Various lint error fixes.

> Fixing some RTL errors by specifying both marginStart and marginLeft
> Moving all layout direction checks to Utilities
> Explicitely adding @TargetApi before every method

Change-Id: Ibe9c52b93b5a6adeadb27ace2b312770fd732ea0

43 files changed, 181 insertions, 132 deletions

diff --git a/WallpaperPicker/src/com/android/gallery3d/exif/ExifInterface.java b/WallpaperPicker/src/com/android/gallery3d/exif/ExifInterface.java
index a1cf0fc85..9247e879f 100644
--- a/WallpaperPicker/src/com/android/gallery3d/exif/ExifInterface.java
+++ b/WallpaperPicker/src/com/android/gallery3d/exif/ExifInterface.java
@@ -1247,7 +1247,7 @@ public class ExifInterface {
         if (l == null || l.length <= 0) {
             return null;
         }
-        return new Long(l[0]);
+        return Long.valueOf(l[0]);
     }
 
     /**
@@ -1266,7 +1266,7 @@ public class ExifInterface {
         if (l == null || l.length <= 0) {
             return null;
         }
-        return new Integer(l[0]);
+        return Integer.valueOf(l[0]);
     }
 
     /**
@@ -1285,7 +1285,7 @@ public class ExifInterface {
         if (l == null || l.length <= 0) {
             return null;
         }
-        return new Byte(l[0]);
+        return Byte.valueOf(l[0]);
     }
 
     /**
diff --git a/WallpaperPicker/src/com/android/launcher3/WallpaperCropActivity.java b/WallpaperPicker/src/com/android/launcher3/WallpaperCropActivity.java
index 142a9cb10..affad0f45 100644
--- a/WallpaperPicker/src/com/android/launcher3/WallpaperCropActivity.java
+++ b/WallpaperPicker/src/com/android/launcher3/WallpaperCropActivity.java
@@ -190,7 +190,7 @@ public class WallpaperCropActivity extends BaseActivity implements Handler.Callb
                     }
                 });
             } catch (SecurityException securityException) {
-                if (isDestroyed()) {
+                if (isActivityDestroyed()) {
                     // Temporarily granted permissions are revoked when the activity
                     // finishes, potentially resulting in a SecurityException here.
                     // Even though {@link #isDestroyed} might also return true in different
@@ -221,6 +221,12 @@ public class WallpaperCropActivity extends BaseActivity implements Handler.Callb
         return false;
     }
 
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
+    protected boolean isActivityDestroyed() {
+        return (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1)
+                && isDestroyed();
+    }
+
     @Thunk void addReusableBitmap(TileSource src) {
         synchronized (mReusableBitmaps) {
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
diff --git a/WallpaperPicker/src/com/android/launcher3/WallpaperPickerActivity.java b/WallpaperPicker/src/com/android/launcher3/WallpaperPickerActivity.java
index 93320919e..1ba5b4b2e 100644
--- a/WallpaperPicker/src/com/android/launcher3/WallpaperPickerActivity.java
+++ b/WallpaperPicker/src/com/android/launcher3/WallpaperPickerActivity.java
@@ -665,7 +665,7 @@ public class WallpaperPickerActivity extends WallpaperCropActivity {
     }
 
     @Thunk void initializeScrollForRtl() {
-        if (mWallpaperScrollContainer.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL) {
+        if (Utilities.isRtl(getResources())) {
             final ViewTreeObserver observer = mWallpaperScrollContainer.getViewTreeObserver();
             observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
                 public void onGlobalLayout() {
@@ -838,7 +838,7 @@ public class WallpaperPickerActivity extends WallpaperCropActivity {
                     int rotation = BitmapUtils.getRotationFromExif(context, uri);
                     return createThumbnail(defaultSize, context, uri, null, null, 0, rotation, false);
                 } catch (SecurityException securityException) {
-                    if (isDestroyed()) {
+                    if (isActivityDestroyed()) {
                         // Temporarily granted permissions are revoked when the activity
                         // finishes, potentially resulting in a SecurityException here.
                         // Even though {@link #isDestroyed} might also return true in different
diff --git a/res/layout-land/launcher.xml b/res/layout-land/launcher.xml
index d5dd91ab4..f0f7bbb9f 100644
--- a/res/layout-land/launcher.xml
+++ b/res/layout-land/launcher.xml
@@ -18,7 +18,6 @@
 <com.android.launcher3.LauncherRootView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:launcher="http://schemas.android.com/apk/res-auto"
-
     android:id="@+id/launcher"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
diff --git a/res/layout-land/migration_cling.xml b/res/layout-land/migration_cling.xml
index db93da87a..269c1aee6 100644
--- a/res/layout-land/migration_cling.xml
+++ b/res/layout-land/migration_cling.xml
@@ -46,6 +46,7 @@
         android:layout_width="@dimen/cling_migration_content_width"
         android:layout_height="wrap_content"
         android:layout_marginEnd="@dimen/cling_migration_content_margin"
+        android:layout_marginRight="@dimen/cling_migration_content_margin"
         android:orientation="vertical"
         android:paddingLeft="24dp"
         android:paddingRight="24dp" >
diff --git a/res/layout-port/migration_cling.xml b/res/layout-port/migration_cling.xml
index 81689d38b..3f696a216 100644
--- a/res/layout-port/migration_cling.xml
+++ b/res/layout-port/migration_cling.xml
@@ -48,6 +48,7 @@
             android:layout_height="wrap_content"
             android:layout_below="@+id/ic_cling_migration"
             android:layout_marginStart="@dimen/cling_migration_content_margin"
+            android:layout_marginLeft="@dimen/cling_migration_content_margin"
             android:orientation="vertical"
             android:paddingLeft="24dp"
             android:paddingRight="24dp" >
diff --git a/res/layout/apps_list_view.xml b/res/layout/apps_list_view.xml
index ef20323c1..5e50191ea 100644
--- a/res/layout/apps_list_view.xml
+++ b/res/layout/apps_list_view.xml
@@ -56,6 +56,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_gravity="start|center_vertical"
+                android:layout_marginLeft="4dp"
                 android:layout_marginStart="4dp"
                 android:paddingTop="13dp"
                 android:paddingBottom="13dp"
@@ -86,6 +87,7 @@
             android:layout_height="wrap_content"
             android:layout_gravity="end|center_vertical"
             android:layout_marginEnd="6dp"
+            android:layout_marginRight="6dp"
             android:paddingTop="13dp"
             android:paddingBottom="13dp"
             android:contentDescription="@string/apps_view_search_bar_hint"
diff --git a/res/layout/search_drop_target_bar.xml b/res/layout/search_drop_target_bar.xml
index 69f42bb4c..b0435aa0e 100644
--- a/res/layout/search_drop_target_bar.xml
+++ b/res/layout/search_drop_target_bar.xml
@@ -36,6 +36,7 @@
             <com.android.launcher3.DeleteDropTarget
                 android:id="@+id/delete_target_text"
                 style="@style/DropTargetButton"
+                android:drawableLeft="@drawable/remove_target_selector"
                 android:drawableStart="@drawable/remove_target_selector"
                 android:text="@string/delete_target_label" />
         </FrameLayout>
@@ -49,6 +50,7 @@
             <com.android.launcher3.InfoDropTarget
                 android:id="@+id/info_target_text"
                 style="@style/DropTargetButton"
+                android:drawableLeft="@drawable/info_target_selector"
                 android:drawableStart="@drawable/info_target_selector"
                 android:text="@string/info_target_label" />
         </FrameLayout>
@@ -62,6 +64,7 @@
             <com.android.launcher3.UninstallDropTarget
                 android:id="@+id/uninstall_target_text"
                 style="@style/DropTargetButton"
+                android:drawableLeft="@drawable/uninstall_target_selector"
                 android:drawableStart="@drawable/uninstall_target_selector"
                 android:text="@string/delete_target_uninstall_label" />
         </FrameLayout>
diff --git a/res/layout/widgets_list_row_view.xml b/res/layout/widgets_list_row_view.xml
index 2cbdb5cff..be62ee9fc 100644
--- a/res/layout/widgets_list_row_view.xml
+++ b/res/layout/widgets_list_row_view.xml
@@ -58,6 +58,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginStart="@dimen/widget_row_padding"
+            android:layout_marginLeft="@dimen/widget_row_padding"
             android:orientation="horizontal"
             android:divider="@drawable/widgets_row_divider"
             android:showDividers="middle"
diff --git a/res/values-land/styles.xml b/res/values-land/styles.xml
index 8a255c91b..c5a76d595 100644
--- a/res/values-land/styles.xml
+++ b/res/values-land/styles.xml
@@ -28,7 +28,7 @@
     </style>
 
