Use correct WindowManager for Toast.

The WindowManager retrieved from the activity Context with
getSystemService is incorrect for a Toast. Because it contains
a parent window when addView is called its LayoutParams.token
is set to the value of the parent window. Then when an Activity
is dismissed WindowManagerGlobal.closeAll() sees the incorrect
token and incorrectly closes the Toast.

This fix uses the application Context instead of the activity
Context to retrieve a WindowManager with no parent window. This
leaves the token unchanged and keeps from dismissing the toast when
the activity is closed.

Fixes bug 7048792.

Change-Id: I92c3095d8fabd6e9e4206e9bc8e917885ab322a9

Author: Craig Mautner

core/java/android/widget/Toast.java

@@ -305,12 +305,14 @@ static private INotificationManager getService() {
 
     private static class TN extends ITransientNotification.Stub {
         final Runnable mShow = new Runnable() {
+            @Override
             public void run() {
                 handleShow();
             }
         };
 
         final Runnable mHide = new Runnable() {
+            @Override
             public void run() {
                 handleHide();
                 // Don't do this in handleHide() because it is also invoked by handleShow()
@@ -329,7 +331,7 @@ public void run() {
 
         View mView;
         View mNextView;
-        
+
         WindowManager mWM;
 
         TN() {
@@ -350,6 +352,7 @@ public void run() {
         /**
          * schedule handleShow into the right thread
          */
+        @Override
         public void show() {
             if (localLOGV) Log.v(TAG, "SHOW: " + this);
             mHandler.post(mShow);
@@ -358,6 +361,7 @@ public void show() {
         /**
          * schedule handleHide into the right thread
          */
+        @Override
         public void hide() {
             if (localLOGV) Log.v(TAG, "HIDE: " + this);
             mHandler.post(mHide);
@@ -370,7 +374,8 @@ public void handleShow() {
                 // remove the old view if necessary
                 handleHide();
                 mView = mNextView;
-                mWM = (WindowManager)mView.getContext().getSystemService(Context.WINDOW_SERVICE);
+                mWM = (WindowManager)mView.getContext().getApplicationContext()
+                        .getSystemService(Context.WINDOW_SERVICE);
                 // We can resolve the Gravity here by using the Locale for getting
                 // the layout direction
                 final Configuration config = mView.getContext().getResources().getConfiguration();