Update suggested wallpaper dimensions in onResume

If another launcher runs in between, it might
change the suggested dimensions. This fixes that
case.

Bug: 11667475
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 901b638..1e418ec 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -160,6 +160,13 @@
             </intent-filter>
         </receiver>
 
+        <receiver
+            android:name="com.android.launcher3.WallpaperChangedReceiver">
+            <intent-filter>
+                <action android:name="android.intent.action.WALLPAPER_CHANGED" />
+            </intent-filter>
+        </receiver>
+
         <!-- Intent received used to install shortcuts from other applications -->
         <receiver
             android:name="com.android.launcher3.InstallShortcutReceiver"
diff --git a/src/com/android/launcher3/LauncherAppState.java b/src/com/android/launcher3/LauncherAppState.java
index 9a47eaa..5daa845 100644
--- a/src/com/android/launcher3/LauncherAppState.java
+++ b/src/com/android/launcher3/LauncherAppState.java
@@ -39,6 +39,7 @@
     private boolean mIsScreenLarge;
     private float mScreenDensity;
     private int mLongPressTimeout = 300;
+    private boolean mWallpaperChangedSinceLastCheck;
 
     private static WeakReference<LauncherProvider> sLauncherProvider;
     private static Context sContext;
@@ -217,6 +218,16 @@
         return mLongPressTimeout;
     }
 
+    public void onWallpaperChanged() {
+        mWallpaperChangedSinceLastCheck = true;
+    }
+
+    public boolean hasWallpaperChangedSinceLastCheck() {
+        boolean result = mWallpaperChangedSinceLastCheck;
+        mWallpaperChangedSinceLastCheck = false;
+        return result;
+    }
+
     @Override
     public void onAvailableSizeChanged(DeviceProfile grid) {
         Utilities.setIconSize(grid.iconSizePx);
diff --git a/src/com/android/launcher3/WallpaperChangedReceiver.java b/src/com/android/launcher3/WallpaperChangedReceiver.java
new file mode 100644
index 0000000..28e41d8
--- /dev/null
+++ b/src/com/android/launcher3/WallpaperChangedReceiver.java
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 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.
+ */
+
+package com.android.launcher3;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+public class WallpaperChangedReceiver extends BroadcastReceiver {
+    public void onReceive(Context context, Intent data) {
+        LauncherAppState appState = LauncherAppState.getInstance();
+        appState.onWallpaperChanged();
+    }
+}
diff --git a/src/com/android/launcher3/WallpaperCropActivity.java b/src/com/android/launcher3/WallpaperCropActivity.java
index 2102599..b3ef073 100644
--- a/src/com/android/launcher3/WallpaperCropActivity.java
+++ b/src/com/android/launcher3/WallpaperCropActivity.java
@@ -71,6 +71,8 @@
     public static final int MAX_BMAP_IN_INTENT = 750000;
     private static final float WALLPAPER_SCREENS_SPAN = 2f;
 
+    protected static Point sDefaultWallpaperSize;
+
     protected CropView mCropView;
     protected Uri mUri;
 
@@ -204,32 +206,34 @@
     }
 
     static protected Point getDefaultWallpaperSize(Resources res, WindowManager windowManager) {
-        Point minDims = new Point();
-        Point maxDims = new Point();
-        windowManager.getDefaultDisplay().getCurrentSizeRange(minDims, maxDims);
+        if (sDefaultWallpaperSize == null) {
+            Point minDims = new Point();
+            Point maxDims = new Point();
+            windowManager.getDefaultDisplay().getCurrentSizeRange(minDims, maxDims);
 
-        int maxDim = Math.max(maxDims.x, maxDims.y);
-        int minDim = Math.max(minDims.x, minDims.y);
+            int maxDim = Math.max(maxDims.x, maxDims.y);
+            int minDim = Math.max(minDims.x, minDims.y);
 
-        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1) {
-            Point realSize = new Point();
-            windowManager.getDefaultDisplay().getRealSize(realSize);
-            maxDim = Math.max(realSize.x, realSize.y);
-            minDim = Math.min(realSize.x, realSize.y);
+            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1) {
+                Point realSize = new Point();
+                windowManager.getDefaultDisplay().getRealSize(realSize);
+                maxDim = Math.max(realSize.x, realSize.y);
+                minDim = Math.min(realSize.x, realSize.y);
+            }
+
+            // We need to ensure that there is enough extra space in the wallpaper
+            // for the intended parallax effects
+            final int defaultWidth, defaultHeight;
+            if (isScreenLarge(res)) {
+                defaultWidth = (int) (maxDim * wallpaperTravelToScreenWidthRatio(maxDim, minDim));
+                defaultHeight = maxDim;
+            } else {
+                defaultWidth = Math.max((int) (minDim * WALLPAPER_SCREENS_SPAN), maxDim);
+                defaultHeight = maxDim;
+            }
+            sDefaultWallpaperSize = new Point(defaultWidth, defaultHeight);
         }
-
-        // We need to ensure that there is enough extra space in the wallpaper
-        // for the intended
-        // parallax effects
-        final int defaultWidth, defaultHeight;
-        if (isScreenLarge(res)) {
-            defaultWidth = (int) (maxDim * wallpaperTravelToScreenWidthRatio(maxDim, minDim));
-            defaultHeight = maxDim;
-        } else {
-            defaultWidth = Math.max((int) (minDim * WALLPAPER_SCREENS_SPAN), maxDim);
-            defaultHeight = maxDim;
-        }
-        return new Point(defaultWidth, defaultHeight);
+        return sDefaultWallpaperSize;
     }
 