     <!-- This style applies to the drop target when it is shown in the sidebar -->
-    <style name="DropTargetButton" parent="DropTargetButton.Base">
+    <style name="DropTargetButton" parent="DropTargetButtonBase">
         <item name="android:layout_height">wrap_content</item>
         <item name="android:gravity">center</item>
         <item name="android:drawablePadding">0dp</item>
diff --git a/res/values-sw720dp/styles.xml b/res/values-sw720dp/styles.xml
index cbc1e29b3..e8b706e23 100644
--- a/res/values-sw720dp/styles.xml
+++ b/res/values-sw720dp/styles.xml
@@ -27,7 +27,7 @@
         <item name="android:layout_height">match_parent</item>
     </style>
 
-    <style name="DropTargetButton" parent="DropTargetButton.Base">
+    <style name="DropTargetButton" parent="DropTargetButtonBase">
         <item name="android:paddingLeft">60dp</item>
         <item name="android:paddingRight">60dp</item>
         <item name="android:shadowColor">#393939</item>
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 78cc0837f..f95debeab 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -54,7 +54,7 @@
         <item name="android:layout_height">match_parent</item>
     </style>
 
-    <style name="DropTargetButton.Base">
+    <style name="DropTargetButtonBase">
         <item name="android:layout_width">wrap_content</item>
         <item name="android:layout_height">match_parent</item>
         <item name="android:layout_gravity">center</item>
@@ -72,7 +72,7 @@
         <item name="android:shadowRadius">4.0</item>
     </style>
 
-    <style name="DropTargetButton" parent="DropTargetButton.Base"></style>
+    <style name="DropTargetButton" parent="DropTargetButtonBase" />
 
     <style name="PreloadIcon">
         <item name="background">@drawable/virtual_preload</item>
diff --git a/src/com/android/launcher3/AppsContainerRecyclerView.java b/src/com/android/launcher3/AppsContainerRecyclerView.java
index 34e621a46..d35f99d73 100644
--- a/src/com/android/launcher3/AppsContainerRecyclerView.java
+++ b/src/com/android/launcher3/AppsContainerRecyclerView.java
@@ -292,8 +292,7 @@ public class AppsContainerRecyclerView extends BaseContainerRecyclerView {
         if (mFastScrollAlpha > 0f && !mFastScrollSectionName.isEmpty()) {
             int x;
             int y;
-            boolean isRtl = (getResources().getConfiguration().getLayoutDirection() ==
-                    LAYOUT_DIRECTION_RTL);
+            boolean isRtl = Utilities.isRtl(getResources());
 
             // Calculate the position for the fast scroller popup
             Rect bgBounds = mFastScrollerBg.getBounds();
@@ -411,8 +410,7 @@ public class AppsContainerRecyclerView extends BaseContainerRecyclerView {
         // Find the index and height of the first visible row (all rows have the same height)
         int x;
         int y;
-        boolean isRtl = (getResources().getConfiguration().getLayoutDirection() ==
-                LAYOUT_DIRECTION_RTL);
+        boolean isRtl = Utilities.isRtl(getResources());
         int rowCount = getNumRows();
         getCurScrollState(mScrollPosState, items);
         if (mScrollPosState.rowIndex != -1) {
diff --git a/src/com/android/launcher3/AppsContainerView.java b/src/com/android/launcher3/AppsContainerView.java
index a74670be0..b752905a2 100644
--- a/src/com/android/launcher3/AppsContainerView.java
+++ b/src/com/android/launcher3/AppsContainerView.java
@@ -15,12 +15,15 @@
  */
 package com.android.launcher3;
 
+import android.annotation.SuppressLint;
+import android.annotation.TargetApi;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.graphics.drawable.InsetDrawable;
+import android.os.Build;
 import android.support.v7.widget.RecyclerView;
 import android.text.Editable;
 import android.text.TextWatcher;
@@ -198,8 +201,7 @@ public class AppsContainerView extends BaseContainerView implements DragSource,
 
     @Override
     protected void onFinishInflate() {
-        boolean isRtl = (getResources().getConfiguration().getLayoutDirection() ==
-                LAYOUT_DIRECTION_RTL);
+        boolean isRtl = Utilities.isRtl(getResources());
         mAdapter.setRtl(isRtl);
 
         // Work around the search box getting first focus and showing the cursor by
@@ -329,8 +331,7 @@ public class AppsContainerView extends BaseContainerView implements DragSource,
      */
     @Override
     protected void onUpdatePaddings() {
-        boolean isRtl = (getResources().getConfiguration().getLayoutDirection() ==
-                LAYOUT_DIRECTION_RTL);
+        boolean isRtl = Utilities.isRtl(getResources());
         boolean hasSearchBar = (mSearchBarEditView != null) &&
                 (mSearchBarEditView.getVisibility() == View.VISIBLE);
 
@@ -396,11 +397,13 @@ public class AppsContainerView extends BaseContainerView implements DragSource,
         return handleTouchEvent(ev);
     }
 
+    @SuppressLint("ClickableViewAccessibility")
     @Override
     public boolean onTouchEvent(MotionEvent ev) {
         return handleTouchEvent(ev);
     }
 
+    @SuppressLint("ClickableViewAccessibility")
     @Override
     public boolean onTouch(View v, MotionEvent ev) {
         switch (ev.getAction()) {
@@ -614,6 +617,7 @@ public class AppsContainerView extends BaseContainerView implements DragSource,
     /**
      * Updates the container when the recycler view is scrolled.
      */
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     private void onRecyclerViewScrolled() {
         if (DYNAMIC_HEADER_ELEVATION && Utilities.isLmpOrAbove()) {
             int elevation = DynamicGrid.pxFromDp(HEADER_ELEVATION_DP,
diff --git a/src/com/android/launcher3/BubbleTextView.java b/src/com/android/launcher3/BubbleTextView.java
index d32c91919..bbcd893f2 100644
--- a/src/com/android/launcher3/BubbleTextView.java
+++ b/src/com/android/launcher3/BubbleTextView.java
@@ -16,6 +16,7 @@
 
 package com.android.launcher3;
 
+import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.ColorStateList;
 import android.content.res.Resources;
@@ -25,6 +26,7 @@ import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Region;
 import android.graphics.drawable.Drawable;
+import android.os.Build;
 import android.util.AttributeSet;
 import android.util.SparseArray;
 import android.util.TypedValue;
@@ -444,15 +446,20 @@ public class BubbleTextView extends TextView {
     /**
      * Sets the icon for this view based on the layout direction.
      */
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
     private Drawable setIcon(Drawable icon, int iconSize) {
         mIcon = icon;
         if (iconSize != -1) {
             mIcon.setBounds(0, 0, iconSize, iconSize);
         }
         if (mLayoutHorizontal) {
-            setCompoundDrawablesRelative(mIcon, null, null, null);
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+                setCompoundDrawablesRelative(mIcon, null, null, null);
+            } else {
+                setCompoundDrawables(mIcon, null, null, null);
+            }
         } else {
-            setCompoundDrawablesRelative(null, mIcon, null, null);
+            setCompoundDrawables(null, mIcon, null, null);
         }
         return icon;
     }
diff --git a/src/com/android/launcher3/ButtonDropTarget.java b/src/com/android/launcher3/ButtonDropTarget.java
index 683c511da..b8214d1ef 100644
--- a/src/com/android/launcher3/ButtonDropTarget.java
+++ b/src/com/android/launcher3/ButtonDropTarget.java
@@ -83,6 +83,7 @@ public abstract class ButtonDropTarget extends TextView
         }
     }
 
