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CountDownTimer

代码片.

// An highlighted blockprivate MyCountDownTimer  timer;private final long TIME = 7 * 1000L;private final long INTERVAL = 1000L;private  class  MyCountDownTimer extends CountDownTimer{/*** @param millisInFuture    The number of millis in the future from the call*                          to {@link #start()} until the countdown is done and {@link #onFinish()}*                          is called.* @param countDownInterval The interval along the way to receive*                          {@link #onTick(long)} callbacks.*/public MyCountDownTimer(long millisInFuture, long countDownInterval) {super(millisInFuture, countDownInterval);}@Overridepublic void onTick(long millisUntilFinished) {long time = millisUntilFinished / 1000;Log.e("wuzhang",time+"秒");}@Overridepublic void onFinish() {cancelTimer();adsAPI.startAds(QRSuccessActivity.this, adRequest);finish();}}/*** 开始倒计时*/private void startTimer() {if (timer == null) {timer = new MyCountDownTimer(TIME, INTERVAL);}timer.start();}/*** 取消倒计时*/private void cancelTimer() {if (timer != null) {timer.cancel();timer = null;}}

使用

代码片.

@Overrideprotected void onCreate(Bundle savedInstanceState) {startTimer();.......
}@Overrideprotected void onDestroy() {super.onDestroy();cancelTimer();}