Refactor nfc preference controller

- Remove BaseNfcPreferenceController.
- NfcPreferenceController inherit from TogglePreferenceController.
- AndroidBeamPreferenceController inherit from BasePreferenceController.
- Override getIntentFilter in NfcPreferenceController to listen changes.
- Add an API (hasAsyncUpdate) into BasePreferenceController to
distinguish the setting which is updated asynchronously.

Change-Id: I1abe4410169e305a0d6106e24c54e7f2e763fc91
Merged-In: I7c9c48ea7f1ad01a02524beabf9d30baa3db891f
Fixes: 67997761
Fixes: 74887543
Test: RunSettingsRoboTests

6 files changed, 221 insertions, 199 deletions

diff --git a/src/com/android/settings/nfc/AndroidBeamEnabler.java b/src/com/android/settings/nfc/AndroidBeamEnabler.java
index 66e42b6418..1808775353 100644
--- a/src/com/android/settings/nfc/AndroidBeamEnabler.java
+++ b/src/com/android/settings/nfc/AndroidBeamEnabler.java
@@ -20,7 +20,6 @@ import android.content.Context;
 import android.nfc.NfcAdapter;
 import android.os.UserHandle;
 import android.os.UserManager;
-import android.support.v7.preference.Preference;
 
 import com.android.settings.R;
 import com.android.settingslib.RestrictedLockUtils;
@@ -36,18 +35,14 @@ public class AndroidBeamEnabler extends BaseNfcEnabler {
 
     public AndroidBeamEnabler(Context context, RestrictedPreference preference) {
         super(context);
-
         mPreference = preference;
-
         mBeamDisallowedBySystem = RestrictedLockUtils.hasBaseUserRestriction(context,
                 UserManager.DISALLOW_OUTGOING_BEAM, UserHandle.myUserId());
-
         if (!isNfcAvailable()) {
             // NFC is not supported
             mPreference.setEnabled(false);
             return;
         }
-
         if (mBeamDisallowedBySystem) {
             mPreference.setEnabled(false);
         }
diff --git a/src/com/android/settings/nfc/AndroidBeamPreferenceController.java b/src/com/android/settings/nfc/AndroidBeamPreferenceController.java
index 6ae7fe5ccf..b4026de15a 100644
--- a/src/com/android/settings/nfc/AndroidBeamPreferenceController.java
+++ b/src/com/android/settings/nfc/AndroidBeamPreferenceController.java
@@ -16,34 +16,75 @@
 package com.android.settings.nfc;
 
 import android.content.Context;
+import android.nfc.NfcAdapter;
+import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceScreen;
 
-import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settings.core.BasePreferenceController;
 import com.android.settingslib.RestrictedPreference;
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
 import com.android.settingslib.core.lifecycle.events.OnPause;
 import com.android.settingslib.core.lifecycle.events.OnResume;
 
-public class AndroidBeamPreferenceController extends BaseNfcPreferenceController {
+import java.util.List;
+
+public class AndroidBeamPreferenceController extends BasePreferenceController
+        implements LifecycleObserver, OnResume, OnPause {
 
     public static final String KEY_ANDROID_BEAM_SETTINGS = "android_beam_settings";
+    private final NfcAdapter mNfcAdapter;
+    private AndroidBeamEnabler mAndroidBeamEnabler;
+    private NfcAirplaneModeObserver mAirplaneModeObserver;
 
-    public AndroidBeamPreferenceController(Context context) {
-        super(context);
+    public AndroidBeamPreferenceController(Context context, String key) {
+        super(context, key);
+        mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
     }
 
     @Override
     public void displayPreference(PreferenceScreen screen) {
         super.displayPreference(screen);
         if (!isAvailable()) {
+            mAndroidBeamEnabler = null;
             return;
         }
 
-        mNfcEnabler = new AndroidBeamEnabler(mContext, (RestrictedPreference) mPreference);
+        final RestrictedPreference restrictedPreference =
+                (RestrictedPreference) screen.findPreference(getPreferenceKey());
+        mAndroidBeamEnabler = new AndroidBeamEnabler(mContext, restrictedPreference);
+
+        // Manually set dependencies for NFC when not toggleable.
+        if (!NfcPreferenceController.isToggleableInAirplaneMode(mContext)) {
+            mAirplaneModeObserver = new NfcAirplaneModeObserver(mContext, mNfcAdapter,
+                    (Preference) restrictedPreference);
+        }
     }
 
