title: open a specific activity from firebase notification
body: <p>I integrated firebase notification to my application but I would like to send a notification that opens a specific activity and does what I schedule to do, not just opening the App. like a notification that will push the user to visit Google play store on clicking it.</p>
  <p>I saw a code <a href="https://stackoverflow.com/questions/38111339/firebase-console-how-to-specify-click-action-for-notifications">Firebase console: How to specify click_action for notifications</a> which I used but am getting an error to initialize variable cls. I tried to resolve by defining cls=null,  to clear error. It fails to open my specified activity using the click_action</p>
  <pre><code>public class ClickActionHelper { 
      public static void startActivity(String className, Bundle extras, Context context){ 
          Class cls=null; 
          try { 
              cls = Class.forName(className);
          } catch (ClassNotFoundException e) { 
              //means you made a wrong input in firebase console 
          } 
          Intent i = new Intent(context, cls);
          i.putExtras(extras); context.startActivity(i); 
      }     
  }
  </code></pre>
  <p>please am I getting anything wrong? How do I get this to work?</p>