearable/res/values/dimens.xml
+++ b/samples/browseable/WatchFace/Wearable/res/values/dimens.xml
@@ -16,11 +16,13 @@
 <resources>
     <dimen name="digital_text_size">40dp</dimen>
     <dimen name="digital_text_size_round">45dp</dimen>
+    <dimen name="digital_date_text_size">20dp</dimen>
     <dimen name="digital_am_pm_size">25dp</dimen>
     <dimen name="digital_am_pm_size_round">30dp</dimen>
     <dimen name="digital_x_offset">15dp</dimen>
     <dimen name="digital_x_offset_round">25dp</dimen>
-    <dimen name="digital_y_offset">90dp</dimen>
+    <dimen name="digital_y_offset">80dp</dimen>
+    <dimen name="digital_line_height">25dp</dimen>
     <dimen name="digital_config_color_picker_item_margin">32dp</dimen>
     <dimen name="content_padding_start">12dp</dimen>
 </resources>
diff --git a/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/AnalogWatchFaceService.java b/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/AnalogWatchFaceService.java
index 15c550f33..16194b151 100644
--- a/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/AnalogWatchFaceService.java
+++ b/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/AnalogWatchFaceService.java
@@ -213,6 +213,17 @@ public class AnalogWatchFaceService extends CanvasWatchFaceService {
         }
 
         @Override
+        public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
+            if (mBackgroundScaledBitmap == null
+                    || mBackgroundScaledBitmap.getWidth() != width
+                    || mBackgroundScaledBitmap.getHeight() != height) {
+                mBackgroundScaledBitmap = Bitmap.createScaledBitmap(mBackgroundBitmap,
+                        width, height, true /* filter */);
+            }
+            super.onSurfaceChanged(holder, format, width, height);
+        }
+
+        @Override
         public void onDraw(Canvas canvas, Rect bounds) {
             mCalendar.setTimeInMillis(System.currentTimeMillis());
 
@@ -220,12 +231,6 @@ public class AnalogWatchFaceService extends CanvasWatchFaceService {
             int height = bounds.height();
 
             // Draw the background, scaled to fit.
-            if (mBackgroundScaledBitmap == null
-                    || mBackgroundScaledBitmap.getWidth() != width
-                    || mBackgroundScaledBitmap.getHeight() != height) {
-                mBackgroundScaledBitmap = Bitmap.createScaledBitmap(mBackgroundBitmap,
-                        width, height, true /* filter */);
-            }
             canvas.drawBitmap(mBackgroundScaledBitmap, 0, 0, null);
 
             // Find the center. Ignore the window insets so that, on round watches with a
diff --git a/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/DigitalWatchFaceService.java b/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/DigitalWatchFaceService.java
index 0bc420d01..0a9eff2fe 100644
--- a/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/DigitalWatchFaceService.java
+++ b/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/DigitalWatchFaceService.java
@@ -46,7 +46,10 @@ import com.google.android.gms.wearable.DataMap;
 import com.google.android.gms.wearable.DataMapItem;
 import com.google.android.gms.wearable.Wearable;
 
+import java.text.SimpleDateFormat;
 import java.util.Calendar;
+import java.util.Date;
+import java.util.Locale;
 import java.util.TimeZone;
 import java.util.concurrent.TimeUnit;
 
@@ -123,16 +126,26 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
                 .addApi(Wearable.API)
                 .build();
 
-        final BroadcastReceiver mTimeZoneReceiver = new BroadcastReceiver() {
+        /**
+         * Handles time zone and locale changes.
+         */
+        final BroadcastReceiver mReceiver = new BroadcastReceiver() {
             @Override
             public void onReceive(Context context, Intent intent) {
                 mCalendar.setTimeZone(TimeZone.getDefault());
+                initFormats();
                 invalidate();
             }
         };
-        boolean mRegisteredTimeZoneReceiver = false;
+
+        /**
+         * Unregistering an unregistered receiver throws an exception. Keep track of the
+         * registration state to prevent that.
+         */
+        boolean mRegisteredReceiver = false;
 
