Android利用CountDownTimer类实现倒计时功能
16lz
2021-01-23
public class MainActivity extends Activity {private MyCount mc;private TextView tv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tv = (TextView)findViewById(R.id.show); mc = new MyCount(70000, 1000); mc.start(); } class MyCount extends CountDownTimer{public MyCount(long millisInFuture, long countDownInterval) {super(millisInFuture, countDownInterval);System.out.println("你好");}@Overridepublic void onTick(long millisUntilFinished) {Date date = new Date(millisUntilFinished);SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss");String str = sdf.format(date);System.out.println(str);tv.setText("请等待70秒("+millisUntilFinished / 1000 +")...");}@Overridepublic void onFinish() {tv.setText("finish");} } @Override protected void onDestroy() { super.onDestroy(); mc.cancel(); }}
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