title: How to start a notification in IntentService
body: <p>I'm try to send a notification when a user enters or exits a specific geofence.
  I already can log when a user enters or exits the geofence. But no notification is showed up when this happened. Is there anything i'm missing? I implemented a theme in my manifestfile.</p>
  
  <p>I also updated my manifest like :</p>
  
  <pre><code> &lt;activity
              android:name=".HomeActivity"
              android:screenOrientation="portrait"
              android:configChanges="keyboardHidden|orientation"
              android:label="@string/app_name"
              android:theme="@android:style/Theme.Holo.Light"&gt;
              &lt;intent-filter&gt;
                  &lt;action android:name="android.intent.action.MAIN" /&gt;
  
                  &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
              &lt;/intent-filter&gt;
          &lt;/activity&gt;
  </code></pre>
  
  <p>Here is my GeofenceIntentService, </p>
  
  <pre><code>public class GeofenceIntentService extends IntentService {
  
      private NotificationManager mNotificationManager;
      public static final int NOTIFICATION_ID = 1;
      public static final String TRANSITION_INTENT_SERVICE = "ReceiveTransitionsIntentService";
  
      public GeofenceIntentService() {
          super(TRANSITION_INTENT_SERVICE);
      }
  
      @Override
      protected void onHandleIntent(Intent intent) {
          if (LocationClient.hasError(intent)) {
              //todo error process
          } else {
              int transitionType = LocationClient.getGeofenceTransition(intent);
              if (transitionType == Geofence.GEOFENCE_TRANSITION_ENTER ||
                      transitionType == Geofence.GEOFENCE_TRANSITION_EXIT) {
                  List&lt;Geofence&gt; triggerList = LocationClient.getTriggeringGeofences(intent);
  
                  for (Geofence geofence : triggerList) {
                      String locationId = geofence.getRequestId();
                      int value = transitionType;
                      String geofenceStatus;
                      if(value == 1){
                          Log.i("**************************************", "Entered geofence");
                          sendNotification("entering");
  
  
                      }else if(value == 2){
                          Log.i("**************************************", "Exiting geofence");
                          sendNotification("exiting");
                      }
                  }
              }
          }
      }
  
      private void sendNotification(String msg) {
          mNotificationManager = (NotificationManager)
                  this.getSystemService(Context.NOTIFICATION_SERVICE);
  
          PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
                  new Intent(this, HomeActivity.class), 0);
  
          NotificationCompat.Builder mBuilder =
                  new NotificationCompat.Builder(this)
                          .setContentTitle("GCM Notification")
                          .setStyle(new NotificationCompat.BigTextStyle()
                                  .bigText(msg))
                          .setContentText(msg);
          mBuilder.setContentIntent(contentIntent);
          mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
      }
  
  }
  </code></pre>
  
  <p>Anyone have some ideas how to get this working? My main activity class is HomeActivity.</p>