         Paint mBackgroundPaint;
+        Paint mDatePaint;
         Paint mHourPaint;
         Paint mMinutePaint;
         Paint mSecondPaint;
@@ -140,10 +153,16 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
         Paint mColonPaint;
         float mColonWidth;
         boolean mMute;
+
         Calendar mCalendar;
+        Date mDate;
+        SimpleDateFormat mDayOfWeekFormat;
+        java.text.DateFormat mDateFormat;
+
         boolean mShouldDrawColons;
         float mXOffset;
         float mYOffset;
+        float mLineHeight;
         String mAmString;
         String mPmString;
         int mInteractiveBackgroundColor =
@@ -175,11 +194,13 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
                     .build());
             Resources resources = DigitalWatchFaceService.this.getResources();
             mYOffset = resources.getDimension(R.dimen.digital_y_offset);
+            mLineHeight = resources.getDimension(R.dimen.digital_line_height);
             mAmString = resources.getString(R.string.digital_am);
             mPmString = resources.getString(R.string.digital_pm);
 
             mBackgroundPaint = new Paint();
             mBackgroundPaint.setColor(mInteractiveBackgroundColor);
+            mDatePaint = createTextPaint(resources.getColor(R.color.digital_date));
             mHourPaint = createTextPaint(mInteractiveHourDigitsColor, BOLD_TYPEFACE);
             mMinutePaint = createTextPaint(mInteractiveMinuteDigitsColor);
             mSecondPaint = createTextPaint(mInteractiveSecondDigitsColor);
@@ -187,6 +208,8 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
             mColonPaint = createTextPaint(resources.getColor(R.color.digital_colons));
 
             mCalendar = Calendar.getInstance();
+            mDate = new Date();
+            initFormats();
         }
 
         @Override
@@ -219,8 +242,9 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
 
                 registerReceiver();
 
-                // Update time zone in case it changed while we weren't visible.
+                // Update time zone and date formats, in case they changed while we weren't visible.
                 mCalendar.setTimeZone(TimeZone.getDefault());
+                initFormats();
             } else {
                 unregisterReceiver();
 
@@ -235,21 +259,29 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
             updateTimer();
         }
 
+        private void initFormats() {
+            mDayOfWeekFormat = new SimpleDateFormat("EEEE", Locale.getDefault());
+            mDayOfWeekFormat.setCalendar(mCalendar);
+            mDateFormat = DateFormat.getDateFormat(DigitalWatchFaceService.this);
+            mDateFormat.setCalendar(mCalendar);
+        }
+
         private void registerReceiver() {
-            if (mRegisteredTimeZoneReceiver) {
+            if (mRegisteredReceiver) {
                 return;
             }
-            mRegisteredTimeZoneReceiver = true;
+            mRegisteredReceiver = true;
             IntentFilter filter = new IntentFilter(Intent.ACTION_TIMEZONE_CHANGED);
-            DigitalWatchFaceService.this.registerReceiver(mTimeZoneReceiver, filter);
+            filter.addAction(Intent.ACTION_LOCALE_CHANGED);
+            DigitalWatchFaceService.this.registerReceiver(mReceiver, filter);
         }
 
         private void unregisterReceiver() {
-            if (!mRegisteredTimeZoneReceiver) {
+            if (!mRegisteredReceiver) {
                 return;
             }
-            mRegisteredTimeZoneReceiver = false;
-            DigitalWatchFaceService.this.unregisterReceiver(mTimeZoneReceiver);
+            mRegisteredReceiver = false;
+            DigitalWatchFaceService.this.unregisterReceiver(mReceiver);
         }
 
         @Override
@@ -269,6 +301,7 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
             float amPmSize = resources.getDimension(isRound
                     ? R.dimen.digital_am_pm_size_round : R.dimen.digital_am_pm_size);
 
+            mDatePaint.setTextSize(resources.getDimension(R.dimen.digital_date_text_size));
             mHourPaint.setTextSize(textSize);
             mMinutePaint.setTextSize(textSize);
             mSecondPaint.setTextSize(textSize);
@@ -321,6 +354,7 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
 
             if (mLowBitAmbient) {
                 boolean antiAlias = !inAmbientMode;
+                mDatePaint.setAntiAlias(antiAlias);
                 mHourPaint.setAntiAlias(antiAlias);
                 mMinutePaint.setAntiAlias(antiAlias);
                 mSecondPaint.setAntiAlias(antiAlias);
@@ -335,7 +369,7 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
         }
 
         private void adjustPaintColorToCurrentMode(Paint paint, int interactiveColor,
-                int ambientColor) {
+                                                   int ambientColor) {
             paint.setColor(isInAmbientMode() ? ambientColor : interactiveColor);
         }
 
@@ -353,6 +387,7 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
             if (mMute != inMuteMode) {
                 mMute = inMuteMode;
                 int alpha = inMuteMode ? MUTE_ALPHA : NORMAL_ALPHA;
+                mDatePaint.setAlpha(alpha);
                 mHourPaint.setAlpha(alpha);
                 mMinutePaint.setAlpha(alpha);
                 mColonPaint.setAlpha(alpha);
@@ -409,7 +444,9 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
 
