How to execute the code with a certain frequency?

Question

Android

There is a need to execute the code, say, with an interval of 1 second, while the application / activity can be minimized and the screen can be turned off on the device in general. What is the more appropriate and architecturally correct solution to use for this?

Answer 1

AndroidManifest.xml

...
<receiver android:name=".MyAlarmReceiver" />
<service android:name=".MyService" android:process=":my_app_alternate" android:enabled="true" />
...

MyAlarmReceiver.java

public class MyAlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        context.startService(new Intent(context, MyService.class));		
        setupAlarm(context);
    }

    final long intervalMs = 60000; // Интервал в миллисекундах

    public static final void setupAlarm(Context context) {
        AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        Intent i = new Intent(context, MyAlarmReceiver.class);
        PendingIntent pi = PendingIntent.getBroadcast(context, 0, i, 0);
        if (am != null) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                am.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + intervalMs, pi);
            } else {
                am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + intervalMs, pi);
            }
        }
    }
}

MyService.java

public class MyService extends Service {

    Thread workThread = null;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (workThread == null) {
            workThread = new Thread(run);
            workThread.start();
        }
        return Service.START_STICKY;
    }

    final Runnable run = new Runnable() {
        @Override
        public void run() {
            try {
                while (true) {
                    //todo Что там надо делать раз в секунду
                    Thread.sleep(1000);
                }
            } catch (InterruptedException iex) { }
      
            workThread = null;
        }
    }
}

When we need to start code execution, we call MyAlarmReceiver.setupAlarm. Subsequent calls come from MyAlarmReceiver.onReceive.

Answer 2

WorkManager has restrictions from below. Well, no one canceled doze mode. So in this version, as described, it will not work.

Answer 3

I would do it through a separate thread and thread.sleep, and in order for it all to work in the background, I would push it into the service, this is the easiest option, and in order for everything to be correct, you need to start from the task.