title: ShortcutBadger library implementation
body: <p>I want to implement ShortcutBadge, to show counter for push notification on my app icon.
  gotten from: <a href="https://github.com/leolin310148/ShortcutBadger" rel="nofollow noreferrer">https://github.com/leolin310148/ShortcutBadger</a></p>
  
  <p>i have added the library successfully.
  my app has GcmMessageListenerService.java class.</p>
  
  <p>and below methods.</p>
  
  <p>onMessageReceived()</p>
  
  <p>showNotification()</p>
  
  <p>i am suppose to use like this: </p>
  
  <pre><code>    int badgeCount = 1;
      ShortcutBadger.applyCount(context, badgeCount);
  </code></pre>
  
  <p>but cant get it to work when i paste above code on any of my methods on GcmMessageListenerService.java.
  Thanks for your help.</p>