     @Override
-    public String getPreferenceKey() {
-        return KEY_ANDROID_BEAM_SETTINGS;
+    @AvailabilityStatus
+    public int getAvailabilityStatus() {
+        return mNfcAdapter != null
+                ? AVAILABLE
+                : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public void onResume() {
+        if (mAirplaneModeObserver != null) {
+            mAirplaneModeObserver.register();
+        }
+        if (mAndroidBeamEnabler != null) {
+            mAndroidBeamEnabler.resume();
+        }
+    }
+
+    @Override
+    public void onPause() {
+        if (mAirplaneModeObserver != null) {
+            mAirplaneModeObserver.unregister();
+        }
+        if (mAndroidBeamEnabler != null) {
+            mAndroidBeamEnabler.pause();
+        }
     }
 }
diff --git a/src/com/android/settings/nfc/BaseNfcPreferenceController.java b/src/com/android/settings/nfc/BaseNfcPreferenceController.java
deleted file mode 100644
index 33d75fab67..0000000000
--- a/src/com/android/settings/nfc/BaseNfcPreferenceController.java
+++ /dev/null
@@ -1,147 +0,0 @@
-/*
- * Copyright (C) 2018 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.android.settings.nfc;
-
-import android.content.Context;
-import android.database.ContentObserver;
-import android.net.Uri;
-import android.nfc.NfcAdapter;
-import android.nfc.NfcManager;
-import android.os.Handler;
-import android.provider.Settings;
-import android.support.v7.preference.Preference;
-import android.support.v7.preference.PreferenceScreen;
-
-import com.android.settings.core.PreferenceControllerMixin;
-import com.android.settingslib.core.AbstractPreferenceController;
-import com.android.settingslib.core.lifecycle.LifecycleObserver;
-import com.android.settingslib.core.lifecycle.events.OnPause;
-import com.android.settingslib.core.lifecycle.events.OnResume;
-
-import java.util.List;
-
-public abstract class BaseNfcPreferenceController extends AbstractPreferenceController
-        implements PreferenceControllerMixin, LifecycleObserver, OnResume, OnPause {
-
-    protected BaseNfcEnabler mNfcEnabler;
-    private NfcAdapter mNfcAdapter;
-    private int mAirplaneMode;
-    private AirplaneModeObserver mAirplaneModeObserver;
-    protected Preference mPreference;
-
-    public BaseNfcPreferenceController(Context context) {
-        super(context);
-        mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
-    }
-
-    @Override
-    public void displayPreference(PreferenceScreen screen) {
-        super.displayPreference(screen);
-
-        if (!isAvailable()) {
-            mNfcEnabler = null;
-            return;
-        }
-
-        mPreference = screen.findPreference(getPreferenceKey());
-
-        // Manually set dependencies for NFC when not toggleable.
-        if (!isToggleableInAirplaneMode(mContext)) {
-            mAirplaneModeObserver = new AirplaneModeObserver();
-            updateNfcPreference();
-        }
-    }
-
-    @Override
-    public void updateNonIndexableKeys(List<String> keys) {
-        if (!isAvailable()) {
-            keys.add(getPreferenceKey());
-        }
-    }
-
-    @Override
-    public boolean isAvailable() {
-        return mNfcAdapter != null;
-    }
-
-    public abstract String getPreferenceKey();
-
-    @Override
-    public void onResume() {
-        if (mAirplaneModeObserver != null) {
-            mAirplaneModeObserver.register();
-        }
-        if (mNfcEnabler != null) {
-            mNfcEnabler.resume();
-        }
-    }
-
-    @Override
-    public void onPause() {
-        if (mAirplaneModeObserver != null) {
-            mAirplaneModeObserver.unregister();
-        }
-        if (mNfcEnabler != null) {
-            mNfcEnabler.pause();
-        }
-    }
-
-    private void updateNfcPreference() {
-        final int airplaneMode = Settings.Global.getInt(
-                mContext.getContentResolver(), Settings.Global.AIRPLANE_MODE_ON, mAirplaneMode);
-        if (airplaneMode == mAirplaneMode) {
-            return;
-        }
-        mAirplaneMode = airplaneMode;