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
     protected void setDrawable(int resId) {
         // Get the hover color
         mDrawable = (TransitionDrawable) getCurrentDrawable();
@@ -90,7 +91,11 @@ public abstract class ButtonDropTarget extends TextView
         if (mDrawable == null) {
             // TODO: investigate why this is ever happening. Presently only on one known device.
             mDrawable = (TransitionDrawable) getResources().getDrawable(resId);
-            setCompoundDrawablesRelativeWithIntrinsicBounds(mDrawable, null, null, null);
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+                setCompoundDrawablesRelativeWithIntrinsicBounds(mDrawable, null, null, null);
+            } else {
+                setCompoundDrawablesWithIntrinsicBounds(mDrawable, null, null, null);
+            }
         }
 
         if (null != mDrawable) {
@@ -107,7 +112,7 @@ public abstract class ButtonDropTarget extends TextView
     }
 
     protected Drawable getCurrentDrawable() {
-        Drawable[] drawables = getCompoundDrawablesRelative();
+        Drawable[] drawables = getCompoundDrawables();
         for (int i = 0; i < drawables.length; ++i) {
             if (drawables[i] != null) {
                 return drawables[i];
@@ -241,10 +246,6 @@ public abstract class ButtonDropTarget extends TextView
         outRect.offsetTo(coords[0], coords[1]);
     }
 
-    private boolean isRtl() {
-        return (getLayoutDirection() == LAYOUT_DIRECTION_RTL);
-    }
-
     protected Rect getIconRect(int viewWidth, int viewHeight, int drawableWidth, int drawableHeight) {
         DragLayer dragLayer = mLauncher.getDragLayer();
 
@@ -258,7 +259,7 @@ public abstract class ButtonDropTarget extends TextView
         final int left;
         final int right;
 
-        if (isRtl()) {
+        if (Utilities.isRtl(getResources())) {
             right = to.right - getPaddingRight();
             left = right - width;
         } else {
diff --git a/src/com/android/launcher3/DeviceProfile.java b/src/com/android/launcher3/DeviceProfile.java
index 890b9c9d8..33c3d508c 100644
--- a/src/com/android/launcher3/DeviceProfile.java
+++ b/src/com/android/launcher3/DeviceProfile.java
@@ -459,11 +459,7 @@ public class DeviceProfile {
         isLandscape = (configuration.orientation == Configuration.ORIENTATION_LANDSCAPE);
         isTablet = resources.getBoolean(R.bool.is_tablet);
         isLargeTablet = resources.getBoolean(R.bool.is_large_tablet);
-        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1) {
-            isLayoutRtl = (configuration.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL);
-        } else {
-            isLayoutRtl = false;
-        }
+        isLayoutRtl = Utilities.isRtl(resources);
         widthPx = wPx;
         heightPx = hPx;
         availableWidthPx = awPx;
diff --git a/src/com/android/launcher3/DragController.java b/src/com/android/launcher3/DragController.java
index 5fea9d889..f5c29ae0a 100644
--- a/src/com/android/launcher3/DragController.java
+++ b/src/com/android/launcher3/DragController.java
@@ -71,6 +71,7 @@ public class DragController {
     // temporaries to avoid gc thrash
     private Rect mRectTemp = new Rect();
     private final int[] mCoordinatesTemp = new int[2];
+    private final boolean mIsRtl;
 
     /** Whether or not we're dragging. */
     private boolean mDragging;
@@ -157,6 +158,7 @@ public class DragController {
         float density = r.getDisplayMetrics().density;
         mFlingToDeleteThresholdVelocity =
                 (int) (r.getInteger(R.integer.config_flingToDeleteMinVelocity) * density);
+        mIsRtl = Utilities.isRtl(r);
     }
 
     public boolean dragging() {
@@ -548,9 +550,8 @@ public class DragController {
         final int slop = ViewConfiguration.get(mLauncher).getScaledWindowTouchSlop();
         final int delay = mDistanceSinceScroll < slop ? RESCROLL_DELAY : SCROLL_DELAY;
         final DragLayer dragLayer = mLauncher.getDragLayer();
-        final boolean isRtl = (dragLayer.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL);
-        final int forwardDirection = isRtl ? SCROLL_RIGHT : SCROLL_LEFT;
-        final int backwardsDirection = isRtl ? SCROLL_LEFT : SCROLL_RIGHT;
+        final int forwardDirection = mIsRtl ? SCROLL_RIGHT : SCROLL_LEFT;
+        final int backwardsDirection = mIsRtl ? SCROLL_LEFT : SCROLL_RIGHT;
 
         if (x < mScrollZone) {
             if (mScrollState == SCROLL_OUTSIDE_ZONE) {
diff --git a/src/com/android/launcher3/DragLayer.java b/src/com/android/launcher3/DragLayer.java
index 8ba25da69..e25e6152c 100644
--- a/src/com/android/launcher3/DragLayer.java
+++ b/src/com/android/launcher3/DragLayer.java
@@ -60,6 +60,7 @@ public class DragLayer extends InsettableFrameLayout {
     // Variables relating to resizing widgets
     private final ArrayList<AppWidgetResizeFrame> mResizeFrames =
             new ArrayList<AppWidgetResizeFrame>();
+    private final boolean mIsRtl;
     private AppWidgetResizeFrame mCurrentResizeFrame;
 
     // Variables relating to animation of views after drop
@@ -113,6 +114,7 @@ public class DragLayer extends InsettableFrameLayout {
         mRightHoverDrawable = res.getDrawable(R.drawable.page_hover_right);
         mLeftHoverDrawableActive = res.getDrawable(R.drawable.page_hover_left_active);
         mRightHoverDrawableActive = res.getDrawable(R.drawable.page_hover_right_active);
+        mIsRtl = Utilities.isRtl(res);
     }
 
     public void setup(Launcher launcher, DragController controller) {
@@ -920,13 +922,6 @@ public class DragLayer extends InsettableFrameLayout {
         invalidate();
     }
 
-    /**
-     * Note: this is a reimplementation of View.isLayoutRtl() since that is currently hidden api.
-     */
-    private boolean isLayoutRtl() {
-        return (getLayoutDirection() == LAYOUT_DIRECTION_RTL);
-    }
-
     @Override
     protected void dispatchDraw(Canvas canvas) {
         // Draw the background below children.
@@ -947,9 +942,8 @@ public class DragLayer extends InsettableFrameLayout {
                     childRect);
 
             int page = workspace.getNextPage();
-            final boolean isRtl = isLayoutRtl();
-            CellLayout leftPage = (CellLayout) workspace.getChildAt(isRtl ? page + 1 : page - 1);
-            CellLayout rightPage = (CellLayout) workspace.getChildAt(isRtl ? page - 1 : page + 1);
+            CellLayout leftPage = (CellLayout) workspace.getChildAt(mIsRtl ? page + 1 : page - 1);
+            CellLayout rightPage = (CellLayout) workspace.getChildAt(mIsRtl ? page - 1 : page + 1);
 
             if (leftPage != null && leftPage.isDragTarget()) {
                 Drawable left = mInScrollArea && leftPage.getIsDragOverlapping() ?
diff --git a/src/com/android/launcher3/DragView.java b/src/com/android/launcher3/DragView.java
index 3eec3d9ee..120299e1d 100644
--- a/src/com/android/launcher3/DragView.java
+++ b/src/com/android/launcher3/DragView.java
@@ -76,6 +76,7 @@ public class DragView extends View {
      * @param registrationX The x coordinate of the registration point.
      * @param registrationY The y coordinate of the registration point.
      */
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     public DragView(Launcher launcher, Bitmap bitmap, int registrationX, int registrationY,
             int left, int top, int width, int height, final float initialScale) {
         super(launcher);
diff --git a/src/com/android/launcher3/Folder.java b/src/com/android/launcher3/Folder.java
index 6e5941cf2..131633c1d 100644
--- a/src/com/android/launcher3/Folder.java
+++ b/src/com/android/launcher3/Folder.java
@@ -21,6 +21,7 @@ import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.PropertyValuesHolder;
+import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.Resources;
@@ -48,7 +49,6 @@ import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.LinearLayout;
 import android.widget.TextView;
-
 import com.android.launcher3.CellLayout.CellInfo;
 import com.android.launcher3.DragController.DragListener;
 import com.android.launcher3.FolderInfo.FolderListener;
@@ -56,7 +56,6 @@ import com.android.launcher3.LauncherAccessibilityDelegate.AccessibilityDragSour
 import com.android.launcher3.UninstallDropTarget.UninstallSource;
 import com.android.launcher3.Workspace.ItemOperator;
 import com.android.launcher3.util.Thunk;
-
 import java.util.ArrayList;
 import java.util.Collections;
 
