android notification in background if app closed?

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I am trying to display a notification in the Android notifications bar even if my application is closed.

I've tried searching, but I have had no luck finding help.

An example of this is a news application. Even if the phone screen is off or the news application is closed, it can still send a notification for recent news and have it appear in the notification bar.

How might I go about doing this in my own application?

You have to build a Service that handles your news and shows notifications when it knows that are new news (Service Doc). The service will run in background even if your application is closed. You need a BroadcastReciever to run the service in background after the boot phase is completed. (Start service after boot).

The service will build your notifications and send them through the NotificationManager.

EDIT: This article may suit your needs

Custom Notifications when app is in background or killed · Issue #4 , When the app is closed, your notifications are processed by the the app is in foreground, if you app if is background, the Google Services will  Handling Notifications in Foreground When the app is closed, your notifications are processed by the Google Service process, which take care of displaying your notifications as required, including the default click action (opening the app) and the notification icon.

The selected answer is still correct, but only for devices running Android 7 versions and below. As of Android 8+, you can no longer have a service running in the background while your app is idle/closed. So, it now depends on how you set up your notifications from your GCM/FCM server. Ensure to set it to the highest priority. If your app is in the background or just not active and you only send notification data, the system process your notification and send it to the Notification tray.

Firebase Notifications in Background & Foreground in Android, If you want foregrounded apps to receive notification messages or data messages, After that time, various OS behaviors such as Android O's background might want users of your app to receive alarm notifications even on a locked device. This is the most up to date answer, as the Firebase documentation now reads: When your app is in the background, Android directs notification messages to the system tray. A user tap on the notification opens the app launcher by default. This includes messages that contain both notification and data payload.

I used this answer to write a service, and as an exmaple you need to call ShowNotificationIntentService.startActionShow(getApplicationContext()) inside one of your activities:

import android.app.IntentService;
import android.content.Intent;
import android.content.Context;
public class ShowNotificationIntentService extends IntentService {
    private static final String ACTION_SHOW_NOTIFICATION = "my.app.service.action.show";
    private static final String ACTION_HIDE_NOTIFICATION = "my.app.service.action.hide";


    public ShowNotificationIntentService() {
        super("ShowNotificationIntentService");
    }

    public static void startActionShow(Context context) {
        Intent intent = new Intent(context, ShowNotificationIntentService.class);
        intent.setAction(ACTION_SHOW_NOTIFICATION);
        context.startService(intent);
    }

    public static void startActionHide(Context context) {
        Intent intent = new Intent(context, ShowNotificationIntentService.class);
        intent.setAction(ACTION_HIDE_NOTIFICATION);
        context.startService(intent);
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        if (intent != null) {
            final String action = intent.getAction();
            if (ACTION_SHOW_NOTIFICATION.equals(action)) {
                handleActionShow();
            } else if (ACTION_HIDE_NOTIFICATION.equals(action)) {
                handleActionHide();
            }
        }
    }

    private void handleActionShow() {
        showStatusBarIcon(ShowNotificationIntentService.this);
    }

    private void handleActionHide() {
        hideStatusBarIcon(ShowNotificationIntentService.this);
    }

    public static void showStatusBarIcon(Context ctx) {
        Context context = ctx;
        NotificationCompat.Builder builder = new NotificationCompat.Builder(ctx)
                .setContentTitle(ctx.getString(R.string.notification_message))
                .setSmallIcon(R.drawable.ic_notification_icon)
                .setOngoing(true);
        Intent intent = new Intent(context, MainActivity.class);
        PendingIntent pIntent = PendingIntent.getActivity(context, STATUS_ICON_REQUEST_CODE, intent, 0);
        builder.setContentIntent(pIntent);
        NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notif = builder.build();
        notif.flags |= Notification.FLAG_ONGOING_EVENT;
        mNotificationManager.notify(STATUS_ICON_REQUEST_CODE, notif);
    }
}

Receive messages in an Android app, From this screen, the user can control their notification preferences. Exceptions to the restriction. Apps running on Android 10 or higher can start activities only  @AndroidDev yes "standard" Android will allow it to be run if you swipe it in the recents menu away, because it will not force kill the app. but samsung does a force kill for example. for the reboot. which Android version do you have running there, also which version of workmanager. that might affect thigns too – mikepenz Jul 17 '19 at 21:59

Restrictions on starting activities from the background, Background notifications can wake an iOS and Android app that has been "​swiped away" content_available to wake the app if it is running in the background. The "onActivityDestroyed" will get called when the app is closed, so if you can check if the app is in background when it is called (so the app is already closed) you can grep exactly the moment when the app is being closed. Code of "isAppOnForeground" (I'm using it in a Utils static class):

Data & Background Notifications, how to handle notification when app in background in firebase android push notifications when app is closed android fcm notification not received when app is  Third scenario If the service does not have a foreground notification, it can still keep running if the app is closed. We can do this by making the service run in a different process. (However, I've heard some people say that it may not work. left to you to try it out yourself)

android notification in background if app closed?, Jan 05, 2017 · When I send a push notification and the APP is in background or closed, show the message in android notify. If you are a paid customer, please  The app could still be running and as a result the am.getRunningTasks() could return your app as the running app. in which case this method will return false. From their documentation: Note that "running" does not mean any of the task's code is currently loaded or activity -- the task may have been frozen by the system, so that it can be

Comments
  • Did you find your answer?! same problem here
  • What about when you dont want to use GCM/FCM services, what are the alternatives?
  • The question states he wants to handle notifications even when the app is closed (i.e. - never even started). So, your solution does not solve the problem asked about.