-        boolean toggleable = mAirplaneMode != 1;
-        if (toggleable) {
-            mNfcAdapter.enable();
-        } else {
-            mNfcAdapter.disable();
-        }
-        mPreference.setEnabled(toggleable);
-    }
-
-    public static boolean isToggleableInAirplaneMode(Context context) {
-        String toggleable = Settings.Global.getString(context.getContentResolver(),
-                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
-        return toggleable != null && toggleable.contains(Settings.Global.RADIO_NFC);
-    }
-
-    private final class AirplaneModeObserver extends ContentObserver {
-        private final Uri AIRPLANE_MODE_URI =
-                Settings.Global.getUriFor(Settings.Global.AIRPLANE_MODE_ON);
-
-        private AirplaneModeObserver() {
-            super(new Handler());
-        }
-
-        public void register() {
-            mContext.getContentResolver().registerContentObserver(AIRPLANE_MODE_URI, false, this);
-        }
-
-        public void unregister() {
-            mContext.getContentResolver().unregisterContentObserver(this);
-        }
-
-        @Override
-        public void onChange(boolean selfChange, Uri uri) {
-            super.onChange(selfChange, uri);
-            updateNfcPreference();
-        }
-    }
-
-}
diff --git a/src/com/android/settings/nfc/NfcAirplaneModeObserver.java b/src/com/android/settings/nfc/NfcAirplaneModeObserver.java
new file mode 100644
index 0000000000..723d814391
--- /dev/null
+++ b/src/com/android/settings/nfc/NfcAirplaneModeObserver.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2018 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.android.settings.nfc;
+
+import android.content.Context;
+import android.database.ContentObserver;
+import android.net.Uri;
+import android.nfc.NfcAdapter;
+import android.os.Handler;
+import android.os.Looper;
+import android.provider.Settings;
+import android.support.annotation.VisibleForTesting;
+import android.support.v7.preference.Preference;
+
+/**
+ * NfcAirplaneModeObserver is a helper to manage the Nfc on/off when airplane mode status
+ * is changed.
+ */
+public class NfcAirplaneModeObserver extends ContentObserver {
+
+    private final Context mContext;
+    private final NfcAdapter mNfcAdapter;
+    private final Preference mPreference;
+    private int mAirplaneMode;
+
+    @VisibleForTesting
+    final static Uri AIRPLANE_MODE_URI =
+            Settings.Global.getUriFor(Settings.Global.AIRPLANE_MODE_ON);
+
+    public NfcAirplaneModeObserver(Context context, NfcAdapter nfcAdapter, Preference preference) {
+        super(new Handler(Looper.getMainLooper()));
+        mContext = context;
+        mNfcAdapter = nfcAdapter;
+        mPreference = preference;
+        updateNfcPreference();
+    }
+
+    public void register() {
+        mContext.getContentResolver().registerContentObserver(AIRPLANE_MODE_URI, false, this);
+    }
+
+    public void unregister() {
+        mContext.getContentResolver().unregisterContentObserver(this);
+    }
+
+    @Override
+    public void onChange(boolean selfChange, Uri uri) {
+        super.onChange(selfChange, uri);
+        updateNfcPreference();
+    }
+
+    private void updateNfcPreference() {
+        final int airplaneMode = Settings.Global.getInt(
+                mContext.getContentResolver(), Settings.Global.AIRPLANE_MODE_ON, mAirplaneMode);
+        if (airplaneMode == mAirplaneMode) {
+            return;
+        }
+
+        mAirplaneMode = airplaneMode;
+        boolean toggleable = mAirplaneMode != 1;
+        if (toggleable) {
+            mNfcAdapter.enable();
+        } else {
+            mNfcAdapter.disable();
+        }
+        mPreference.setEnabled(toggleable);
+    }
+}
diff --git a/src/com/android/settings/nfc/NfcEnabler.java b/src/com/android/settings/nfc/NfcEnabler.java
index 29cef99355..f39a0a1a46 100644
--- a/src/com/android/settings/nfc/NfcEnabler.java
+++ b/src/com/android/settings/nfc/NfcEnabler.java
@@ -18,52 +18,20 @@ package com.android.settings.nfc;
 
