Push Notifications

Overview

Enable your users to receive mobile push messages sent from the Apple (APNs) and Google (FCM/GCM) platforms. The CLI deploys your push notification backend using Amazon Pinpoint. You can also create Amazon Pinpoint campaigns that tie user behavior to push or other forms of messaging.

Set Up Your Backend

Complete the Get Started steps before you proceed.
Use the CLI to add storage to your cloud-enabled backend and app.

In a terminal window, navigate to your project folder (the folder that typically contains your project level build.gradle), and add the SDK to your app.
```
 $ cd ./YOUR_PROJECT_FOLDER
 $ amplify add notifications
```
Set up your backend to support receiving push notifications:
- Choose Firebase Cloud Messaging (FCM).
```
 > FCM
```
- Provide your ApiKey. The FCM console refers to this value as ServerKey. For information on getting an FCM ApiKey, see the section Setting Up FCM/GCM Guide. Use the steps in the next section to connect your app to your backend.

Connect to Your Backend

Use the following steps to connect your app to the push notification backend services.

Add the following dependencies and plugin to your app/build.gradle:

 dependencies {
     // Overrides an auth dependency to ensure correct behavior
     implementation 'com.google.android.gms:play-services-auth:15.0.1'

     implementation 'com.google.firebase:firebase-core:16.0.1'
     implementation 'com.google.firebase:firebase-messaging:17.3.0'

     implementation 'com.amazonaws:aws-android-sdk-pinpoint:2.13.+'
     implementation ('com.amazonaws:aws-android-sdk-mobile-client:2.13.+@aar') { transitive = true }
 }

 apply plugin: 'com.google.gms.google-services'

Add the following to your project level build.gradle. Make sure that you specify the google repository:

 buildscript {
     dependencies {
         classpath 'com.google.gms:google-services:4.0.1'
     }
 }

 allprojects {
     repositories {
         google()
     }
 }

AndroidManifest.xml must contain the definition of the following service for PushListenerService in the application tag:

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

Create an Amazon Pinpoint client in the location of your push notification code.

 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.v4.content.LocalBroadcastManager;
 import android.support.v7.app.AlertDialog;
 import android.support.v7.app.AppCompatActivity;
 import android.util.Log;

 import com.amazonaws.mobile.client.AWSMobileClient;
 import com.amazonaws.mobile.client.AWSStartupHandler;
 import com.amazonaws.mobile.client.AWSStartupResult;
 import com.amazonaws.mobileconnectors.pinpoint.PinpointConfiguration;
 import com.amazonaws.mobileconnectors.pinpoint.PinpointManager;
 import com.google.android.gms.tasks.OnCompleteListener;
 import com.google.android.gms.tasks.Task;
 import com.google.firebase.iid.FirebaseInstanceId;
 import com.google.firebase.iid.InstanceIdResult;

 public class MainActivity extends AppCompatActivity {
     public static final String TAG = MainActivity.class.getSimpleName();

     private static PinpointManager pinpointManager;

     public static PinpointManager getPinpointManager(final Context applicationContext) {
         if (pinpointManager == null) {
             final AWSConfiguration awsConfig = new AWSConfiguration(applicationContext);
             AWSMobileClient.getInstance().initialize(applicationContext, awsConfig, new Callback<UserStateDetails>() {
                 @Override
                 public void onResult(UserStateDetails userStateDetails) {
                     Log.i("INIT", userStateDetails.getUserState());
                 }

                 @Override
                 public void onError(Exception e) {
                     Log.e("INIT", "Initialization error.", e);
                 }
             });

             PinpointConfiguration pinpointConfig = new PinpointConfiguration(
                     applicationContext,
                     AWSMobileClient.getInstance(),
                     awsConfig);

             pinpointManager = new PinpointManager(pinpointConfig);

             FirebaseInstanceId.getInstance().getInstanceId()
                     .addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
                         @Override
                         public void onComplete(@NonNull Task<InstanceIdResult> task) {
                             final String token = task.getResult().getToken();
                             Log.d(TAG, "Registering push notifications token: " + token);
                             pinpointManager.getNotificationClient().registerDeviceToken(token);
                         }
                     });
         }
         return pinpointManager;
     }

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         // Initialize PinpointManager
         getPinpointManager(getApplicationContext());
     }
 }

Add Amazon Pinpoint Targeted and Campaign Push Messaging

The Amazon Pinpoint console enables you to target your app users with push messaging. You can send individual messages or configure campaigns that target a group of users that match a profile that you define. For instance, you could email users that have not used the app in 30 days, or send an SMS to those that frequently use a given feature of your app.

