Implementation of the Countdown function of Android (CountDownTimer)

Implementation of the Countdown function of Android (CountDownTimer)
I used to write countdown during programming. However, Android has encapsulated a countdown CountDownTimer, in fact, the creation of background threads and Handler queue are encapsulated into a convenient class call.

Note:
In CountDownTimer timer = new CountDownTimer (30000,100 0), the first parameter indicates the total time, and the second parameter indicates the interval.
This means that the method onTick will be called back every second, And the onFinish method will be called back 30 seconds later.

Package com. androidcountdowntimer2; import android. app. activity; import android. OS. bundle; import android. OS. countDownTimer; import android. widget. textView;/*** Android countdown function implementation (CountDownTimer) * @ author zhongyao **/public class MainActivity extends Activity {private MyCount mc; private TextView TV; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); TV = (TextView) findViewById (R. id. show); mc = new MyCount (30000,100 0); mc. start ();}/* defines an internal countdown class */class MyCount extends CountDownTimer {public MyCount (long millisInFuture, long countDownInterval) {super (millisInFuture, countDownInterval );} @ Override public void onTick (long millisUntilFinished) {TV. setText ("Please wait:" + millisUntilFinished/1000 + "seconds... ") ;}@ Override public void onFinish () {TV. setText ("finish") ;}@override protected void onDestroy () {super. onDestroy (); mc. cancel ();}}