@@ -330,6 +329,7 @@ public class Folder extends LinearLayout implements DragSource, View.OnClickList
     /**
      * We need to handle touch events to prevent them from falling through to the workspace below.
      */
+    @SuppressLint("ClickableViewAccessibility")
     @Override
     public boolean onTouchEvent(MotionEvent ev) {
         return true;
@@ -406,8 +406,9 @@ public class Folder extends LinearLayout implements DragSource, View.OnClickList
      *
      * @return A new UserFolder.
      */
-    static Folder fromXml(Context context) {
-        return (Folder) LayoutInflater.from(context).inflate(R.layout.user_folder, null);
+    static Folder fromXml(Launcher launcher) {
+        return (Folder) LayoutInflater.from(launcher).inflate(R.layout.user_folder,
+                launcher.getDragLayer(), false);
     }
 
     /**
@@ -698,10 +699,10 @@ public class Folder extends LinearLayout implements DragSource, View.OnClickList
         boolean isOutsideLeftEdge = x < cellOverlap;
         boolean isOutsideRightEdge = x > (getWidth() - cellOverlap);
 
-        if (currentPage > 0 && (mContent.rtlLayout ? isOutsideRightEdge : isOutsideLeftEdge)) {
+        if (currentPage > 0 && (mContent.mIsRtl ? isOutsideRightEdge : isOutsideLeftEdge)) {
             showScrollHint(DragController.SCROLL_LEFT, d);
         } else if (currentPage < (mContent.getPageCount() - 1)
-                && (mContent.rtlLayout ? isOutsideLeftEdge : isOutsideRightEdge)) {
+                && (mContent.mIsRtl ? isOutsideLeftEdge : isOutsideRightEdge)) {
             showScrollHint(DragController.SCROLL_RIGHT, d);
         } else {
             mOnScrollHintAlarm.cancelAlarm();
diff --git a/src/com/android/launcher3/FolderPagedView.java b/src/com/android/launcher3/FolderPagedView.java
index a6494d274..94c016dd3 100644
--- a/src/com/android/launcher3/FolderPagedView.java
+++ b/src/com/android/launcher3/FolderPagedView.java
@@ -55,7 +55,7 @@ public class FolderPagedView extends PagedView {
 
     private static final int[] sTempPosArray = new int[2];
 
-    public final boolean rtlLayout;
+    public final boolean mIsRtl;
 
     private final LayoutInflater mInflater;
     private final IconCache mIconCache;
@@ -89,7 +89,7 @@ public class FolderPagedView extends PagedView {
         mInflater = LayoutInflater.from(context);
         mIconCache = app.getIconCache();
 
-        rtlLayout = getResources().getConfiguration().getLayoutDirection() == LAYOUT_DIRECTION_RTL;
+        mIsRtl = Utilities.isRtl(getResources());
         setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES);
     }
 
@@ -439,7 +439,7 @@ public class FolderPagedView extends PagedView {
      * Scrolls the current view by a fraction
      */
     public void showScrollHint(int direction) {
-        float fraction = (direction == DragController.SCROLL_LEFT) ^ rtlLayout
+        float fraction = (direction == DragController.SCROLL_LEFT) ^ mIsRtl
                 ? -SCROLL_HINT_FRACTION : SCROLL_HINT_FRACTION;
         int hint = (int) (fraction * getWidth());
         int scroll = getScrollForPage(getNextPage()) + hint;
@@ -596,7 +596,7 @@ public class FolderPagedView extends PagedView {
                         }
                     };
                     v.animate()
-                        .translationXBy((direction > 0 ^ rtlLayout) ? -v.getWidth() : v.getWidth())
+                        .translationXBy((direction > 0 ^ mIsRtl) ? -v.getWidth() : v.getWidth())
                         .setDuration(REORDER_ANIMATION_DURATION)
                         .setStartDelay(0)
                         .withEndAction(endAction);
diff --git a/src/com/android/launcher3/InfoDropTarget.java b/src/com/android/launcher3/InfoDropTarget.java
index f1ff48da3..f3383ccea 100644
--- a/src/com/android/launcher3/InfoDropTarget.java
+++ b/src/com/android/launcher3/InfoDropTarget.java
@@ -16,8 +16,10 @@
 
 package com.android.launcher3;
 
+import android.annotation.TargetApi;
 import android.content.ComponentName;
 import android.content.Context;
+import android.os.Build;
 import android.provider.Settings;
 import android.util.AttributeSet;
 
@@ -68,10 +70,18 @@ public class InfoDropTarget extends ButtonDropTarget {
         return source.supportsAppInfoDropTarget() && supportsDrop(getContext(), info);
     }
 
+    @SuppressWarnings("deprecation")
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
     public static boolean supportsDrop(Context context, Object info) {
-        return (Settings.Global.getInt(context.getContentResolver(),
-                Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 0) == 1) &&
-                (info instanceof AppInfo || info instanceof PendingAddItemInfo);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+            return (Settings.Global.getInt(context.getContentResolver(),
+                    Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 0) == 1) &&
+                    (info instanceof AppInfo || info instanceof PendingAddItemInfo);
+        } else {
+            return (Settings.Secure.getInt(context.getContentResolver(),
+                    Settings.Secure.DEVELOPMENT_SETTINGS_ENABLED, 0) == 1) &&
+                    (info instanceof AppInfo || info instanceof PendingAddItemInfo);
+        }
     }
 
     @Override
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 8603a35df..72472b9f4 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -22,6 +22,7 @@ import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.PropertyValuesHolder;
 import android.animation.ValueAnimator;
+import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.ActivityManager;
@@ -64,7 +65,6 @@ import android.os.Handler;
 import android.os.Message;
 import android.os.StrictMode;
 import android.os.SystemClock;
-import android.preference.PreferenceManager;
 import android.text.Selection;
 import android.text.SpannableStringBuilder;
 import android.text.TextUtils;
@@ -2582,6 +2582,7 @@ public class Launcher extends Activity
         }
     }
 
+    @SuppressLint("ClickableViewAccessibility")
     public boolean onTouch(View v, MotionEvent event) {
         return false;
     }
@@ -2850,6 +2851,7 @@ public class Launcher extends Activity
     public View.OnTouchListener getHapticFeedbackTouchListener() {
         if (mHapticFeedbackTouchListener == null) {
             mHapticFeedbackTouchListener = new View.OnTouchListener() {
+                @SuppressLint("ClickableViewAccessibility")
                 @Override
                 public boolean onTouch(View v, MotionEvent event) {
                     if ((event.getAction() & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_DOWN) {
diff --git a/src/com/android/launcher3/LauncherAnimUtils.java b/src/com/android/launcher3/LauncherAnimUtils.java
index be295f8b3..6ff76665c 100644
--- a/src/com/android/launcher3/LauncherAnimUtils.java
+++ b/src/com/android/launcher3/LauncherAnimUtils.java
@@ -21,10 +21,11 @@ import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.PropertyValuesHolder;
 import android.animation.ValueAnimator;
+import android.annotation.TargetApi;
+import android.os.Build;
 import android.view.View;
 import android.view.ViewAnimationUtils;
 import android.view.ViewTreeObserver;
-
 import java.util.HashSet;
 import java.util.WeakHashMap;
 