     public static int getRotationFromExif(String path) {
@@ -785,16 +789,13 @@
             WindowManager windowManager,
             final WallpaperManager wallpaperManager) {
         final Point defaultWallpaperSize = getDefaultWallpaperSize(res, windowManager);
-
-        new AsyncTask<Void, Void, Void>() {
-            public Void doInBackground(Void ... args) {
-                // If we have saved a wallpaper width/height, use that instead
-                int savedWidth = sharedPrefs.getInt(WALLPAPER_WIDTH_KEY, defaultWallpaperSize.x);
-                int savedHeight = sharedPrefs.getInt(WALLPAPER_HEIGHT_KEY, defaultWallpaperSize.y);
-                wallpaperManager.suggestDesiredDimensions(savedWidth, savedHeight);
-                return null;
-            }
-        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void) null);
+        // If we have saved a wallpaper width/height, use that instead
+        int savedWidth = sharedPrefs.getInt(WALLPAPER_WIDTH_KEY, defaultWallpaperSize.x);
+        int savedHeight = sharedPrefs.getInt(WALLPAPER_HEIGHT_KEY, defaultWallpaperSize.y);
+        if (savedWidth != wallpaperManager.getDesiredMinimumWidth() ||
+                savedHeight != wallpaperManager.getDesiredMinimumHeight()) {
+            wallpaperManager.suggestDesiredDimensions(savedWidth, savedHeight);
+        }
     }
 
     protected static RectF getMaxCropRect(
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index e4ba743..936d573 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -43,6 +43,7 @@
 import android.graphics.Region.Op;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
+import android.os.AsyncTask;
 import android.os.IBinder;
 import android.os.Parcelable;
 import android.support.v4.view.ViewCompat;
@@ -437,6 +438,9 @@
 
         mMaxDistanceForFolderCreation = (0.55f * grid.iconSizePx);
         mFlingThresholdVelocity = (int) (FLING_THRESHOLD_VELOCITY * mDensity);
+
+        // Set the wallpaper dimensions when Launcher starts up
+        setWallpaperDimension();
     }
 
     private void setupLayoutTransition() {
@@ -1232,10 +1236,16 @@
     }
 
     protected void setWallpaperDimension() {
-        String spKey = WallpaperCropActivity.getSharedPreferencesKey();
-        SharedPreferences sp = mLauncher.getSharedPreferences(spKey, Context.MODE_MULTI_PROCESS);
-        WallpaperPickerActivity.suggestWallpaperDimension(mLauncher.getResources(),
-                sp, mLauncher.getWindowManager(), mWallpaperManager);
+        new AsyncTask<Void, Void, Void>() {
+            public Void doInBackground(Void ... args) {
+                String spKey = WallpaperCropActivity.getSharedPreferencesKey();
+                SharedPreferences sp =
+                        mLauncher.getSharedPreferences(spKey, Context.MODE_MULTI_PROCESS);
+                WallpaperPickerActivity.suggestWallpaperDimension(mLauncher.getResources(),
+                        sp, mLauncher.getWindowManager(), mWallpaperManager);
+                return null;
+            }
+        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void) null);
     }
 
     protected void snapToPage(int whichPage, Runnable r) {
@@ -1693,6 +1703,12 @@
         AccessibilityManager am = (AccessibilityManager)
                 getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
         sAccessibilityEnabled = am.isEnabled();
+
+        // Update wallpaper dimensions if they were changed since last onResume
+        // (we also always set the wallpaper dimensions in the constructor)
+        if (LauncherAppState.getInstance().hasWallpaperChangedSinceLastCheck()) {
+            setWallpaperDimension();
+        }
     }
 
     @Override
@@ -4001,7 +4017,6 @@
         // hardware layers on children are enabled on startup, but should be disabled until
         // needed
         updateChildrenLayersEnabled(false);
-        setWallpaperDimension();
     }
 
     /**