问题:

I have an android application which has a timer to run a task:

time2.scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            sendSamples();
        }
    }, sampling_interval, sending_interval);

Lets say sampling_interval is 2000 and sending_interval is 4000.

So in this application I send some reading values from a sensor to the server. But I want to stop the sending after 10000 (10 seconds).

What should I do?

回答1:

try

        time2.scheduleAtFixedRate(new TimerTask() {
            long t0 = System.currentTimeMillis();
            @Override
            public void run() {
              if (System.currentTimeMillis() - t0 > 10 * 1000) {
                  cancel();
              } else {
                  sendSamples();
              }
            }
...

回答2:

Check this code:

private final static int DELAY = 10000;
private final Handler handler = new Handler();
private final Timer timer = new Timer();
private final TimerTask task = new TimerTask() {
    private int counter = 0;
    public void run() {
        handler.post(new Runnable() {
            public void run() {
                Toast.makeText(MainActivity.this, "test", Toast.LENGTH_SHORT).show();
            }
        });
        if(++counter == 4) {
            timer.cancel();
        }
    }
};

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    timer.schedule(task, DELAY, DELAY);
}