@@ -128,6 +129,7 @@ public class LauncherAnimUtils {
         return anim;
     }
 
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     public static Animator createCircularReveal(View view, int centerX,
             int centerY, float startRadius, float endRadius) {
         Animator anim = ViewAnimationUtils.createCircularReveal(view, centerX,
diff --git a/src/com/android/launcher3/LauncherAppWidgetProviderInfo.java b/src/com/android/launcher3/LauncherAppWidgetProviderInfo.java
index af680f247..e19bc9534 100644
--- a/src/com/android/launcher3/LauncherAppWidgetProviderInfo.java
+++ b/src/com/android/launcher3/LauncherAppWidgetProviderInfo.java
@@ -1,10 +1,12 @@
 package com.android.launcher3;
 
+import android.annotation.TargetApi;
 import android.appwidget.AppWidgetProviderInfo;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.graphics.drawable.Drawable;
+import android.os.Build;
 import android.os.Parcel;
 
 /**
@@ -32,6 +34,7 @@ public class LauncherAppWidgetProviderInfo extends AppWidgetProviderInfo {
         info.writeToParcel(p, 0);
         p.setDataPosition(0);
         LauncherAppWidgetProviderInfo lawpi = new LauncherAppWidgetProviderInfo(p);
+        p.recycle();
 
         int[] minResizeSpan = Launcher.getMinSpanForWidget(context, lawpi);
         int[] span = Launcher.getSpanForWidget(context, lawpi);
@@ -64,6 +67,7 @@ public class LauncherAppWidgetProviderInfo extends AppWidgetProviderInfo {
         minSpanY = widget.getMinSpanY();
     }
 
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     public String getLabel(PackageManager packageManager) {
         if (isCustomWidget) {
             return Utilities.trim(label);
@@ -71,6 +75,7 @@ public class LauncherAppWidgetProviderInfo extends AppWidgetProviderInfo {
         return super.loadLabel(packageManager);
     }
 
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     public Drawable getIcon(Context context, IconCache cache) {
         if (isCustomWidget) {
             return cache.getFullResIcon(provider.getPackageName(), icon);
diff --git a/src/com/android/launcher3/LauncherClings.java b/src/com/android/launcher3/LauncherClings.java
index a2c56a91c..63d3ebc23 100644
--- a/src/com/android/launcher3/LauncherClings.java
+++ b/src/com/android/launcher3/LauncherClings.java
@@ -20,10 +20,12 @@ import android.accounts.Account;
 import android.accounts.AccountManager;
 import android.animation.ObjectAnimator;
 import android.animation.PropertyValuesHolder;
+import android.annotation.TargetApi;
 import android.app.ActivityManager;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.graphics.drawable.Drawable;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.UserManager;
 import android.provider.Settings;
@@ -34,7 +36,6 @@ import android.view.View.OnLongClickListener;
 import android.view.ViewGroup;
 import android.view.ViewTreeObserver.OnGlobalLayoutListener;
 import android.view.accessibility.AccessibilityManager;
-
 import com.android.launcher3.util.Thunk;
 
 class LauncherClings implements OnClickListener {
@@ -212,6 +213,7 @@ class LauncherClings implements OnClickListener {
     }
 
     /** Returns whether the clings are enabled or should be shown */
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
     private boolean areClingsEnabled() {
         if (DISABLE_CLINGS) {
             return false;
diff --git a/src/com/android/launcher3/LauncherStateTransitionAnimation.java b/src/com/android/launcher3/LauncherStateTransitionAnimation.java
index 73ae51c3e..324375444 100644
--- a/src/com/android/launcher3/LauncherStateTransitionAnimation.java
+++ b/src/com/android/launcher3/LauncherStateTransitionAnimation.java
@@ -22,16 +22,17 @@ import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.PropertyValuesHolder;
 import android.animation.TimeInterpolator;
+import android.annotation.SuppressLint;
+import android.annotation.TargetApi;
 import android.content.res.Resources;
+import android.os.Build;
 import android.util.Log;
 import android.view.View;
 import android.view.ViewAnimationUtils;
 import android.view.animation.AccelerateInterpolator;
 import android.view.animation.DecelerateInterpolator;
-
 import com.android.launcher3.util.Thunk;
 import com.android.launcher3.widget.WidgetsContainerView;
-
 import java.util.HashMap;
 
 /**
@@ -227,6 +228,7 @@ public class LauncherStateTransitionAnimation {
     /**
      * Creates and starts a new animation to a particular overlay view.
      */
+    @SuppressLint("NewApi")
     private void startAnimationToOverlay(final Workspace.State toWorkspaceState, final View toView,
              final View contentView, final View revealView, final boolean animated,
              final boolean hideSearchBar, final PrivateTransitionCallbacks pCb) {
diff --git a/src/com/android/launcher3/MemoryTracker.java b/src/com/android/launcher3/MemoryTracker.java
index 2d37c809e..067a50f97 100644
--- a/src/com/android/launcher3/MemoryTracker.java
+++ b/src/com/android/launcher3/MemoryTracker.java
@@ -101,7 +101,7 @@ public class MemoryTracker extends Service {
 
     public void startTrackingProcess(int pid, String name, long start) {
         synchronized (mLock) {
-            final Long lpid = new Long(pid);
+            final Long lpid = Long.valueOf(pid);
 
             if (mPids.contains(lpid)) return;
 
diff --git a/src/com/android/launcher3/PagedView.java b/src/com/android/launcher3/PagedView.java
index c8e7d9c0b..939615bbb 100644
--- a/src/com/android/launcher3/PagedView.java
+++ b/src/com/android/launcher3/PagedView.java
@@ -221,6 +221,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
     private static final Rect sTmpRect = new Rect();
 
     protected final Rect mInsets = new Rect();
+    protected final boolean mIsRtl;
 
     public interface PageSwitchListener {
         void onPageSwitch(View newPage, int newPageIndex);
@@ -248,6 +249,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
         a.recycle();
 
         setHapticFeedbackEnabled(false);
+        mIsRtl = Utilities.isRtl(getResources());
         init();
     }
 
@@ -403,13 +405,6 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
     }
 
     /**
-     * Note: this is a reimplementation of View.isLayoutRtl() since that is currently hidden api.
-     */
-    public boolean isLayoutRtl() {
-        return (getLayoutDirection() == LAYOUT_DIRECTION_RTL);
-    }
-
-    /**
      * Returns the index of the currently displayed page.
      */
     int getCurrentPage() {
@@ -586,16 +581,15 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
             x = Math.max(x, mFreeScrollMinScrollX);
         }
 
-        final boolean isRtl = isLayoutRtl();
         mUnboundedScrollX = x;
 
-        boolean isXBeforeFirstPage = isRtl ? (x > mMaxScrollX) : (x < 0);
-        boolean isXAfterLastPage = isRtl ? (x < 0) : (x > mMaxScrollX);
+        boolean isXBeforeFirstPage = mIsRtl ? (x > mMaxScrollX) : (x < 0);
+        boolean isXAfterLastPage = mIsRtl ? (x < 0) : (x > mMaxScrollX);
         if (isXBeforeFirstPage) {
             super.scrollTo(0, y);
             if (mAllowOverScroll) {
                 mWasInOverscroll = true;
-                if (isRtl) {
+                if (mIsRtl) {
                     overScroll(x - mMaxScrollX);
                 } else {
                     overScroll(x);
@@ -605,7 +599,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
             super.scrollTo(mMaxScrollX, y);
             if (mAllowOverScroll) {
                 mWasInOverscroll = true;
-                if (isRtl) {
+                if (mIsRtl) {
                     overScroll(x);
                 } else {
                     overScroll(x - mMaxScrollX);
@@ -844,11 +838,9 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
         // Update the viewport offsets
         mViewport.offset(offsetX,  offsetY);
 
