title: PendingIntent resume activity
body: <p>I have an Android activity that places a Notification in the status bar.  Selecting the notification will launch my main activity.  The problem is that this <code>PendingIntent</code> always starts a new instance of my activity "MyappMain".  So when i start my app by clicking on the notification, i get an new instance of the MyappMain and then i must quit/finish them all one by one (if I clicked multiple times on the notification).</p>
  
  <pre><code>     Intent notificationIntent = new Intent(this, MyappMain.class);
       PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
  
       notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
       mNotificationManager.notify(HELLO_ID, notification);
  </code></pre>