 import android.content.Context;
 import android.nfc.NfcAdapter;
-import android.support.v7.preference.Preference;
 import android.support.v14.preference.SwitchPreference;
 
 /**
  * NfcEnabler is a helper to manage the Nfc on/off checkbox preference. It turns on/off Nfc
  * and ensures the summary of the preference reflects the current state.
  */
-public class NfcEnabler extends BaseNfcEnabler implements Preference.OnPreferenceChangeListener {
+public class NfcEnabler extends BaseNfcEnabler {
     private final SwitchPreference mPreference;
 
     public NfcEnabler(Context context, SwitchPreference preference) {
         super(context);
-
         mPreference = preference;
     }
 
-    public void resume() {
-        super.resume();
-        if (isNfcAvailable()) {
-            mPreference.setOnPreferenceChangeListener(this);
-        }
-    }
-
-    public void pause() {
-        super.pause();
-        if (isNfcAvailable()) {
-            mPreference.setOnPreferenceChangeListener(null);
-        }
-    }
-
-    public boolean onPreferenceChange(Preference preference, Object value) {
-        // Turn NFC on/off
-
-        final boolean desiredState = (Boolean) value;
-        mPreference.setChecked(desiredState);
-        mPreference.setEnabled(false);
-
-        if (desiredState) {
-            mNfcAdapter.enable();
-        } else {
-            mNfcAdapter.disable();
-        }
-
-        return false;
-    }
-
     @Override
     protected void handleNfcStateChanged(int newState) {
         switch (newState) {
diff --git a/src/com/android/settings/nfc/NfcPreferenceController.java b/src/com/android/settings/nfc/NfcPreferenceController.java
index a0678e0afa..a5d7c768ec 100644
--- a/src/com/android/settings/nfc/NfcPreferenceController.java
+++ b/src/com/android/settings/nfc/NfcPreferenceController.java
@@ -16,35 +16,119 @@
 package com.android.settings.nfc;
 
 import android.content.Context;
+import android.content.IntentFilter;
+import android.nfc.NfcAdapter;
+import android.provider.Settings;
+import android.text.TextUtils;
+
+import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceScreen;
 import android.support.v14.preference.SwitchPreference;
 
-import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settings.core.TogglePreferenceController;
 import com.android.settingslib.core.lifecycle.LifecycleObserver;
 import com.android.settingslib.core.lifecycle.events.OnPause;
 import com.android.settingslib.core.lifecycle.events.OnResume;
 
+import java.util.List;
 
-public class NfcPreferenceController extends BaseNfcPreferenceController {
+public class NfcPreferenceController extends TogglePreferenceController
+        implements LifecycleObserver, OnResume, OnPause {
 
     public static final String KEY_TOGGLE_NFC = "toggle_nfc";
+    private final NfcAdapter mNfcAdapter;
+    private NfcEnabler mNfcEnabler;
+    private NfcAirplaneModeObserver mAirplaneModeObserver;
 
-    public NfcPreferenceController(Context context) {
-        super(context);
+    public NfcPreferenceController(Context context, String key) {
+        super(context, key);
+        mNfcAdapter = NfcAdapter.getDefaultAdapter(context);
     }
 
     @Override
     public void displayPreference(PreferenceScreen screen) {
         super.displayPreference(screen);
         if (!isAvailable()) {
+            mNfcEnabler = null;
             return;
         }
 
-        mNfcEnabler = new NfcEnabler(mContext, (SwitchPreference) mPreference);
+        final SwitchPreference switchPreference =
+                (SwitchPreference) screen.findPreference(getPreferenceKey());
+
+        mNfcEnabler = new NfcEnabler(mContext, switchPreference);
+
+        // Manually set dependencies for NFC when not toggleable.
+        if (!isToggleableInAirplaneMode(mContext)) {
+            mAirplaneModeObserver = new NfcAirplaneModeObserver(mContext,
+                    mNfcAdapter, (Preference) switchPreference);
+        }
+    }
+
+    @Override
+    public boolean isChecked() {
+        return mNfcAdapter.isEnabled();
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        if (isChecked) {
+            mNfcAdapter.enable();
+        } else {
+            mNfcAdapter.disable();
+        }
+        return true;
+    }
+
+    @Override
+    @AvailabilityStatus
+    public int getAvailabilityStatus() {
+        return mNfcAdapter != null
+                ? AVAILABLE
+                : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public IntentFilter getIntentFilter() {
+        final IntentFilter filter = new IntentFilter();
+        filter.addAction(NfcAdapter.ACTION_ADAPTER_STATE_CHANGED);
+        filter.addAction(NfcAdapter.EXTRA_ADAPTER_STATE);
+        return filter;
+    }
+
+    @Override
+    public boolean hasAsyncUpdate() {
+        return true;
+    }
+
+    @Override
+    public boolean isSliceable() {
+        return TextUtils.equals(getPreferenceKey(), KEY_TOGGLE_NFC);
+    }
+
+    @Override
+    public void onResume() {
+        if (mAirplaneModeObserver != null) {
+            mAirplaneModeObserver.register();
+        }
+        if (mNfcEnabler != null) {
+            mNfcEnabler.resume();
+        }
     }
 
     @Override
-    public String getPreferenceKey() {
-        return KEY_TOGGLE_NFC;
+    public void onPause() {
+        if (mAirplaneModeObserver != null) {
+            mAirplaneModeObserver.unregister();
+        }
+        if (mNfcEnabler != null) {
+            mNfcEnabler.pause();
+        }
+    }
+
+    public static boolean isToggleableInAirplaneMode(Context context) {
+        final String toggleable = Settings.Global.getString(context.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
+        return toggleable != null && toggleable.contains(Settings.Global.RADIO_NFC);
     }
 }