-        final boolean isRtl = isLayoutRtl();
-
-        final int startIndex = isRtl ? childCount - 1 : 0;
-        final int endIndex = isRtl ? -1 : childCount;
-        final int delta = isRtl ? -1 : 1;
+        final int startIndex = mIsRtl ? childCount - 1 : 0;
+        final int endIndex = mIsRtl ? -1 : childCount;
+        final int delta = mIsRtl ? -1 : 1;
 
         int verticalPadding = getPaddingTop() + getPaddingBottom();
 
@@ -951,7 +943,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
     private void updateMaxScrollX() {
         int childCount = getChildCount();
         if (childCount > 0) {
-            final int index = isLayoutRtl() ? 0 : childCount - 1;
+            final int index = mIsRtl ? 0 : childCount - 1;
             mMaxScrollX = getScrollForPage(index);
         } else {
             mMaxScrollX = 0;
@@ -1261,7 +1253,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
      * Return true if a tap at (x, y) should trigger a flip to the previous page.
      */
     protected boolean hitsPreviousPage(float x, float y) {
-        if (isLayoutRtl()) {
+        if (mIsRtl) {
             return (x > (getViewportOffsetX() + getViewportWidth() -
                     getPaddingRight() - mPageSpacing));
         }
@@ -1272,7 +1264,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
      * Return true if a tap at (x, y) should trigger a flip to the next page.
      */
     protected boolean hitsNextPage(float x, float y) {
-        if (isLayoutRtl()) {
+        if (mIsRtl) {
             return (x < getViewportOffsetX() + getPaddingLeft() + mPageSpacing);
         }
         return  (x > (getViewportOffsetX() + getViewportWidth() -
@@ -1462,7 +1454,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
         final int totalDistance;
 
         int adjacentPage = page + 1;
-        if ((delta < 0 && !isLayoutRtl()) || (delta > 0 && isLayoutRtl())) {
+        if ((delta < 0 && !mIsRtl) || (delta > 0 && mIsRtl)) {
             adjacentPage = page - 1;
         }
 
@@ -1497,7 +1489,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
             int scrollOffset = 0;
             LayoutParams lp = (LayoutParams) child.getLayoutParams();
             if (!lp.isFullScreenPage) {
-                scrollOffset = isLayoutRtl() ? getPaddingRight() : getPaddingLeft();
+                scrollOffset = mIsRtl ? getPaddingRight() : getPaddingLeft();
             }
 
             int baselineX = mPageScrolls[index] + scrollOffset + getViewportOffsetX();
@@ -1574,7 +1566,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
 
     void updateFreescrollBounds() {
         getFreeScrollPageRange(mTempVisiblePagesRange);
-        if (isLayoutRtl()) {
+        if (mIsRtl) {
             mFreeScrollMinScrollX = getScrollForPage(mTempVisiblePagesRange[1]);
             mFreeScrollMaxScrollX = getScrollForPage(mTempVisiblePagesRange[0]);
         } else {
@@ -1813,9 +1805,8 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
                     // We give flings precedence over large moves, which is why we short-circuit our
                     // test for a large move if a fling has been registered. That is, a large
                     // move to the left and fling to the right will register as a fling to the right.
-                    final boolean isRtl = isLayoutRtl();
-                    boolean isDeltaXLeft = isRtl ? deltaX > 0 : deltaX < 0;
-                    boolean isVelocityXLeft = isRtl ? velocityX > 0 : velocityX < 0;
+                    boolean isDeltaXLeft = mIsRtl ? deltaX > 0 : deltaX < 0;
+                    boolean isVelocityXLeft = mIsRtl ? velocityX > 0 : velocityX < 0;
                     if (((isSignificantMove && !isDeltaXLeft && !isFling) ||
                             (isFling && !isVelocityXLeft)) && mCurrentPage > 0) {
                         finalPage = returnToOriginalPage ? mCurrentPage : mCurrentPage - 1;
@@ -1939,7 +1930,7 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
                         hscroll = event.getAxisValue(MotionEvent.AXIS_HSCROLL);
                     }
                     if (hscroll != 0 || vscroll != 0) {
-                        boolean isForwardScroll = isLayoutRtl() ? (hscroll < 0 || vscroll < 0)
+                        boolean isForwardScroll = mIsRtl ? (hscroll < 0 || vscroll < 0)
                                                          : (hscroll > 0 || vscroll > 0);
                         if (isForwardScroll) {
                             scrollRight();
diff --git a/src/com/android/launcher3/ShortcutAndWidgetContainer.java b/src/com/android/launcher3/ShortcutAndWidgetContainer.java
index 56c8b39b6..490ed6a73 100644
--- a/src/com/android/launcher3/ShortcutAndWidgetContainer.java
+++ b/src/com/android/launcher3/ShortcutAndWidgetContainer.java
@@ -170,11 +170,7 @@ public class ShortcutAndWidgetContainer extends ViewGroup {
     }
 
     public boolean invertLayoutHorizontally() {
-        return mInvertIfRtl && isLayoutRtl();
-    }
-
-    public boolean isLayoutRtl() {
-        return (getLayoutDirection() == LAYOUT_DIRECTION_RTL);
+        return mInvertIfRtl && Utilities.isRtl(getResources());
     }
 
     @Override
diff --git a/src/com/android/launcher3/UninstallDropTarget.java b/src/com/android/launcher3/UninstallDropTarget.java
index c3511358d..0fc8f324a 100644
--- a/src/com/android/launcher3/UninstallDropTarget.java
+++ b/src/com/android/launcher3/UninstallDropTarget.java
@@ -1,5 +1,6 @@
 package com.android.launcher3;
 
+import android.annotation.TargetApi;
 import android.content.ComponentName;
 import android.content.Context;
 import android.os.Build;
@@ -7,7 +8,6 @@ import android.os.Bundle;
 import android.os.UserManager;
 import android.util.AttributeSet;
 import android.util.Pair;
-
 import com.android.launcher3.R;
 import com.android.launcher3.compat.UserHandleCompat;
 import com.android.launcher3.util.Thunk;
@@ -36,6 +36,7 @@ public class UninstallDropTarget extends ButtonDropTarget {
         return supportsDrop(getContext(), info);
     }
 
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
     public static boolean supportsDrop(Context context, Object info) {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
             UserManager userManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index 298174768..f3435fc5c 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -631,4 +631,10 @@ public final class Utilities {
         Matcher m = sTrimPattern.matcher(s);
         return m.replaceAll("$1");
     }
+
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
+    public static boolean isRtl(Resources res) {
+        return (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) &&
+                (res.getConfiguration().getLayoutDirection() == View.LAYOUT_DIRECTION_RTL);
+    }
 }
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index 4004b1d90..58e5877a6 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -21,6 +21,7 @@ import android.animation.AnimatorListenerAdapter;
 import android.animation.LayoutTransition;
 import android.animation.ObjectAnimator;
 import android.animation.PropertyValuesHolder;
+import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.WallpaperManager;
 import android.appwidget.AppWidgetHostView;
@@ -56,7 +57,6 @@ import android.view.accessibility.AccessibilityManager;
 import android.view.animation.DecelerateInterpolator;
 import android.view.animation.Interpolator;
 import android.widget.TextView;
-
 import com.android.launcher3.FolderIcon.FolderRingAnimator;
 import com.android.launcher3.Launcher.CustomContentCallbacks;
 import com.android.launcher3.Launcher.LauncherOverlay;
@@ -70,7 +70,6 @@ import com.android.launcher3.util.Thunk;
 import com.android.launcher3.util.WallpaperUtils;
 import com.android.launcher3.widget.PendingAddShortcutInfo;
 import com.android.launcher3.widget.PendingAddWidgetInfo;
-
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -553,8 +552,10 @@ public class Workspace extends SmoothPagedView
             throw new RuntimeException("Screen id " + screenId + " already exists!");
         }
 
