FirebaseMessagingService extended class

FcmMessageService.java

public class FcmMessageService extends FirebaseMessagingService{
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        //onMessageReceived will be called when ever you receive new message from server.. (app in background and foreground )
        Log.d("FCM", "From: " + remoteMessage.getFrom());
        
        if(remoteMessage.getNotification()!=null){
        Log.d("FCM", "Notification Message Body: " + remoteMessage.getNotification().getBody());
        }
        
        if(remoteMessage.getData().containsKey("post_id") && remoteMessage.getData().containsKey("post_title")){
            Log.d("Post ID",remoteMessage.getData().get("post_id").toString());
            Log.d("Post Title",remoteMessage.getData().get("post_title").toString());
            // eg. Server Send Structure data:{"post_id":"12345","post_title":"A Blog Post"}
        }
    }
}