Handler.postDelayed(Runnable) vs CountdownTimer

问题

Sometimes we need to delay a code before it runs.

This is doable by the Handler.postDelayed(Runnable) or CountdownTimer.

Which one is better in terms of performance?

See the sample code below

Handler

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                 //DO SOMETHING
            }
        }, 1000);

CountDownTimer

        new CountDownTimer(1000, 1000) {
            public void onFinish() {
                 //DO SOMETHING
            }
            public void onTick(long millisUntilFinished) {}
        }.start();

回答1:

The Handler should offer you better performances as CountDownTimer contains itself a Handler as you can see here.

回答2:

Use Handler,Android Handler is Good.

See Here, What Others say About Handler

回答3:

I agree that Handler is offering a better performance. But on a side note, you should keep in mind that CountDownTimer object will be destroyed after completed. A Handler will continue to exist after finished. If you only need a temporary timer then CountDownTimer is preferable. Otherwise, use a Handler.

来源：https://stackoverflow.com/questions/35497844/handler-postdelayedrunnable-vs-countdowntimer