The following steps show how to receive push notifications targeted for your app.

Add a push listener service to your app.

The name of the class must match the push listener service name used in the app manifest. pinpointManager is a reference to the static PinpointManager variable declared in the MainActivity shown in a previous step. Use the following steps to detect and display Push Notification in your app.

The following push listener code assumes that the app’s MainActivity is configured using the manifest setup described in a previous section.

 import android.content.Intent;
 import android.os.Bundle;
 import android.support.v4.content.LocalBroadcastManager;
 import android.util.Log;

 import com.amazonaws.mobileconnectors.pinpoint.targeting.notification.NotificationClient;
 import com.amazonaws.mobileconnectors.pinpoint.targeting.notification.NotificationDetails;
 import com.google.firebase.messaging.FirebaseMessagingService;
 import com.google.firebase.messaging.RemoteMessage;

 import java.util.HashMap;

 public class PushListenerService extends FirebaseMessagingService {
     public static final String TAG = PushListenerService.class.getSimpleName();

     // Intent action used in local broadcast
     public static final String ACTION_PUSH_NOTIFICATION = "push-notification";
     // Intent keys
     public static final String INTENT_SNS_NOTIFICATION_FROM = "from";
     public static final String INTENT_SNS_NOTIFICATION_DATA = "data";

     @Override
     public void onNewToken(String token) {
         super.onNewToken(token);

         Log.d(TAG, "Registering push notifications token: " + token);
         MainActivity.getPinpointManager(getApplicationContext()).getNotificationClient().registerDeviceToken(token);
     }

     @Override
     public void onMessageReceived(RemoteMessage remoteMessage) {
         super.onMessageReceived(remoteMessage);
         Log.d(TAG, "Message: " + remoteMessage.getData());

         final NotificationClient notificationClient = MainActivity.getPinpointManager(getApplicationContext()).getNotificationClient();

         final NotificationDetails notificationDetails = NotificationDetails.builder()
                 .from(remoteMessage.getFrom())
                 .mapData(remoteMessage.getData())
                 .intentAction(NotificationClient.FCM_INTENT_ACTION)
                 .build();

         NotificationClient.CampaignPushResult pushResult = notificationClient.handleCampaignPush(notificationDetails);

         if (!NotificationClient.CampaignPushResult.NOT_HANDLED.equals(pushResult)) {
             /**
                The push message was due to a Pinpoint campaign.
                If the app was in the background, a local notification was added
                in the notification center. If the app was in the foreground, an
                event was recorded indicating the app was in the foreground,
                for the demo, we will broadcast the notification to let the main
                activity display it in a dialog.
             */
             if (NotificationClient.CampaignPushResult.APP_IN_FOREGROUND.equals(pushResult)) {
                 /* Create a message that will display the raw data of the campaign push in a dialog. */
                 final HashMap<String, String> dataMap = new HashMap<>(remoteMessage.getData());
                 broadcast(remoteMessage.getFrom(), dataMap);
             }
             return;
         }
     }

     private void broadcast(final String from, final HashMap<String, String> dataMap) {
         Intent intent = new Intent(ACTION_PUSH_NOTIFICATION);
         intent.putExtra(INTENT_SNS_NOTIFICATION_FROM, from);
         intent.putExtra(INTENT_SNS_NOTIFICATION_DATA, dataMap);
         LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
     }

     /**
      * Helper method to extract push message from bundle.
      *
      * @param data bundle
      * @return message string from push notification
      */
     public static String getMessage(Bundle data) {
         return ((HashMap) data.get("data")).toString();
     }
 }

To create a new campaign to send notifications to your app from the Amazon Pinpoint console run the following command from your app project folder.
```
 $ amplify notifications console
```
Provide a campaign name, choose Next, choose Filter by standard attributes, and then choose android as the platform.
You should see 1 device as a targeted endpoint, which is the app we are running on the Android device. Choose the option and then choose Next Step.
Provide text for a sample title and body for push notification, and then choose Next Step.
Choose Immediate, and then choose Next Step.
Review the details on the screen, and then choose Launch Campaign.
A notification should appear on the Android device. You may want to try testing your app receiving notifications when it is in the foreground and when closed.

Push Notifications

Overview

Set Up Your Backend

Connect to Your Backend

Add Amazon Pinpoint Targeted and Campaign Push Messaging

Next Steps