title: Set the Drawable icon of other app to the notification builder
body: <p>I am working on application, In that application I am getting other application info. And the info show on the notification builder.
  I am getting the other application icon, and want to show on the notification. But the getting info contain drawable image.</p>
  
  <p>So, how can I show the draw able image on the notification.
  Here is my sample of code.</p>
  
  <pre><code> String packageName=appSetting.getHeavyDrainingAppName();
  
   ApplicationInfo app = getPackageManager().getApplicationInfo(packageName, PackageManager.GET_META_DATA);
  
   int iconId = ......????
  
  
  
   NotificationCompat.Builder mBuilder =
                              new NotificationCompat.Builder(context)
                                      .setSmallIcon(iconId)
                                      .setContentTitle(getResources().getString(R.string.heavy_drain_text))
                                      .setContentText("Tap to stop")
                                      .setOngoing(true);
  </code></pre>