Sunday 14 April 2019

HB Blog 166: Push Notification Using Firebase Cloud Messaging API.

Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that lets you reliably deliver messages at no cost.

Using FCM, you can notify a client app that new email or other data is available to sync. You can send notification messages to drive user re-engagement and retention. For use cases such as instant messaging, a message can transfer a payload of up to 4KB to a client app.

It offers a broad range of messaging options and capabilities.

With FCM, you can send two types of messages to clients:
  • Notification messages, sometimes thought of as "display messages." These are handled by the FCM SDK automatically.
  • Data messages, which are handled by the client app.
To write your Firebase Cloud Messaging Android client app, use the FirebaseMessaging API.


Refer the below link for complete sample code:-

Download Sample Code

Have a look on few code snippets,

//build.gradle
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apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.harshalbenake.fcm"
        minSdkVersion 16
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.google.firebase:firebase-messaging:15.0.0'
    implementation 'com.firebase:firebase-jobdispatcher:0.8.5'
    implementation 'com.google.firebase:firebase-core:15.0.0'
    implementation 'com.android.support:multidex:1.0.1'


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

//AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.harshalbenake.fcm">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

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

        <service android:name=".FCM.FCMInstanceIDService">
            <intent-filter>
                <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
            </intent-filter>
        </service>
    </application>

</manifest>

//FCMInstanceIDService.java
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package com.harshalbenake.fcm.FCM;

import android.util.Log;

import com.google.firebase.iid.FirebaseInstanceId;
import com.google.firebase.iid.FirebaseInstanceIdService;


public class FCMInstanceIDService extends FirebaseInstanceIdService {

    private static final String TAG = "MyFirebaseIIDService";

    /**
     * Called if InstanceID token is updated. This may occur if the security of
     * the previous token had been compromised. Note that this is called when the InstanceID token
     * is initially generated so this is where you would retrieve the token.
     */
    @Override
    public void onTokenRefresh() {
        // Get updated InstanceID token.
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();
        Log.d(TAG, "Refreshed token: " + refreshedToken);

        // If you want to send messages to this application instance or
        // manage this apps subscriptions on the server side, send the
        // Instance ID token to your app server.
        sendRegistrationToServer(refreshedToken);
    }

    /**
     * Persist token to third-party servers.
     *
     * Modify this method to associate the user's FCM InstanceID token with any server-side account
     * maintained by your application.
     *
     * @param token The new token.
     */
    private void sendRegistrationToServer(String token) {
    }
}

//FCMMessagingService.java 
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package com.harshalbenake.fcm.FCM;

import android.app.Notification;
import android.app.NotificationManager;
import android.content.Context;
import android.support.v4.app.NotificationCompat;
import android.util.Log;

import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

public class FCMMessagingService extends FirebaseMessagingService {

    private static final String TAG = "MyFirebaseMsgService";

    /**
     * Called when message is received.
     *
     * @param remoteMessage Object representing the message received from Firebase Cloud Messaging.
     */
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        Log.d(TAG, "From: " + remoteMessage.getFrom());

        // Check if message contains a notification payload.
        if (remoteMessage.getNotification() != null) {
            Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
        }

        // Also if you intend on generating your own notifications as a result of a received FCM
        // message, here is where that should be initiated. See sendNotification method below.
        System.out.println("sendNotification");
        displayNotification("Message Notification Body");
    }

    /**
     * display Notification
     *
     */
    private void displayNotification(String strMessage) {
        try {
            NotificationCompat.Builder mBuilder =
                    new NotificationCompat.Builder(FCMMessagingService.this, "1000")
                            .setSmallIcon(android.R.drawable.btn_plus)
                            .setContentTitle(strMessage)
                            .setContentText(strMessage)
                            .setAutoCancel(true)
                            .setDefaults(Notification.DEFAULT_SOUND)
                            .setPriority(Notification.PRIORITY_HIGH);
                mBuilder.setStyle(new NotificationCompat.BigTextStyle()
                        .bigText(strMessage));

                NotificationManager mNotificationManager =
                        (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
                // allows you to update the displayNotification later on.
                mNotificationManager.notify(1, mBuilder.build());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
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