-        CellLayout newScreen = (CellLayout)
-                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, null);
+        // Inflate the cell layout, but do not add it automatically so that we can get the newly
+        // created CellLayout.
+        CellLayout newScreen = (CellLayout) mLauncher.getLayoutInflater().inflate(
+                        R.layout.workspace_screen, this, false /* attachToRoot */);
 
         newScreen.setOnLongClickListener(mLongClickListener);
         newScreen.setOnClickListener(mLauncher);
@@ -573,7 +574,7 @@ public class Workspace extends SmoothPagedView
 
     public void createCustomContentContainer() {
         CellLayout customScreen = (CellLayout)
-                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, null);
+                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, this, false);
         customScreen.disableBackground();
         customScreen.disableDragTarget();
 
@@ -1033,6 +1034,7 @@ public class Workspace extends SmoothPagedView
      * listener via setOnInterceptTouchEventListener(). This allows us to tell the CellLayout
      * that it should intercept touch events, which is not something that is normally supported.
      */
+    @SuppressLint("ClickableViewAccessibility")
     @Override
     public boolean onTouch(View v, MotionEvent event) {
         return (workspaceInModalState() || !isFinishedSwitchingState())
@@ -1136,7 +1138,7 @@ public class Workspace extends SmoothPagedView
         boolean passRightSwipesToCustomContent =
                 (mTouchDownTime - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;
 
-        boolean swipeInIgnoreDirection = isLayoutRtl() ? deltaX < 0 : deltaX > 0;
+        boolean swipeInIgnoreDirection = mIsRtl ? deltaX < 0 : deltaX > 0;
         boolean onCustomContentScreen =
                 getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID;
         if (swipeInIgnoreDirection && onCustomContentScreen && passRightSwipesToCustomContent) {
@@ -1243,15 +1245,14 @@ public class Workspace extends SmoothPagedView
 
     @Override
     protected void overScroll(float amount) {
-        boolean isRtl = isLayoutRtl();
-        boolean shouldOverScroll = (amount <= 0 && (!hasCustomContent() || isRtl)) ||
-                (amount >= 0 && (!hasCustomContent() || !isRtl));
+        boolean shouldOverScroll = (amount <= 0 && (!hasCustomContent() || mIsRtl)) ||
+                (amount >= 0 && (!hasCustomContent() || !mIsRtl));
 
         boolean shouldScrollOverlay = mLauncherOverlay != null &&
-                ((amount <= 0 && !isRtl) || (amount >= 0 && isRtl));
+                ((amount <= 0 && !mIsRtl) || (amount >= 0 && mIsRtl));
 
         boolean shouldZeroOverlay = mLauncherOverlay != null && mLastOverlaySroll != 0 &&
-                ((amount >= 0 && !isRtl) || (amount <= 0 && isRtl));
+                ((amount >= 0 && !mIsRtl) || (amount <= 0 && mIsRtl));
 
         if (shouldScrollOverlay) {
             if (!mStartedSendingScrollEvents && mScrollInteractionBegan) {
@@ -1265,7 +1266,7 @@ public class Workspace extends SmoothPagedView
             int progress = (int) Math.abs((f * 100));
 
             mLastOverlaySroll = progress;
-            mLauncherOverlay.onScrollChange(progress, isRtl);
+            mLauncherOverlay.onScrollChange(progress, mIsRtl);
         } else if (shouldOverScroll) {
             dampedOverScroll(amount);
             mOverScrollEffect = acceleratedOverFactor(amount);
@@ -1274,7 +1275,7 @@ public class Workspace extends SmoothPagedView
         }
 
         if (shouldZeroOverlay) {
-            mLauncherOverlay.onScrollChange(0, isRtl);
+            mLauncherOverlay.onScrollChange(0, mIsRtl);
         }
     }
 
@@ -1409,7 +1410,7 @@ public class Workspace extends SmoothPagedView
             mNumPagesForWallpaperParallax = parallaxPageSpan;
 
             if (getChildCount() <= 1) {
-                if (isLayoutRtl()) {
+                if (mIsRtl) {
                     return 1 - 1.0f/mNumPagesForWallpaperParallax;
                 }
                 return 0;
@@ -1420,7 +1421,7 @@ public class Workspace extends SmoothPagedView
             int firstIndex = numCustomPages();
             // Exclude the last extra empty screen (if we have > MIN_PARALLAX_PAGE_SPAN pages)
             int lastIndex = getChildCount() - 1 - emptyExtraPages;
-            if (isLayoutRtl()) {
+            if (mIsRtl) {
                 int temp = firstIndex;
                 firstIndex = lastIndex;
                 lastIndex = temp;
@@ -1441,7 +1442,7 @@ public class Workspace extends SmoothPagedView
                 // On RTL devices, push the wallpaper offset to the right if we don't have enough
                 // pages (ie if numScrollingPages < MIN_PARALLAX_PAGE_SPAN)
                 if (!mWallpaperIsLiveWallpaper && numScrollingPages < MIN_PARALLAX_PAGE_SPAN
-                        && isLayoutRtl()) {
+                        && mIsRtl) {
                     return offset * (parallaxPageSpan - numScrollingPages + 1) / parallaxPageSpan;
                 }
                 return offset * (numScrollingPages - 1) / parallaxPageSpan;
@@ -1648,7 +1649,7 @@ public class Workspace extends SmoothPagedView
             translationX = scrollRange - scrollDelta;
             progress = (scrollRange - scrollDelta) / scrollRange;
 
-            if (isLayoutRtl()) {
+            if (mIsRtl) {
                 translationX = Math.min(0, translationX);
             } else {
                 translationX = Math.max(0, translationX);
@@ -1702,7 +1703,6 @@ public class Workspace extends SmoothPagedView
 
     @Override
     protected void screenScrolled(int screenCenter) {
-        final boolean isRtl = isLayoutRtl();
         super.screenScrolled(screenCenter);
 
         updatePageAlphaValues(screenCenter);
@@ -1717,7 +1717,7 @@ public class Workspace extends SmoothPagedView
             final int upperIndex = getChildCount() - 1;
 
             final boolean isLeftPage = mOverScrollX < 0;
-            index = (!isRtl && isLeftPage) || (isRtl && !isLeftPage) ? lowerIndex : upperIndex;
+            index = (!mIsRtl && isLeftPage) || (mIsRtl && !isLeftPage) ? lowerIndex : upperIndex;
 
             CellLayout cl = (CellLayout) getChildAt(index);
             float effect = Math.abs(mOverScrollEffect);
diff --git a/src/com/android/launcher3/accessibility/OverviewScreenAccessibilityDelegate.java b/src/com/android/launcher3/accessibility/OverviewScreenAccessibilityDelegate.java
index d3f5230b2..c5b52de72 100644
--- a/src/com/android/launcher3/accessibility/OverviewScreenAccessibilityDelegate.java
+++ b/src/com/android/launcher3/accessibility/OverviewScreenAccessibilityDelegate.java
@@ -16,17 +16,20 @@
 
 package com.android.launcher3.accessibility;
 
+import android.annotation.TargetApi;
 import android.content.Context;
+import android.os.Build;
 import android.os.Bundle;
 import android.util.SparseArray;
 import android.view.View;
 import android.view.View.AccessibilityDelegate;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
-
 import com.android.launcher3.R;
+import com.android.launcher3.Utilities;
 import com.android.launcher3.Workspace;
 
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
 public class OverviewScreenAccessibilityDelegate extends AccessibilityDelegate {
 
     private static final int MOVE_BACKWARD = R.id.action_move_screen_backwards;
@@ -39,7 +42,7 @@ public class OverviewScreenAccessibilityDelegate extends AccessibilityDelegate {
         mWorkspace = workspace;
 
