Firebase Cloud Messaging - onMessageReceived not working

Question

I want to make a simple notification feature in my app. I followed this YouTube video and both of these Firebase documentation URLs 1 and 2 plus the Firebase tool assistant in Android Studio (which says I'm connected to Firebase). For some reason, following these steps and documents on my older app (which code is posted below), it won't allow me to receive notifications. However, if I follow the same steps on a brand new app it works perfectly. I tested both apps on the same physical device and environment in the background, active and terminated states. Every time the new demo app I created works with no issue but my older app which I want notifications in does not work. Both tested without getting the device ID. I do not even get any error logs or any TAG log. I think one of my compiled projects is interfering, not sure exactly what but I might have to look there.

I also checked out all these SO posts already: 123 and more

PS. I removed my package name below, I checked multiple times on FireBase and they match so I know that is not the issue. However, my new demo app's FireBase shows that my app connected but my older app's FireBase did not. Also, I've set a bounty before and still running into the same issue.

Here's my problematic code:

Notification.java (its a service like the documentation asks)

public class Notification extends FirebaseMessagingService {
public Notification() {
}
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    showNotification(remoteMessage.getData().get("message"));

    Log.d("FMC", "Message Notification Body: " + remoteMessage.getNotification().getBody());
}

private void showNotification(String message) {
    Intent i=new Intent(this, SplashScreen.class);
    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

    PendingIntent pendingIntent=PendingIntent.getActivity(this,0,i,PendingIntent.FLAG_UPDATE_CURRENT);
    NotificationCompat.Builder builder=new NotificationCompat.Builder(this)
            .setAutoCancel(true)
            .setContentTitle("FCM TITLE").setContentText(message)
            .setSmallIcon(R.drawable.pt_icon)
            .setDefaults(android.app.Notification.DEFAULT_ALL)
            .setContentIntent(pendingIntent);

    NotificationManager notificationManager= (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    notificationManager.notify(0,builder.build());
}
}

Notice I do not even get a log in the notification.java above.

Project.gradle

buildscript {
repositories {
    jcenter()
    maven {
        url 'https://maven.google.com/'
        name 'Google'
    }
}
dependencies {
    classpath 'com.android.tools.build:gradle:3.0.1'
    classpath 'com.google.gms:google-services:3.2.0'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}

allprojects {
repositories {
    jcenter()

    maven { url "https://jitpack.io" }
    maven { url 'https://maven.google.com' }
    google()
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}

app.gradle

apply plugin: 'com.android.application'

android {
compileSdkVersion 26

defaultConfig {

    minSdkVersion 16
    targetSdkVersion 26
    versionCode 16
    versionName "2.6"
}
dexOptions {
    jumboMode = true
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
//Code below is added to fix random error ("Fix the issues identified by lint")
lintOptions {
    abortOnError false
}
productFlavors {
}
}

dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
//compile project(path: ':backend', configuration: 'android-endpoints')
//Removed the 0.2.+
compile 'com.daprlabs.aaron:cardstack:0.3.1-beta0'
//noinspection GradleCompatible
compile 'com.android.support:appcompat-v7:25.4.0'
compile "com.android.support:appcompat-v7:19.0.+"
compile 'com.android.support:design:23.4.0'
compile 'com.android.support:recyclerview-v7:23.4.0'
compile 'com.android.support:cardview-v7:23.4.0'

compile 'com.github.danylovolokh:video-player-manager:0.2.0'
compile 'com.github.danylovolokh:list-visibility-utils:0.2.0'



implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.google.firebase:firebase-messaging:11.8.0'
compile 'com.google.firebase:firebase-core:11.8.0'


compile 'com.orhanobut:dialogplus:1.11@aar'