         @Override
         public void onDraw(Canvas canvas, Rect bounds) {
-            mCalendar.setTimeInMillis(System.currentTimeMillis());
+            long now = System.currentTimeMillis();
+            mCalendar.setTimeInMillis(now);
+            mDate.setTime(now);
             boolean is24Hour = DateFormat.is24HourFormat(DigitalWatchFaceService.this);
 
             // Show colons for the first half of each second so the colons blink on when the time
@@ -430,9 +467,6 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
                     hour = 12;
                 }
                 hourString = String.valueOf(hour);
-                if (hour < 10) {
-                    x += mHourPaint.measureText("0");
-                }
             }
             canvas.drawText(hourString, x, mYOffset, mHourPaint);
             x += mHourPaint.measureText(hourString);
@@ -463,6 +497,19 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
                 canvas.drawText(getAmPmString(
                         mCalendar.get(Calendar.AM_PM)), x, mYOffset, mAmPmPaint);
             }
+
+            // Only render the day of week and date if there is no peek card, so they do not bleed
+            // into each other in ambient mode.
+            if (getPeekCardPosition().isEmpty()) {
+                // Day of week
+                canvas.drawText(
+                        mDayOfWeekFormat.format(mDate),
+                        mXOffset, mYOffset + mLineHeight, mDatePaint);
+                // Date
+                canvas.drawText(
+                        mDateFormat.format(mDate),
+                        mXOffset, mYOffset + mLineHeight * 2, mDatePaint);
+            }
         }
 
         /**
@@ -522,27 +569,23 @@ public class DigitalWatchFaceService extends CanvasWatchFaceService {
 
         @Override // DataApi.DataListener
         public void onDataChanged(DataEventBuffer dataEvents) {
-            try {
-                for (DataEvent dataEvent : dataEvents) {
-                    if (dataEvent.getType() != DataEvent.TYPE_CHANGED) {
-                        continue;
-                    }
+            for (DataEvent dataEvent : dataEvents) {
+                if (dataEvent.getType() != DataEvent.TYPE_CHANGED) {
+                    continue;
+                }
 
-                    DataItem dataItem = dataEvent.getDataItem();
-                    if (!dataItem.getUri().getPath().equals(
-                            DigitalWatchFaceUtil.PATH_WITH_FEATURE)) {
-                        continue;
-                    }
+                DataItem dataItem = dataEvent.getDataItem();
+                if (!dataItem.getUri().getPath().equals(
+                        DigitalWatchFaceUtil.PATH_WITH_FEATURE)) {
+                    continue;
+                }
 
-                    DataMapItem dataMapItem = DataMapItem.fromDataItem(dataItem);
-                    DataMap config = dataMapItem.getDataMap();
-                    if (Log.isLoggable(TAG, Log.DEBUG)) {
-                        Log.d(TAG, "Config DataItem updated:" + config);
-                    }
-                    updateUiForConfigDataMap(config);
+                DataMapItem dataMapItem = DataMapItem.fromDataItem(dataItem);
+                DataMap config = dataMapItem.getDataMap();
+                if (Log.isLoggable(TAG, Log.DEBUG)) {
+                    Log.d(TAG, "Config DataItem updated:" + config);
                 }
-            } finally {
-                dataEvents.close();
+                updateUiForConfigDataMap(config);
             }
         }
 
diff --git a/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/SweepWatchFaceService.java b/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/SweepWatchFaceService.java
index 193f29a71..d547f1ce8 100644
--- a/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/SweepWatchFaceService.java
+++ b/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/SweepWatchFaceService.java
@@ -171,6 +171,17 @@ public class SweepWatchFaceService extends CanvasWatchFaceService {
         }
 
         @Override
+        public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
+            if (mBackgroundScaledBitmap == null
+                    || mBackgroundScaledBitmap.getWidth() != width
+                    || mBackgroundScaledBitmap.getHeight() != height) {
+                mBackgroundScaledBitmap = Bitmap.createScaledBitmap(mBackgroundBitmap,
+                        width, height, true /* filter */);
+            }
+            super.onSurfaceChanged(holder, format, width, height);
+        }
+
+        @Override
         public void onDraw(Canvas canvas, Rect bounds) {
             if (Log.isLoggable(TAG, Log.VERBOSE)) {
                 Log.v(TAG, "onDraw");
@@ -182,12 +193,6 @@ public class SweepWatchFaceService extends CanvasWatchFaceService {
             int height = bounds.height();
 