         Context context = mWorkspace.getContext();
-        boolean isRtl = mWorkspace.isLayoutRtl();
+        boolean isRtl = Utilities.isRtl(context.getResources());
         mActions.put(MOVE_BACKWARD, new AccessibilityAction(MOVE_BACKWARD,
                 context.getText(isRtl ? R.string.action_move_screen_right :
                     R.string.action_move_screen_left)));
diff --git a/src/com/android/launcher3/compat/AppWidgetManagerCompatV16.java b/src/com/android/launcher3/compat/AppWidgetManagerCompatV16.java
index 967b53b0b..8cecb9602 100644
--- a/src/com/android/launcher3/compat/AppWidgetManagerCompatV16.java
+++ b/src/com/android/launcher3/compat/AppWidgetManagerCompatV16.java
@@ -16,6 +16,7 @@
 
 package com.android.launcher3.compat;
 
+import android.annotation.TargetApi;
 import android.app.Activity;
 import android.appwidget.AppWidgetHost;
 import android.appwidget.AppWidgetManager;
@@ -49,6 +50,7 @@ class AppWidgetManagerCompatV16 extends AppWidgetManagerCompat {
         return Utilities.trim(info.label);
     }
 
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
     @Override
     public boolean bindAppWidgetIdIfAllowed(int appWidgetId, AppWidgetProviderInfo info,
             Bundle options) {
diff --git a/src/com/android/launcher3/compat/LauncherActivityInfoCompatVL.java b/src/com/android/launcher3/compat/LauncherActivityInfoCompatVL.java
index b52cf1de2..4448758e7 100644
--- a/src/com/android/launcher3/compat/LauncherActivityInfoCompatVL.java
+++ b/src/com/android/launcher3/compat/LauncherActivityInfoCompatVL.java
@@ -16,12 +16,14 @@
 
 package com.android.launcher3.compat;
 
+import android.annotation.TargetApi;
 import android.content.ComponentName;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.LauncherActivityInfo;
 import android.graphics.drawable.Drawable;
-import android.os.UserHandle;
+import android.os.Build;
 
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
 public class LauncherActivityInfoCompatVL extends LauncherActivityInfoCompat {
     private LauncherActivityInfo mLauncherActivityInfo;
 
diff --git a/src/com/android/launcher3/compat/LauncherAppsCompatVL.java b/src/com/android/launcher3/compat/LauncherAppsCompatVL.java
index e0d28b566..c862ffc0a 100644
--- a/src/com/android/launcher3/compat/LauncherAppsCompatVL.java
+++ b/src/com/android/launcher3/compat/LauncherAppsCompatVL.java
@@ -16,6 +16,7 @@
 
 package com.android.launcher3.compat;
 
+import android.annotation.TargetApi;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
@@ -32,6 +33,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
 public class LauncherAppsCompatVL extends LauncherAppsCompat {
 
     private LauncherApps mLauncherApps;
diff --git a/src/com/android/launcher3/compat/PackageInstallerCompatVL.java b/src/com/android/launcher3/compat/PackageInstallerCompatVL.java
index 395d5f9e2..3ad51017d 100644
--- a/src/com/android/launcher3/compat/PackageInstallerCompatVL.java
+++ b/src/com/android/launcher3/compat/PackageInstallerCompatVL.java
@@ -16,10 +16,12 @@
 
 package com.android.launcher3.compat;
 
+import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.pm.PackageInstaller;
 import android.content.pm.PackageInstaller.SessionCallback;
 import android.content.pm.PackageInstaller.SessionInfo;
+import android.os.Build;
 import android.os.Handler;
 import android.util.SparseArray;
 
@@ -30,6 +32,7 @@ import com.android.launcher3.util.Thunk;
 
 import java.util.HashMap;
 
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
 public class PackageInstallerCompatVL extends PackageInstallerCompat {
 
     @Thunk final SparseArray<String> mActiveSessions = new SparseArray<>();
diff --git a/src/com/android/launcher3/compat/UserHandleCompat.java b/src/com/android/launcher3/compat/UserHandleCompat.java
index 2ae673171..d8e60b875 100644
--- a/src/com/android/launcher3/compat/UserHandleCompat.java
+++ b/src/com/android/launcher3/compat/UserHandleCompat.java
@@ -16,10 +16,10 @@
 
 package com.android.launcher3.compat;
 
+import android.annotation.TargetApi;
 import android.content.Intent;
 import android.os.Build;
 import android.os.UserHandle;
-
 import com.android.launcher3.Utilities;
 
 public class UserHandleCompat {
@@ -32,6 +32,7 @@ public class UserHandleCompat {
     private UserHandleCompat() {
     }
 
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
     public static UserHandleCompat myUserHandle() {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
             return new UserHandleCompat(android.os.Process.myUserHandle());
diff --git a/src/com/android/launcher3/compat/UserManagerCompatV17.java b/src/com/android/launcher3/compat/UserManagerCompatV17.java
index 055359afe..c42c00c7d 100644
--- a/src/com/android/launcher3/compat/UserManagerCompatV17.java
+++ b/src/com/android/launcher3/compat/UserManagerCompatV17.java
@@ -16,14 +16,12 @@
 
 package com.android.launcher3.compat;
 
+import android.annotation.TargetApi;
 import android.content.Context;
-import android.graphics.drawable.Drawable;
-import android.os.UserHandle;
+import android.os.Build;
 import android.os.UserManager;
 
-import java.util.ArrayList;
-import java.util.List;
-
+@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
 public class UserManagerCompatV17 extends UserManagerCompatV16 {
     protected UserManager mUserManager;
 
diff --git a/src/com/android/launcher3/compat/UserManagerCompatVL.java b/src/com/android/launcher3/compat/UserManagerCompatVL.java
index 884d6fe2a..f6434c5b2 100644
--- a/src/com/android/launcher3/compat/UserManagerCompatVL.java
+++ b/src/com/android/launcher3/compat/UserManagerCompatVL.java
@@ -17,18 +17,19 @@
 
 package com.android.launcher3.compat;
 
+import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.graphics.drawable.Drawable;
+import android.os.Build;
 import android.os.UserHandle;
-
 import com.android.launcher3.LauncherAppState;
-
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
 public class UserManagerCompatVL extends UserManagerCompatV17 {
     private static final String USER_CREATION_TIME_KEY = "user_creation_time_";
 
diff --git a/src/com/android/launcher3/widget/WidgetsListAdapter.java b/src/com/android/launcher3/widget/WidgetsListAdapter.java
index d6e062874..84884c4fa 100644
--- a/src/com/android/launcher3/widget/WidgetsListAdapter.java
+++ b/src/com/android/launcher3/widget/WidgetsListAdapter.java
@@ -15,8 +15,10 @@
  */
 package com.android.launcher3.widget;
 
+import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.pm.ResolveInfo;
+import android.os.Build;
 import android.support.v7.widget.RecyclerView;
 import android.content.res.Resources;
 import android.support.v7.widget.RecyclerView.Adapter;
@@ -27,9 +29,7 @@ import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 import android.view.ViewGroup.MarginLayoutParams;
 import android.widget.LinearLayout;
-
 import com.android.launcher3.BubbleTextView;
-
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.DynamicGrid;
 import com.android.launcher3.IconCache;
@@ -38,7 +38,6 @@ import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.LauncherAppWidgetProviderInfo;
 import com.android.launcher3.R;
 import com.android.launcher3.WidgetPreviewLoader;
-
 import java.util.List;
 
 /**
@@ -157,6 +156,7 @@ public class WidgetsListAdapter extends Adapter<WidgetsRowViewHolder> {
         }
     }
 
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
     @Override
     public WidgetsRowViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         if (DEBUG) {
@@ -167,7 +167,11 @@ public class WidgetsListAdapter extends Adapter<WidgetsRowViewHolder> {
                 R.layout.widgets_list_row_view, parent, false);
         LinearLayout cellList = (LinearLayout) container.findViewById(R.id.widgets_cell_list);
         MarginLayoutParams lp = (MarginLayoutParams) cellList.getLayoutParams();
-        lp.setMarginStart(mIndent);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
+            lp.setMarginStart(mIndent);
+        } else {
+            lp.leftMargin = mIndent;
+        }
         cellList.setLayoutParams(lp);
         return new WidgetsRowViewHolder(container);
     }