WindowManager is unable to show Window View on screen even though it's visibility property is true
<p>My application shows UI based on events received in various BroacastReceiver .  Since I need to generate view directly from BroadcastReceiver I  use code like this :</p>

<pre><code>mWindowManager = (WindowManager) context
    .getSystemService(Context.WINDOW_SERVICE);

    WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
        LayoutParams.FILL_PARENT,
        LayoutParams.WRAP_CONTENT,
        WindowManager.LayoutParams.TYPE_TOAST, 
        WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
                | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
        PixelFormat.OPAQUE);

    TextView view = new TextView(context);

    view.setText("You got Broadcast !");

    mainView = view; 
    mWindowManager.addView(view, lp); 
Log.d("MyApp"," View shown ")
</code></pre>

<p>This code displays  TextView with text "You got Broadcast" properly when I receive BroadcastReceiver event when my main application activity is accessed beforehand. Means if my application is in memory and my main activity has been shown. </p>

<p>Now when I restart phone and my BroadcastReceiver receives event everything works fine. Infact I can see the debug statement "MyApp, View shown" in logcat. 
But strangely, actual view with text "You got Broadcast" does not appear on screen. 
Now again I launch my main activity and press home button . Now if BroadcastReceiver again receives event, it is now able to show the texview with text "You got Broadcast"  properly.</p>

<p>At present I'm not doing anything in main activity apart from showing default generated xml layout. It's dead simple code :</p>

<pre><code>public class MainActivity extends Activity {
public static final String TAG = "MainActivity";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Log.d(TAG, " Main screen");
}
</code></pre>

<p>}</p>

<p>Am I missing some screen/graphics initialization  which happens when main activity is launched ?
Or do I need to pass on any additional parameter to WindowManager ?</p>
