Android analogclock怎样实现时间倒计时

?Android?,?????????????????,?????CountDownTimer????????????,????????????,????????????:

1. ???????: ???AndroidManifest.xml???,??????(????):

2. ??????: ???res/layout???,????????(??activity_main.xml),?????AnalogClock???TextView??????:

3. ???????: ???MainActivity.java???,???????:

   import android.os.Bundle;
   import android.os.CountDownTimer;
   import android.widget.AnalogClock;
   import android.widget.TextView;
   import androidx.appcompat.app.AppCompatActivity;
   
   public class MainActivity extends AppCompatActivity {
   
       private AnalogClock analogClock;
       private TextView timerTextView;
       private CountDownTimer countDownTimer;
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
   
           analogClock = findViewById(R.id.analogClock);
           timerTextView = findViewById(R.id.timerTextView);
   
           // ?????????(??,?????????10?)
           long endTimeMillis = System.currentTimeMillis() + 10000;
   
           // ?????
           countDownTimer = new CountDownTimer(endTimeMillis, 1000) {
               @Override
               public void onTick(long millisUntilFinished) {
                   // ???????
                   long seconds = (millisUntilFinished / 1000) % 60;
                   timerTextView.setText(String.format("d:d", seconds / 60, seconds % 60));
               }
   
               @Override
               public void onFinish() {
                   // ?????????
                   timerTextView.setText("00:00");
               }
           }.start();
       }
   
       @Override
       protected void onDestroy() {
           super.onDestroy();
           // ??????,?????
           if (countDownTimer != null) {
               countDownTimer.cancel();
           }
       }
   }
   

??????,???????CountDownTimer??,??????????10??onTick??????????????,?onFinish??????????????

???,?????????????,?????????????????,?????????????????????,????????????????