public synchronized final void pause() {
        if (isStop) return ;

        isPause = true;
        mPauseTimeInFuture = mStopTimeInFuture - SystemClock.elapsedRealtime();
        mHandler.removeMessages(MSG);
    }
public synchronized final void pause ( ) { if ( isStop ) return ; isPause = true ; mPauseTimeInFuture = mStopTimeInFuture - SystemClock . elapsedRealtime ( ) ; mHandler . removeMessages ( MSG ) ; }
暂时倒计时
调用{@link #restart()}方法重新开始