When the launcher is paused and we reload stuff in the background, we need to re-re-load it in onResume.

Otherwise we can load widgets and other resources from the wrong Configuration.
This doesn't completely fix the bug, but it makes it much less likely.  We tell
the launcher once at the beginning of starting a reload because of SD cards coming
back, and once when we bind.

Bug: 3126698
Change-Id: I99ee6af38bef91e261832bad4dec978a5d4a8b3d

src/com/android/launcher2/Launcher.java

@@ -194,6 +194,7 @@ public final class Launcher extends Activity
     private boolean mPaused = true;
     private boolean mRestoring;
     private boolean mWaitingForResult;
+    private boolean mOnResumeNeedsLoad;
 
     private Bundle mSavedInstanceState;
 
@@ -583,19 +584,19 @@ public final class Launcher extends Activity
     @Override
     protected void onResume() {
         super.onResume();
-
         mPaused = false;
-
-        if (mRestoring) {
+        if (mRestoring || mOnResumeNeedsLoad) {
             mWorkspaceLoading = true;
             mModel.startLoader(this, true);
             mRestoring = false;
+            mOnResumeNeedsLoad = false;
         }
     }
 
     @Override
     protected void onPause() {
         super.onPause();
+        mPaused = true;
         dismissPreview(mPreviousView);
         dismissPreview(mNextView);
         mDragController.cancelDrag();
@@ -2124,6 +2125,30 @@ public final class Launcher extends Activity
         }
     }
 
+    /**
+     * If the activity is currently paused, signal that we need to re-run the loader
+     * in onResume.
+     *
+     * This needs to be called from incoming places where resources might have been loaded
+     * while we are paused.  That is becaues the Configuration might be wrong
+     * when we're not running, and if it comes back to what it was when we
+     * were paused, we are not restarted.
+     *
+     * Implementation of the method from LauncherModel.Callbacks.
+     *
+     * @return true if we are currently paused.  The caller might be able to
+     * skip some work in that case since we will come back again.
+     */
+    public boolean setLoadOnResume() {
+        if (mPaused) {
+            Log.i(TAG, "setLoadOnResume");
+            mOnResumeNeedsLoad = true;
+            return true;
+        } else {
+            return false;
+        }
+    }
+
     /**
      * Implementation of the method from LauncherModel.Callbacks.
      */
@@ -2168,6 +2193,8 @@ public final class Launcher extends Activity
      */
     public void bindItems(ArrayList<ItemInfo> shortcuts, int start, int end) {
 
+        setLoadOnResume();
+
         final Workspace workspace = mWorkspace;
 
         for (int i=start; i<end; i++) {
@@ -2205,6 +2232,7 @@ public final class Launcher extends Activity
      * Implementation of the method from LauncherModel.Callbacks.
      */
     public void bindFolders(HashMap<Long, FolderInfo> folders) {
+        setLoadOnResume();
         sFolders.clear();
         sFolders.putAll(folders);
     }
@@ -2215,6 +2243,8 @@ public final class Launcher extends Activity
      * Implementation of the method from LauncherModel.Callbacks.
      */
     public void bindAppWidget(LauncherAppWidgetInfo item) {
+        setLoadOnResume();
+
         final long start = DEBUG_WIDGETS ? SystemClock.uptimeMillis() : 0;
         if (DEBUG_WIDGETS) {
             Log.d(TAG, "bindAppWidget: " + item);
@@ -2251,6 +2281,8 @@ public final class Launcher extends Activity
      * Implementation of the method from LauncherModel.Callbacks.
      */
     public void finishBindingItems() {
+        setLoadOnResume();
+
         if (mSavedState != null) {
             if (!mWorkspace.hasFocus()) {
                 mWorkspace.getChildAt(mWorkspace.getCurrentScreen()).requestFocus();
@@ -2296,6 +2328,7 @@ public final class Launcher extends Activity
      * Implementation of the method from LauncherModel.Callbacks.
      */
     public void bindAppsAdded(ArrayList<ApplicationInfo> apps) {
+        setLoadOnResume();
         removeDialog(DIALOG_CREATE_SHORTCUT);
         mAllAppsGrid.addApps(apps);
     }
@@ -2306,6 +2339,7 @@ public final class Launcher extends Activity
      * Implementation of the method from LauncherModel.Callbacks.
      */
     public void bindAppsUpdated(ArrayList<ApplicationInfo> apps) {
+        setLoadOnResume();
         removeDialog(DIALOG_CREATE_SHORTCUT);
         mWorkspace.updateShortcuts(apps);
         mAllAppsGrid.updateApps(apps);

src/com/android/launcher2/LauncherModel.java

@@ -96,6 +96,7 @@ public class LauncherModel extends BroadcastReceiver {
     private Bitmap mDefaultIcon;
 
     public interface Callbacks {
+        public boolean setLoadOnResume();
         public int getCurrentWorkspaceScreen();
         public void startBinding();
         public void bindItems(ArrayList<ItemInfo> shortcuts, int start, int end);
@@ -349,7 +350,19 @@ public class LauncherModel extends BroadcastReceiver {
             String[] packages = intent.getStringArrayExtra(Intent.EXTRA_CHANGED_PACKAGE_LIST);
             enqueuePackageUpdated(new PackageUpdatedTask(PackageUpdatedTask.OP_ADD, packages));
             // Then, rebind everything.
-            startLoader(mApp, false);
+            boolean runLoader = true;
+            if (mCallbacks != null) {
+                Callbacks callbacks = mCallbacks.get();
+                if (callbacks != null) {
+                    // If they're paused, we can skip loading, because they'll do it again anyway
+                    if (callbacks.setLoadOnResume()) {
+                        runLoader = false;
+                    }
+                }
+            }
+            if (runLoader) {
+                startLoader(mApp, false);
+            }
 
         } else if (Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE.equals(action)) {
             String[] packages = intent.getStringArrayExtra(Intent.EXTRA_CHANGED_PACKAGE_LIST);