app-service-mobile-android-getting-started-with-push.md

1. In your app project, open the file AndroidManifest.xml. Add the following code after the application opening tag:

   <service android:name=".ToDoMessagingService">
       <intent-filter>
           <action android:name="com.google.firebase.MESSAGING_EVENT"/>
       </intent-filter>
   </service>
   <service android:name=".ToDoInstanceIdService">
       <intent-filter>
           <action android:name="com.google.firebase.INSTANCE_ID_EVENT"/>
       </intent-filter>
   </service>

2. Open the file ToDoActivity.java, and make following changes:

   • Add the import statement:

     import com.google.firebase.iid.FirebaseInstanceId;

   • Change the definition of MobileServiceClient from private to private static, so it now looks like this:

     private static MobileServiceClient mClient;

   • Add registerPush method:

     public static void registerPush() {
         final String token = FirebaseInstanceId.getInstance().getToken();
         if (token != null) {
             new AsyncTask<Void, Void, Void>() {
                 protected Void doInBackground(Void... params) {
                     mClient.getPush().register(token);
                     return null;
                 }
             }.execute();
         }
     }

   • Update the onCreate method of the ToDoActivity class. Make sure to add this code after the MobileServiceClient is instantiated.

     registerPush();

3. Add a new class to handle notifications. In Project Explorer, open the app > java > your-project-namespace nodes, and right-click the package name node. Click New, and then click Java Class. In Name, type ToDoMessagingService, and then click OK. Then, replace the class declaration with:

   import android.app.Notification;
   import android.app.NotificationManager;
   import android.app.PendingIntent;
   import android.content.Context;
   import android.content.Intent;
   
   import com.google.firebase.messaging.FirebaseMessagingService;
   import com.google.firebase.messaging.RemoteMessage;
   
   public class ToDoMessagingService extends FirebaseMessagingService {
   
       private static final int NOTIFICATION_ID = 1;
   
       @Override
       public void onMessageReceived(RemoteMessage remoteMessage) {
           String message = remoteMessage.getData().get("message");
           if (message != null) {
               sendNotification("Notification Hub Demo", message);
           }
       }
   
       private void sendNotification(String title, String messageBody) {
           PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, ToDoActivity.class), 0);
           Notification.Builder notificationBuilder = new Notification.Builder(this)
                   .setSmallIcon(R.drawable.ic_launcher)
                   .setContentTitle(title)
                   .setContentText(messageBody)
                   .setContentIntent(contentIntent);
           NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
           if (notificationManager != null) {
               notificationManager.notify(NOTIFICATION_ID, notificationBuilder.build());
           }
       }
   }

4. Add another class to handle token updates. Create ToDoInstanceIdService java class and replace the class declaration with:

   import com.google.firebase.iid.FirebaseInstanceIdService;
   
   public class ToDoInstanceIdService extends FirebaseInstanceIdService {
   
       @Override
       public void onTokenRefresh() {
           ToDoActivity.registerPush();
       }
   }

Your app is now updated to support push notifications.