title: Show Dialog when touch notification on Android
body: <p>I already built push notification by using Firebase Cloud Messaging on Eclipse Project. Now I want to make dialog with OK button when I touch the notification on status bar.</p>
  
  <p>Can anyone help me? or suggest how to handle it? 
  FYI, anytime (when the apps on background or in foreground) if I touch the notification on top it will show a dialog box.</p>
  
  <p>Many thanks.</p>