1.最簡單的計時

    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {

        }
    }, 2000);

2.計時和循環(huán)

Runnable mRun;
Handler handler = new Handler();
private void setTimer2(){
    mRun = new Runnable() {
        @Override
        public void run() {
           //做的操作
        }
    };
    //想再次調(diào)用時可以調(diào)這個方法
    handler.postDelayed(mRun, 5000);
    //這個是注銷這個計時
    handler.removeCallbacks(mRun);
}

3.計時和循環(huán)

 Timer timer;
private void setTimer3(){
    timer = new Timer(false);
    timer.schedule(new TimerTask() {
        //此方法是在子線程中執(zhí)行的
        @Override
        public void run() {
            //更新時間
            //調(diào)回主頁
            TimeActivity.this.runOnUiThread(new TimerTask() {
                @Override
                public void run() {
                    //取消定時任務(wù)和界面操作
                    timer.cancel();
                }
            });
        }
    }, 0, 1000);
}

4.獲取當前時間的2中方法

private void getData1(){
      SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
    // HH:mm:ss獲取當前時間
    Date date = new Date(System.currentTimeMillis());
    tvTime.setText("Date獲取當前日期時間：：："+simpleDateFormat.format(date));

}
private void getData2(){
    Time mTime=new Time();
    mTime.setToNow(); // 取得系統(tǒng)時間。
    int year = mTime.year;
    int month = mTime.month+1;
    int day = mTime.monthDay;
    int hour = mTime.hour;
    int minute = mTime.minute;
    int second = mTime.second;
    tvTime2.setText("獲取當前日期:"+year+"年"+month+"月"+day+"月\n                         "+hour+"時:"+minute+"分:"+second+"秒");


}