Run task synchronized with clock

Question

I would like to perform a task synchronized with the android clock.

For example: in the second 0, then in the second 10, 20, 30, 40 and 50.
I don’t want to run every 10 seconds, I want to run in these exact seconds.

There’s a way to do it?

Answer 1

To accomplish this you can use the class AlarmManager and the method setRepeating, but in the documentation of this method it is said that the use of Handlers.

In class Handler you schedule Runnables to be executed in the future and also in a given time. The method Handler#postAtTime gets a Runnable and a time based on the running time of Android, for example, to schedule every 10 seconds, do:

final AtomicLong tick = new AtomicLong(SystemClock.uptimeMillis()
        + 10000L); // timestamp de 10 segundos no futuro

mHandler = new Handler(); // sem acesso a UI Thread
// mHandler = new Handler(Looper.getMainLooper()); // handler ligado a UI Thread
                                                   // ou seja, pode modificar a UI
mHandler.postAtTime(new Runnable() {

    @Override
    public void run() {
        // reagendar-se daqui a 10 segundos
        mHandler.postAtTime(this, tick.addAndGet(10000L));

        // TODO: realizar tarefa
    }
}, tick.get());

All that remains is for you to devise a mechanism to catch the exact time and then go on increasing the tick.

I hope I’ve helped.

Some useful links:

• Handler
• Alarmmanager
• Alarmmanager#setRepeating
• Systemclock
• Communicating with the UI Thread