compile 'com.nineoldandroids:library:2.4.0'
compile files('libs/sinch-android-rtc-3.9.14.jar')
compile 'com.amazonaws:aws-android-sdk-s3:2.4.4'
compile 'com.github.chrisbanes:PhotoView:1.2.6'
compile 'com.davemorrissey.labs:subsampling-scale-image-view:3.5.0'
compile 'com.github.amlcurran.showcaseview:library:5.4.3'
compile 'com.github.d-max:spots-dialog:0.7@aar'
compile 'com.victor:lib:1.0.4'
compile 'com.github.bumptech.glide:glide:3.5.2'
compile 'com.squareup.picasso:picasso:2.5.2'
compile 'com.android.support:recyclerview-v7:23.0.0'
compile 'me.grantland:autofittextview:0.2.0'
compile 'com.wang.avi:library:1.0.5'
compile 'com.nineoldandroids:library:2.4.0'
compile 'com.braintreepayments.api:drop-in:2.3.8'
compile 'com.braintreepayments.api:braintree:2.3.9'
compile 'com.loopj.android:android-async-http:1.4.9'
compile 'com.getbase:floatingactionbutton:1.10.1'
compile 'com.mxn.soul:flowingdrawer-core:1.2.2'
compile 'com.github.rengwuxian:MaterialEditText:2.1.4'
compile 'com.github.PhilJay:MPAndroidChart:v3.0.1'
compile 'net.gotev:uploadservice:3.2.5'
compile 'in.srain.cube:ultra-ptr:1.0.11'
compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha9'
testCompile 'junit:junit:4.12'
//implementation 'com.android.support:appcompat-v4:23.+'
}


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

AndroidManifest.xml

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

<uses-feature
    android:name="android.hardware.microphone"
    android:required="false" />

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<!--
so the app can be found on tablets Google Play

<uses-permission android:name="android.permission.CALL_PHONE" />
-->
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<!-- <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/> -->
<!-- <uses-permission android:name="android.permission.WAKE_LOCK" /> -->
<!-- <uses-permission android:name="android.permission.READ_PHONE_STATE" /> -->

<grant-uri-permission
    android:path="string"
    android:pathPattern="string"
    android:pathPrefix="string" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/_icon"
    android:label=""
    android:supportsRtl="true"
    android:theme="@style/Theme.AppCompat.Light.NoActionBar"
    tools:node="replace">
    <activity android:name=".SplashScreen">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

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

    <!-- &lt;!&ndash; -->
    <!-- Set custom default icon. This is used when no icon is set for incoming notification messages. -->
    <!-- See README() for more. -->
    <!-- &ndash;&gt; -->
    <!-- <meta-data -->
    <!-- android:name="com.google.firebase.messaging.default_notification_icon" -->
    <!-- android:resource="@drawable/pt_icon" /> -->
    <!-- &lt;!&ndash; -->
    <!-- Set color used with incoming notification messages. This is used when no color is set for the incoming -->
    <!-- notification message. See README() for more. -->
    <!-- &ndash;&gt; -->
    <!-- <meta-data -->
    <!-- android:name="com.google.firebase.messaging.default_notification_color" -->
    <!-- android:resource="@color/colorAccent" /> -->

    <activity android:name=".SignInForm" />
    <activity android:name=".SignUpPage" />
    <activity android:name=".SellerFillOutForm" />
    <activity android:name=".BuyerFillOutForm" />
    <activity
        android:name=".BuyerHomePage"
        android:label="@string/title_activity_buyer_home_page" />

    <action android:name="android.intent.action.VIEW" />

    <category android:name="android.intent.category.BROWSABLE" />

    <data android:scheme="http" />

    <activity android:name=".VideoPlayerActivity" />
    <activity android:name=".BackgroundTask" />

    <service
        android:name="com.amazonaws.mobileconnectors.s3.transferutility.TransferService"
        android:enabled="true" />

