title: onWindowFocusChanged not work in Lollipop?
body: <p>I'm trying to use the <code>onWindowFocusChanged</code> in application but they not support to lollipop.</p>
  
  <pre><code>@Override
  public void onWindowFocusChanged(boolean hasFocus) {
  
      super.onWindowFocusChanged(hasFocus);
      Log.e(TAG, "onWindowFocusChanged, " + hasFocus);
      mWindowhasFocus = hasFocus;
  
  }
  </code></pre>