Fix transition into Recents with live wallpaper

Fixes regression introduced by:
738cfc9
(Fixing wallpaper flash when going in/out of Recents)

Author: mikejurka

packages/SystemUI/src/com/android/systemui/recent/RecentsActivity.java

@@ -113,10 +113,14 @@ private void updateWallpaperVisibility(boolean visible) {
         }
     }
 
+    public static boolean forceOpaqueBackground(Context context) {
+        return WallpaperManager.getInstance(context).getWallpaperInfo() != null;
+    }
+
     @Override
     public void onStart() {
         // Hide wallpaper if it's not a static image
-        if (WallpaperManager.getInstance(this).getWallpaperInfo() != null) {
+        if (forceOpaqueBackground(this)) {
             updateWallpaperVisibility(false);
         } else {
             updateWallpaperVisibility(true);

packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java

@@ -36,7 +36,6 @@
 import android.app.ActivityOptions;
 import android.app.KeyguardManager;
 import android.app.PendingIntent;
-import android.app.Service;
 import android.app.TaskStackBuilder;
 import android.content.ActivityNotFoundException;
 import android.content.BroadcastReceiver;
@@ -81,7 +80,6 @@
 import android.widget.TextView;
 
 import java.util.ArrayList;
-import java.util.List;
 
 public abstract class BaseStatusBar extends SystemUI implements
         CommandQueue.Callbacks {
@@ -481,9 +479,18 @@ protected void toggleRecentsActivity() {
                     | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
 
             if (firstTask == null) {
-                // The correct window animation will be applied via the activity's style
-                mContext.startActivityAsUser(intent, new UserHandle(
-                        UserHandle.USER_CURRENT));
+                if (RecentsActivity.forceOpaqueBackground(mContext)) {
+                    ActivityOptions opts = ActivityOptions.makeCustomAnimation(mContext,
+                            R.anim.recents_launch_from_launcher_enter,
+                            R.anim.recents_launch_from_launcher_exit);
+                    mContext.startActivityAsUser(intent, opts.toBundle(), new UserHandle(
+                            UserHandle.USER_CURRENT));
+                } else {
+                    // The correct window animation will be applied via the activity's style
+                    mContext.startActivityAsUser(intent, new UserHandle(
+                            UserHandle.USER_CURRENT));
+                }
+
             } else {
                 Bitmap first = firstTask.getThumbnail();
                 final Resources res = mContext.getResources();