             // Draw the background, scaled to fit.
-            if (mBackgroundScaledBitmap == null
-                    || mBackgroundScaledBitmap.getWidth() != width
-                    || mBackgroundScaledBitmap.getHeight() != height) {
-                mBackgroundScaledBitmap = Bitmap.createScaledBitmap(mBackgroundBitmap,
-                        width, height, true /* filter */);
-            }
             canvas.drawBitmap(mBackgroundScaledBitmap, 0, 0, null);
 
             // Find the center. Ignore the window insets so that, on round watches with a
diff --git a/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/TiltWatchFaceService.java b/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/TiltWatchFaceService.java
index ffb0b6c29..879473c92 100644
--- a/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/TiltWatchFaceService.java
+++ b/samples/browseable/WatchFace/Wearable/src/com.example.android.wearable.watchface/TiltWatchFaceService.java
@@ -45,7 +45,7 @@ public class TiltWatchFaceService extends Gles2WatchFaceService {
     private static final long FPS = 60;
 
     /** Z distance from the camera to the watchface. */
-    private static final float EYE_Z = 2.3f;
+    private static final float EYE_Z = -2.3f;
 
     /** How long each frame is displayed at expected frame rate. */
     private static final long FRAME_PERIOD_MS = TimeUnit.SECONDS.toMillis(1) / FPS;
diff --git a/samples/browseable/XYZTouristAttractions/Application/res/layout/fragment_detail.xml b/samples/browseable/XYZTouristAttractions/Application/res/layout/fragment_detail.xml
index dffeb4edb..6e280fd17 100644
--- a/samples/browseable/XYZTouristAttractions/Application/res/layout/fragment_detail.xml
+++ b/samples/browseable/XYZTouristAttractions/Application/res/layout/fragment_detail.xml
@@ -16,67 +16,86 @@
   limitations under the License.
   -->
 
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:orientation="vertical"
+<android.support.design.widget.CoordinatorLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:weightSum="100">
-
-    <ImageView
-        android:id="@+id/imageView"
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="50"
-        android:scaleType="centerCrop"
-        android:transitionName="image" />
+    android:layout_height="match_parent">
 
     <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:background="?colorPrimary"
         android:orientation="vertical"
-        android:paddingStart="@dimen/keyline2"
-        android:paddingEnd="@dimen/keyline3"
-        android:paddingTop="@dimen/standard_margin"
-        android:paddingBottom="@dimen/standard_margin"
-        android:elevation="2dp">
-
-        <TextView
-            android:id="@+id/nameTextView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:weightSum="100">
+
+        <ImageView
+            android:id="@+id/imageView"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:maxLines="2"
-            android:ellipsize="end"
-            android:textIsSelectable="true"
-            style="@style/TextAppearance.AppCompat.Title.Inverse"
-            android:transitionName="title" />
-
-        <TextView
-            android:id="@+id/distanceTextView"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            style="@style/TextAppearance.AppCompat.Subhead.Inverse" />
+            android:layout_height="0dp"
+            android:layout_weight="50"
+            android:scaleType="centerCrop"
+            android:transitionName="image" />
 
-    </LinearLayout>
-    
-    <ScrollView
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="50"
-        android:paddingTop="@dimen/standard_margin"
-        android:paddingBottom="@dimen/standard_margin"
-        android:scrollbarStyle="outsideOverlay"
-        android:clipToPadding="false">
-
-        <TextView
-            android:id="@+id/descriptionTextView"
-            android:layout_height="wrap_content"
+        <LinearLayout
+            android:id="@+id/textLayout"
             android:layout_width="match_parent"
-            android:textIsSelectable="true"
-            style="@style/TextAppearance.AppCompat.Body1"
+            android:layout_height="wrap_content"
+            android:background="?colorPrimary"
+            android:orientation="vertical"
             android:paddingStart="@dimen/keyline2"
-            android:paddingEnd="@dimen/keyline3" />
+            android:paddingEnd="@dimen/keyline3"
+            android:paddingTop="@dimen/standard_margin"
+            android:paddingBottom="@dimen/standard_margin"
+            android:elevation="2dp">
+
+            <TextView
+                android:id="@+id/nameTextView"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:maxLines="2"
+                android:ellipsize="end"
+                android:textIsSelectable="true"
+                style="@style/TextAppearance.AppCompat.Title.Inverse" />
+
+            <TextView
+                android:id="@+id/distanceTextView"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                style="@style/TextAppearance.AppCompat.Subhead.Inverse" />
+
+        </LinearLayout>
+
+        <ScrollView
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="50"
+            android:paddingTop="@dimen/standard_margin"
+            android:paddingBottom="@dimen/standard_margin"
+            android:scrollbarStyle="outsideOverlay"
+            android:clipToPadding="false">
 
