Push notification not receiving when app not running on background

Question

I have added Firebase Cloud Messaging to my app and I setuped Firebase messaging services. And it was working fine and app was receiving notification even when the app was not running on background. But from last 2 days App is not receiving any notification. I don't know what happened with my code.

FcmMessagingService.java

import android.annotation.SuppressLint;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.media.AudioAttributes;
import android.net.Uri;
import android.os.Build;

import androidx.core.app.NotificationCompat;

import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.ImageRequest;
import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

public class FcmMessagingService extends FirebaseMessagingService {

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {

        if (remoteMessage.getData().size()>0){

            String title,message,img_url;

            title = remoteMessage.getData().get("title");
            message = remoteMessage.getData().get("message");
            img_url = remoteMessage.getData().get("img_url");

            Intent intent = new Intent(this, Notification.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            PendingIntent pendingIntent = PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_ONE_SHOT);

            Bitmap rawBitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.app_icon_round);

            Uri sounduri = Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.notification);

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                String id = "MY_CH_ID";
                CharSequence name = "Product";
                String description = "Notifications regarding our products";
                int importance = NotificationManager.IMPORTANCE_MAX;
                @SuppressLint("WrongConstant")
                NotificationChannel mChannel = new NotificationChannel(id, name, importance);
                AudioAttributes attributes = new AudioAttributes.Builder()
                        .setUsage(AudioAttributes.USAGE_NOTIFICATION)
                        .build();
                mChannel.setDescription(description);
                mChannel.enableLights(true);
                mChannel.setLightColor(Color.RED);
                mChannel.setSound(sounduri,attributes);
                notificationManager.createNotificationChannel(mChannel);
            }

            final NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "MY_CH_ID");
            builder.setContentTitle(title);
            builder.setSubText(message);
            builder.setContentIntent(pendingIntent);
            builder.setSound(sounduri);
            builder.setSmallIcon(R.drawable.fcmicon);
            builder.setLargeIcon(rawBitmap);
            builder.setChannelId("MY_CH_ID");


            ImageRequest imageRequest = new ImageRequest(img_url, new Response.Listener<Bitmap>() {
                @Override
                public void onResponse(Bitmap response) {

                    builder.setStyle(new NotificationCompat.BigPictureStyle().bigPicture(response));
                    NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                    notificationManager.notify(0,builder.build());

                }
            }, 0, 0, null, Bitmap.Config.RGB_565, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {

                }
            });

            MySingleton.getmInstance(this).addToRequestQue(imageRequest);

        }

    }

}

In my main activity I have subscribed to a topic.

FirebaseMessaging.getInstance().subscribeToTopic("PARETHUMUKAL_CHURCH");

AndroidManifest.xml

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

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.CALL_PHONE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/app_icon_round"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:usesCleartextTraffic="true">
        <activity android:name=".Archived"
            android:configChanges="orientation"
            android:screenOrientation="portrait" ></activity>
        <activity android:name=".Ebook"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity android:name=".Prayer"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity android:name=".Churchtiming"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Forgotpassword"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Privacypolicy"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Directoryquick"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Churchinside"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Extras"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Shrine"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity android:name=".Youtubeplayer" />
        <activity
            android:name=".Video"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Driveactivity"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Audios"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Images"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Profileregistration"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Registration"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Milandetails"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Ambulance"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Milan"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Feast"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Priest"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Churchadmin"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Youthassociation"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Vanithasamajam"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Familyunit"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Sundayschool"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Leaders"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".History"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity android:name=".Livestream" />
        <activity
            android:name=".Notification"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Myprofile"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Quicklinks"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Services"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Directory"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Gallery"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Groups"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Administration"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Church"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Aboutus"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".WelcomeActivity"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Homewindow"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Login"
            android:configChanges="orientation"
            android:screenOrientation="portrait" />
        <activity
            android:name=".Splashscreen"
            android:configChanges="orientation"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

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

        <meta-data
            android:name="preloaded_fonts"
            android:resource="@array/preloaded_fonts" />
    </application>

</manifest>

build.gradle implementation

implementation 'com.google.firebase:firebase-messaging:19.0.1'

I dont know what is the problem.

Answer 1

Everything is fine on your end. You just need to send Firebase Notification Messages see here.

As you can see there is Notification JSON object and it includes title and body keys which will be displayed in the notification title.

Sample:

{
  "message":{
    "token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
    "notification":{
      "title":"Portugal vs. Denmark",
      "body":"great match!"
    }
  }
}

Don't forget to Replace token with your FCM device token.