title: can't click install button while using "SYSTEM_ALERT_WINDOW" permission
body: <p>can't click install button while use my app.</p>
  
  <p>I use SYSTEM_ALERT_WINDOW permission.</p>
  
  <p>Below my code:</p>
  
  <pre><code>new WindowManager.LayoutParams( WindowManager.LayoutParams.FILL_PARENT,
                   WindowManager.LayoutParams.FILL_PARENT,
                   WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
                   WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH |
                   WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,
                   PixelFormat.TRANSLUCENT);
  </code></pre>
  
  <p>If use my app, Can't click install button while install apk file.</p>
  
  <p>how can i use install button?</p>