-    </ScrollView>
+            <TextView
+                android:id="@+id/descriptionTextView"
+                android:layout_height="wrap_content"
+                android:layout_width="match_parent"
+                android:textIsSelectable="true"
+                style="@style/TextAppearance.AppCompat.Body1"
+                android:paddingStart="@dimen/keyline2"
+                android:paddingEnd="@dimen/keyline3" />
+
+        </ScrollView>
+
+    </LinearLayout>
+
+    <android.support.design.widget.FloatingActionButton
+        android:id="@+id/mapFab"
+        android:layout_height="wrap_content"
+        android:layout_width="wrap_content"
+        android:src="@drawable/ic_action_map"
+        app:layout_anchor="@id/textLayout"
+        app:layout_anchorGravity="bottom|start"
+        app:rippleColor="@color/colorFabRipple"
+        android:layout_marginStart="@dimen/fab_margin"
+        android:clickable="true" />
 
-</LinearLayout>
\ No newline at end of file
+</android.support.design.widget.CoordinatorLayout>
\ No newline at end of file
diff --git a/samples/browseable/XYZTouristAttractions/Application/res/layout/list_row.xml b/samples/browseable/XYZTouristAttractions/Application/res/layout/list_row.xml
index 25f55d04c..b2cef57af 100644
--- a/samples/browseable/XYZTouristAttractions/Application/res/layout/list_row.xml
+++ b/samples/browseable/XYZTouristAttractions/Application/res/layout/list_row.xml
@@ -49,21 +49,20 @@
             android:id="@android:id/text1"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:layout_toRightOf="@android:id/icon"
+            android:layout_toEndOf="@android:id/icon"
             android:paddingTop="@dimen/small_margin"
             android:paddingLeft="@dimen/small_margin"
             android:paddingRight="@dimen/small_margin"
             android:maxLines="1"
             android:ellipsize="end"
             style="?android:textAppearanceMedium"
-            tools:text="Title 1"
-            android:transitionName="image" />
+            tools:text="Title 1" />
 
         <TextView
             android:id="@android:id/text2"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:layout_toRightOf="@android:id/icon"
+            android:layout_toEndOf="@android:id/icon"
             android:layout_below="@android:id/text1"
             android:padding="@dimen/small_margin"
             android:ellipsize="end"
diff --git a/samples/browseable/XYZTouristAttractions/Application/res/transition-v21/shared_move.xml b/samples/browseable/XYZTouristAttractions/Application/res/transition-v21/shared_move.xml
new file mode 100644
index 000000000..3debfa039
--- /dev/null
+++ b/samples/browseable/XYZTouristAttractions/Application/res/transition-v21/shared_move.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2014 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
+    android:startDelay="@android:integer/config_shortAnimTime">
+
+    <changeBounds>
+        <arcMotion />
+    </changeBounds>
+    <changeTransform/>
+    <changeClipBounds/>
+    <changeImageTransform/>
+
+</transitionSet>
diff --git a/samples/browseable/XYZTouristAttractions/Application/res/transition-v21/explode.xml b/samples/browseable/XYZTouristAttractions/Application/res/transition-v21/window_enter.xml
index 5dfa7179d..619ffdf0e 100644
--- a/samples/browseable/XYZTouristAttractions/Application/res/transition-v21/explode.xml
+++ b/samples/browseable/XYZTouristAttractions/Application/res/transition-v21/window_enter.xml
@@ -14,7 +14,8 @@
   See the License for the specific language governing permissions and
   limitations under the License.
   -->
-<transitionSet xmlns:android="http://schemas.android.com/apk/res/android">
+<transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
+    android:transitionOrdering="sequential">
 
     <explode>
         <targets>
@@ -25,4 +26,11 @@
         </targets>
     </explode>
 
