如何在不使用 bindService 的情况下等待服务在 Android 上启动

Question

I know that I can wait for a service start by doing

bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);

where serviceConnection implements a callback that is called when the service starts. However, I need a service that is less killeable, that is, a service hat uses startForeground . But this can only work if I start my service with startService , which does not provide a way to pass a serviceConnection .

How can I wait for an android service to start?

Why I need it to start? Well, because I need to call things inside it by doing service.method1(); etc.

Answer 1

You can try to use both methods, first start the service with startForeground() and then use bindService() to wait for the service connection.

The service starts in the foreground and you can use the service methods.

Starting Service:

listenServiceIntent = new Intent(getApplicationContext(), ListenService.class);

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

    //Start in Foreground
    ContextCompat.startForegroundService(this, listenServiceIntent);

    if (connection != null) {
        //Then bind service
        bindService(listenServiceIntent, connection, Context.BIND_AUTO_CREATE);
    }
}
else {
    startService(listenServiceIntent);
    if (connection != null) {
        bindService(listenServiceIntent, connection, Context.BIND_AUTO_CREATE);
    }
}

Waiting Connection:

private ServiceConnection connection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.i(TAG, "onServiceConnected");

            ListenService.LocalBinder binder = (ListenService.LocalBinder) service;
            listenService = binder.getService();

            //HERE you can use service methods

        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.i(TAG, "onServiceDisconnected");
        }
};

Create notificationChannel:

public static void createNotificationChannel(Context context) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel serviceChannel = new NotificationChannel(
                    NOTIFICATION_CHANNEL,
                    NOTIFICATION_NAME,
                    NotificationManager.IMPORTANCE_HIGH
            );

            NotificationManager manager =    context.getSystemService(NotificationManager.class);
            if (manager != null) {
                manager.createNotificationChannel(serviceChannel);
            }
        }
    }

Push notification:

public static Notification pushNotification(Context context, String notificationText, Class classNotification) {

        Intent notificationIntent = new Intent(context, classNotification);

        PendingIntent pendingIntent = PendingIntent.getActivity(context,
                0, notificationIntent, 0);


        return new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL)
                .setContentTitle(context.getString(R.string.notification_title))
                .setContentText(notificationText)
                .setContentIntent(pendingIntent)
                .setSmallIcon(R.drawable.logosinfondo_mini)
                .setColor(Color.MAGENTA)
                .setAutoCancel(true)
                .build();
    }

In onCreate() inside your Service:

@Override
    public void onCreate() {
        super.onCreate();
        Lib.createNotificationChannel(this);
        startForeground(1, Lib.pushNotification(this, "Started", ListenActivity.class));
    }