Failed to post notification on channel “null” Targ

Question

Two log showing

1: Use of stream types is deprecated for operations other than volume control

2: See the documentation of setSound() for what to use instead with android.media.AudioAttributes to qualify your playback use case

Answer 1

When you target Android 8.0 (API level 26), you must implement one or more notification channels to display notifications to your users.

int NOTIFICATION_ID = 234;

    NotificationManager notificationManager = (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);


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


        String CHANNEL_ID = "my_channel_01";
        CharSequence name = "my_channel";
        String Description = "This is my channel";
        int importance = NotificationManager.IMPORTANCE_HIGH;
        NotificationChannel mChannel = new NotificationChannel(CHANNEL_ID, name, importance);
        mChannel.setDescription(Description);
        mChannel.enableLights(true);
        mChannel.setLightColor(Color.RED);
        mChannel.enableVibration(true);
        mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
        mChannel.setShowBadge(false);
        notificationManager.createNotificationChannel(mChannel);
    }

    NotificationCompat.Builder builder = new NotificationCompat.Builder(ctx, CHANNEL_ID)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle(title)
            .setContentText(message);

    Intent resultIntent = new Intent(ctx, MainActivity.class);
    TaskStackBuilder stackBuilder = TaskStackBuilder.create(ctx);
    stackBuilder.addParentStack(MainActivity.class);
    stackBuilder.addNextIntent(resultIntent);
    PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);

    builder.setContentIntent(resultPendingIntent);

    notificationManager.notify(NOTIFICATION_ID, builder.build());

Answer 2

String CHANNEL_ID = "my_channel";

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this,CHANNEL_ID);

Answer 3

I had a similar problem but starting an service as a background activity, in the service this code worked:

public static final int PRIMARY_FOREGROUND_NOTIF_SERVICE_ID = 1001;

@Override
public void onCreate() {
    super.onCreate();

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

        String id = "_channel_01";
        int importance = NotificationManager.IMPORTANCE_LOW;
        NotificationChannel mChannel = new NotificationChannel(id, "notification", importance);
        mChannel.enableLights(true);

        Notification notification = new Notification.Builder(getApplicationContext(), id)
                .setSmallIcon(R.drawable.ic_launcher)
                .setContentTitle("My chat")
                .setContentText("Listening for incoming messages")
                .build();

        NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        if (mNotificationManager != null) {
            mNotificationManager.createNotificationChannel(mChannel);
            mNotificationManager.notify(PRIMARY_FOREGROUND_NOTIF_SERVICE_ID, notification);
        }

        startForeground(PRIMARY_FOREGROUND_NOTIF_SERVICE_ID, notification);
    }
}

It's not the best solution but just to start the service in the background It does work

Answer 4

You can solve this in two ways but for both of them you need to create a notification channel with an specific channel id.

NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
String id = "my_channel_01";
int importance = NotificationManager.IMPORTANCE_LOW;
NotificationChannel mChannel = new NotificationChannel(id, name,importance);
mChannel.enableLights(true);
mNotificationManager.createNotificationChannel(mChannel);

First way is to set channel for notification in constructor:

Notification notification = new Notification.Builder(MainActivity.this , id).setContentTitle("Title");
mNotificationManager.notify("your_notification_id", notification);

Second way is to set the channel by Notificiation.Builder.setChannelId()

Notification notification = new Notification.Builder(MainActivity.this).setContentTitle("Title").
setChannelId(id);
mNotificationManager.notify("your_notification_id", notification);

Hope this helps

Answer 5

First create the notification channel:

public static final String NOTIFICATION_CHANNEL_ID = "4655";
//Notification Channel
        CharSequence channelName = NOTIFICATION_CHANNEL_NAME;
        int importance = NotificationManager.IMPORTANCE_LOW;
        NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME, importance);
        notificationChannel.enableLights(true);
        notificationChannel.setLightColor(Color.RED);
        notificationChannel.enableVibration(true);
        notificationChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});


NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.createNotificationChannel(notificationChannel);

then use the channel id in the constructor:

final NotificationCompat.Builder builder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID)
                .setDefaults(Notification.DEFAULT_ALL)
                .setSmallIcon(R.drawable.ic_timers)
                .setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400})
                .setSound(null)
                .setContent(contentView)
                .setPriority(NotificationCompat.PRIORITY_DEFAULT)
                .setLargeIcon(picture)
                .setTicker(sTimer)
                .setContentIntent(timerListIntent)
                .setAutoCancel(false);

Answer 6

This issue is related to the old FCM version.

Update your dependency to com.google.firebase:firebase-messaging:15.0.2 or higher.

This will fix the error

failed to post notification on channel null

when your app receives notifications in the background because now Firebase provides a default notification channel with basic settings.

But you also can specify the default Notification Channel for FCM in the manifest.

<meta-data
android:name="com.google.firebase.messaging.default_notification_channel_id"
android:value="@string/default_notification_channel_id"/>

To learn more here