+    <transition class="com.example.android.xyztouristattractions.ui.ScaleTransition"
+        android:interpolator="@android:interpolator/overshoot">
+        <targets>
+            <target android:targetId="@id/mapFab" />
+        </targets>
+    </transition>
+
 </transitionSet>
\ No newline at end of file
diff --git a/samples/browseable/XYZTouristAttractions/Application/res/transition-v21/window_return.xml b/samples/browseable/XYZTouristAttractions/Application/res/transition-v21/window_return.xml
new file mode 100644
index 000000000..0dae377c4
--- /dev/null
+++ b/samples/browseable/XYZTouristAttractions/Application/res/transition-v21/window_return.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright 2015 Google Inc. All rights reserved.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+<transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
+    android:transitionOrdering="sequential">
+
+    <transition class="com.example.android.xyztouristattractions.ui.ScaleTransition"
+        android:interpolator="@android:interpolator/fast_out_linear_in"
+        android:duration="@android:integer/config_shortAnimTime">
+        <targets>
+            <target android:targetId="@id/mapFab" />
+        </targets>
+    </transition>
+
+    <explode>
+        <targets>
+            <target android:targetClass="android.widget.TextView" />
+            <target android:targetClass="android.widget.FrameLayout" />
+            <target android:targetClass="android.widget.LinearLayout" />
+            <target android:targetClass="android.widget.ImageView" />
+            <target android:excludeId="@id/mapFab" />
+        </targets>
+    </explode>
+
+</transitionSet>
\ No newline at end of file
diff --git a/samples/browseable/XYZTouristAttractions/Application/res/menu/detail.xml b/samples/browseable/XYZTouristAttractions/Application/res/values-sw400dp-v21/dimens.xml
index aeb5c9860..ce539e497 100644
--- a/samples/browseable/XYZTouristAttractions/Application/res/menu/detail.xml
+++ b/samples/browseable/XYZTouristAttractions/Application/res/values-sw400dp-v21/dimens.xml
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
 <!--
   Copyright 2015 Google Inc. All rights reserved.
 
@@ -14,15 +15,8 @@
   limitations under the License.
   -->
 
-<menu xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    tools:context=".MainActivity" >
+<resources>
 
-    <item android:id="@+id/map"
-        android:title="@string/action_map"
-        android:orderInCategory="100"
-        android:icon="@drawable/ic_action_map"
-        app:showAsAction="ifRoom" />
+    <dimen name="fab_margin">12dp</dimen>
 
-</menu>
+</resources>
\ No newline at end of file
diff --git a/samples/browseable/XYZTouristAttractions/Application/res/values-sw400dp/dimens.xml b/samples/browseable/XYZTouristAttractions/Application/res/values-sw400dp/dimens.xml
index ad90eaaf8..701be7d64 100644
--- a/samples/browseable/XYZTouristAttractions/Application/res/values-sw400dp/dimens.xml
+++ b/samples/browseable/XYZTouristAttractions/Application/res/values-sw400dp/dimens.xml
@@ -20,5 +20,6 @@
     <dimen name="small_margin">12dp</dimen>
     <dimen name="tiny_margin">8dp</dimen>
     <dimen name="image_size">140dp</dimen>
+    <dimen name="fab_margin">0dp</dimen>
 
 </resources>
diff --git a/samples/browseable/XYZTouristAttractions/Application/res/values-v21/dimens.xml b/samples/browseable/XYZTouristAttractions/Application/res/values-v21/dimens.xml
new file mode 100644
index 000000000..2704c4532
--- /dev/null
+++ b/samples/browseable/XYZTouristAttractions/Application/res/values-v21/dimens.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright 2015 Google Inc. All rights reserved.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<resources>
+
+    <dimen name="fab_margin">8dp</dimen>
+
+</resources>
\ No newline at end of file
diff --git a/samples/browseable/XYZTouristAttractions/Application/res/values-v21/styles.xml b/samples/browseable/XYZTouristAttractions/Application/res/values-v21/styles.xml
index 319d66497..d1221c599 100644
--- a/samples/browseable/XYZTouristAttractions/Application/res/values-v21/styles.xml
+++ b/samples/browseable/XYZTouristAttractions/Application/res/values-v21/styles.xml
@@ -21,8 +21,10 @@
         <item name="android:windowActivityTransitions">true</item>
         <item name="android:windowExitTransition">@transition/fade</item>
         <item name="android:windowReenterTransition">@transition/fade</item>
-        <item name="android:windowEnterTransition">@transition/explode</item>
-        <item name="android:windowReturnTransition">@transition/explode</item>
+        <item name="android:windowEnterTransition">@transition/window_enter</item>
+        <item name="android:windowReturnTransition">@transition/window_return</item>
+        <item name="android:windowSharedElementEnterTransition">@transition/shared_move</item>
+        <item name="android:windowSharedElementExitTransition">@transition/shared_move</item>
         <item name="android:windowAllowEnterTransitionOverlap">false</item>
         <item name="android:windowAllowReturnTransitionOverlap">false</item>
         <item name="android:windowSharedElementsUseOverlay">false</item>
diff --git a/samples/browseable/XYZTouristAttractions/Application/res/values/dimens.xml b/samples/browseable/XYZTouristAttractions/Application/res/values/dimens.xml
index 03acfeff1..9cfc82534 100644
--- a/samples/browseable/XYZTouristAttractions/Application/res/values/dimens.xml
+++ b/samples/browseable/XYZTouristAttractions/Application/res/values/dimens.xml
@@ -21,6 +21,7 @@
     <dimen name="small_margin">8dp</dimen>
     <dimen name="tiny_margin">4dp</dimen>
     <dimen name="image_size">120dp</dimen>
+    <dimen name="fab_margin">-8dp</dimen>
     <item type="dimen" name="keyline1">@dimen/standard_margin</item>
     <dimen name="keyline2">72dp</dimen>
     <item type="dimen" name="keyline3">@dimen/standard_margin</item>
diff --git a/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/AttractionListFragment.java b/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/AttractionListFragment.java
index 0f1bc8bfa..28f912743 100644
--- a/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/AttractionListFragment.java
+++ b/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/AttractionListFragment.java
@@ -216,7 +216,7 @@ public class AttractionListFragment extends Fragment {
 
