Run a method for 5 sec

I would like to run a method every 1 ms in a timespan of 5 sec. Right now i am using

long t = System.currentTimeMillis();
long end = t + 5000;
while (System.currentTimeMillis() < end) {
    // do something
    // pause to avoid churning
    try {
        Thread.sleep(1000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}

The problem with this code is that it freezes the UI in the 5 sec timespan. Which I’m not interested in. Can a runnable or handler be used instead, and then terminated after 5 sec ? Regards!

Answer

You can use Handler#postDelayed recursively:

private void doTask(long endTimeMillis) {

    // do something

    long now = System.currentTimeMillis();
    if (now < endTimeMillis) {
        new Handler(Looper.getMainLooper()).postDelayed(() -> {
            doTask(endTimeMillis);
        }, 1L);
    }
}