Using a CountDownTimer as in one of the other answers is one way to do it. Another would be to use a Handler and the postDelayed method:
private boolean started = false;
private Handler handler = new Handler();
private Runnable runnable = new Runnable() {
@Override
public void run() {
final Random random = new Random();
int i = random.nextInt(2 - 0 + 1) + 0;
random_note.setImageResource(image[i]);
if(started) {
start();
}
}
};
public void stop() {
started = false;
handler.removeCallbacks(runnable);
}
public void start() {
started = true;
handler.postDelayed(runnable, 2000);
}
Here’s an example using a Timer and a TimerTask:
private Timer timer;
private TimerTask timerTask = new TimerTask() {
@Override
public void run() {
final Random random = new Random();
int i = random.nextInt(2 - 0 + 1) + 0;
random_note.setImageResource(image[i]);
}
};
public void start() {
if(timer != null) {
return;
}
timer = new Timer();
timer.scheduleAtFixedRate(timerTask, 0, 2000);
}
public void stop() {
timer.cancel();
timer = null;
}