         @Override
         public void onClick(View v) {
-            mItemClickListener.onItemClick(v, getPosition());
+            mItemClickListener.onItemClick(v, getAdapterPosition());
         }
     }
 
diff --git a/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/DetailFragment.java b/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/DetailFragment.java
index 4d21009a3..1ab7326dd 100644
--- a/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/DetailFragment.java
+++ b/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/DetailFragment.java
@@ -21,12 +21,11 @@ import android.content.Intent;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
+import android.support.design.widget.FloatingActionButton;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.NavUtils;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
-import android.view.Menu;
-import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
@@ -83,6 +82,7 @@ public class DetailFragment extends Fragment {
         TextView descTextView = (TextView) view.findViewById(R.id.descriptionTextView);
         TextView distanceTextView = (TextView) view.findViewById(R.id.distanceTextView);
         ImageView imageView = (ImageView) view.findViewById(R.id.imageView);
+        FloatingActionButton mapFab = (FloatingActionButton) view.findViewById(R.id.mapFab);
 
         LatLng location = Utils.getLocation(getActivity());
         String distance = Utils.formatDistanceBetween(location, mAttraction.location);
@@ -102,13 +102,18 @@ public class DetailFragment extends Fragment {
                 .placeholder(R.color.lighter_gray)
                 .override(imageSize, imageSize)
                 .into(imageView);
-        return view;
-    }
 
-    @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
-        inflater.inflate(R.menu.detail, menu);
-        super.onCreateOptionsMenu(menu, inflater);
+        mapFab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(Intent.ACTION_VIEW);
+                intent.setData(Uri.parse(Constants.MAPS_INTENT_URI +
+                        Uri.encode(mAttraction.name + ", " + mAttraction.city)));
+                startActivity(intent);
+            }
+        });
+
+        return view;
     }
 