    <activity android:name=".EnterCreditCard" />
    <activity android:name=".PickMeeting" />
    <activity android:name=".HowBillingWorks" />
    <activity android:name=".ReBillingPlan" />
    <activity android:name=".PayBill" />
    <activity
        android:name=".Buyer_Home_Page"
        android:configChanges="locale|orientation" />
    <activity android:name=".Seller_Home_Page" />
    <activity android:name=".ProductList" />
    <activity android:name=".EditProduct" />
    <activity android:name=".EditSellerAccount" />
    <activity android:name=".EditBuyerAccount" />
    <activity android:name=".Video_Calling.incomingVideoCall" />
    <activity android:name=".Video_Calling.CallScreenActivity" />
    <activity android:name=".SellerAnalytics" />
    <activity android:name=".Swipe_Layout.SwipeLayout" />
    <activity android:name=".Swipe_Layout.PopUpActivity" />
</application>

</manifest>

Working code below (the app I made just to test my steps and works 100%):

Notifaction.java

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.support.v4.app.NotificationCompat;
import android.util.Log;

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

import static android.content.ContentValues.TAG;

public class Notifaction extends FirebaseMessagingService {
public Notifaction() {
}
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    showNotification(remoteMessage.getData().get("message"));
}

private void showNotification(String message) {
    Intent i=new Intent(this,MainActivity.class);
    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

    PendingIntent pendingIntent=PendingIntent.getActivity(this,0,i,PendingIntent.FLAG_UPDATE_CURRENT);
    NotificationCompat.Builder builder=new NotificationCompat.Builder(this)
            .setAutoCancel(true)
            .setContentTitle("FCM TITLE").setContentText(message)
            .setSmallIcon(R.drawable.ic_launcher_background)
            .setDefaults(Notification.DEFAULT_ALL)
            .setContentIntent(pendingIntent);

    NotificationManager notificationManager= (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    notificationManager.notify(0,builder.build());
}
}

AndroidManiest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="">
<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=".Notifaction">
        <intent-filter>
            <action 
android:name="com.google.firebase.MESSAGING_EVENT"/>
        </intent-filter>
    </service>

</application>

</manifest>

app.gradle

apply plugin: 'com.android.application'

android {
compileSdkVersion 26
defaultConfig {
    applicationId ""
    minSdkVersion 14
    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:11.8.0'
compile 'com.google.firebase:firebase-core:11.8.0'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}


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

Project.grdle

    // Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

repositories {
    google()
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:3.0.1'
    classpath 'com.google.gms:google-services:3.2.0'

    // NOTE: Do not place your application dependencies here; they 
belong
    // in the individual module build.gradle files
}
}

allprojects {
repositories {
    google()
    jcenter()
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}

Also, I added the .json file to both projects. Here is a screenshot: .

Answer 1

Even I faced the same issue, It got resolved by adding full path android:name service in AndroidManifest.xml

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

give try once & let me know if you have any issue.

Answer 2

Most likely your notifications are not showing due to Android Oreo new notifications model which requires to specify channels definitions in order to build and show notifications. Also in your app.gradle, you are targeting android version 26 which is Android Oreo, so you will have to implement the code below either way.

It is easy to adopt. all you need to do is:

1. define a notification channel in your YourApplicationClass.onCreate()

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            NotificationChannel chan1 = new NotificationChannel(
                YOUR_DESIRED_CHANNEL_ID_STRING,
                YOUR_DESIRED_CHANNEL_LABEL_STRING, 
                NotificationManager.IMPORTANCE_DEFAULT);

            chan1.setDescription(YOUR_DESIRED_CHANNEL_DESC_STRING);//OPTIONAL
            chan1.setLightColor(Color.BLUE);//OPTIONAL     
            chan1.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);//OPTIONAL
            chan1.setShowBadge(true);//OPTIONAL

            getManager().createNotificationChannel(chan1);
        }

2. replace you notification builder with this constructor

    NotificationCompat.Builder builder=
new NotificationCompat.Builder(this, YOUR_DESIRED_CHANNEL_ID_STRING);

Good to know that you can define more than one channel with different properties targeting Android Oreo and higher