title: BroadcastReceiver onReceive open dialog
body: <p>I'm building an android application with <code>BroadcastReceiver</code> and I want to show a dialog when <code>onReceive</code> starts.
  I want to show the dialog on the phone (show the user a dialog no matter where he is, like the whatsapp dialog when you get a message).</p>
  
  <p>How I can do that?</p>
  
  <p>Thanks!</p>