     @Override
@@ -139,12 +144,6 @@ public class DetailFragment extends Fragment {
 
                 // Otherwise let the system handle navigating "up"
                 return false;
-            case R.id.map:
-                Intent intent = new Intent(Intent.ACTION_VIEW);
-                intent.setData(Uri.parse(Constants.MAPS_INTENT_URI +
-                        Uri.encode(mAttraction.name + ", " + mAttraction.city)));
-                startActivity(intent);
-                return true;
         }
         return super.onOptionsItemSelected(item);
     }
diff --git a/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/ScaleTransition.java b/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/ScaleTransition.java
new file mode 100644
index 000000000..a7e4b2e7e
--- /dev/null
+++ b/samples/browseable/XYZTouristAttractions/Application/src/com.example.android.xyztouristattractions/ui/ScaleTransition.java
@@ -0,0 +1,46 @@
+package com.example.android.xyztouristattractions.ui;
+
+import android.animation.Animator;
+import android.animation.ObjectAnimator;
+import android.animation.PropertyValuesHolder;
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.os.Build;
+import android.transition.TransitionValues;
+import android.transition.Visibility;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
+
+/**
+ * A simple scale transition class to allow an element to scale in or out.
+ * This is used by the floating action button on the attraction detail screen
+ * when it appears and disappears during the Activity transitions.
+ */
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+public class ScaleTransition extends Visibility {
+
+    public ScaleTransition(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public Animator createAnimation(View view, float startScale, float endScale) {
+        view.setScaleX(startScale);
+        view.setScaleY(startScale);
+        PropertyValuesHolder holderX = PropertyValuesHolder.ofFloat("scaleX", startScale, endScale);
+        PropertyValuesHolder holderY = PropertyValuesHolder.ofFloat("scaleY", startScale, endScale);
+        return ObjectAnimator.ofPropertyValuesHolder(view, holderX, holderY);
+    }
+
+    @Override
+    public Animator onAppear(ViewGroup sceneRoot, View view, TransitionValues startValues,
+                             TransitionValues endValues) {
+        return createAnimation(view, 0, 1);
+    }
+
+    @Override
+    public Animator onDisappear(ViewGroup sceneRoot, View view, TransitionValues startValues,
+                                TransitionValues endValues) {
+        return createAnimation(view, 1, 0);
+    }
+}
\ No newline at end of file
diff --git a/samples/browseable/XYZTouristAttractions/Shared/res/values/colors.xml b/samples/browseable/XYZTouristAttractions/Shared/res/values/colors.xml
index 73c2b6c40..2260336da 100644
--- a/samples/browseable/XYZTouristAttractions/Shared/res/values/colors.xml
+++ b/samples/browseable/XYZTouristAttractions/Shared/res/values/colors.xml
@@ -20,5 +20,6 @@
     <color name="colorPrimary">#4e6cef</color>
     <color name="colorPrimaryDark">#2a36b1</color>
     <color name="colorAccent">#ff7043</color>
+    <color name="colorFabRipple">#D84315</color>
 
 </resources>
\ No newline at end of file
diff --git a/samples/browseable/XYZTouristAttractions/Wearable/AndroidManifest.xml b/samples/browseable/XYZTouristAttractions/Wearable/AndroidManifest.xml
index 24328b36e..80d0c920f 100644
--- a/samples/browseable/XYZTouristAttractions/Wearable/AndroidManifest.xml
+++ b/samples/browseable/XYZTouristAttractions/Wearable/AndroidManifest.xml
@@ -22,7 +22,7 @@
 
     <uses-sdk
         android:minSdkVersion="21"
-        android:targetSdkVersion="21" />
+        android:targetSdkVersion="22" />
 
     <application
         android:allowBackup="true"
@@ -32,9 +32,6 @@
 
         <activity
             android:name=".ui.AttractionsActivity"
-            android:exported="true"
-            android:allowEmbedded="true"
-            android:taskAffinity=""
             android:label="@string/app_name" />
 
         <activity
diff --git a/samples/browseable/XYZTouristAttractions/Wearable/src/com.example.android.xyztouristattractions/service/ListenerService.java b/samples/browseable/XYZTouristAttractions/Wearable/src/com.example.android.xyztouristattractions/service/ListenerService.java
index 3908414d7..d2282511d 100644
--- a/samples/browseable/XYZTouristAttractions/Wearable/src/com.example.android.xyztouristattractions/service/ListenerService.java
+++ b/samples/browseable/XYZTouristAttractions/Wearable/src/com.example.android.xyztouristattractions/service/ListenerService.java
@@ -30,7 +30,6 @@ import com.example.android.xyztouristattractions.common.Utils;
 import com.example.android.xyztouristattractions.ui.AttractionsActivity;
 import com.google.android.gms.common.ConnectionResult;
 import com.google.android.gms.common.api.GoogleApiClient;
-import com.google.android.gms.common.data.FreezableUtils;
 import com.google.android.gms.wearable.DataEvent;
 import com.google.android.gms.wearable.DataEventBuffer;
 import com.google.android.gms.wearable.DataMap;
@@ -54,9 +53,7 @@ public class ListenerService extends WearableListenerService {
     public void onDataChanged(DataEventBuffer dataEvents) {
         Log.d(TAG, "onDataChanged: " + dataEvents);
 
-        final List<DataEvent> events = FreezableUtils.freezeIterable(dataEvents);
-
-        for (DataEvent event : events) {
+        for (DataEvent event : dataEvents) {
             if (event.getType() == DataEvent.TYPE_CHANGED
                     && event.getDataItem() != null
                     && Constants.ATTRACTION_PATH.equals(event.getDataItem().getUri().getPath())) {