Android正序倒计时

countDownTimer = new CountDownTimer(15000, 1000) {
            /**
             * 当前任务每完成一次倒计时间隔时间时回调
             * @param millisUntilFinished
             */
            public void onTick(long millisUntilFinished) {
                long ltime = millisUntilFinished / 1000;
                ltime = 15 - ltime;
                tvTimer.setText("00:" + ltime);
                if (ltime <= 9) {
                    tvTimer.setText("00:" + "0" + ltime);
                }
            }

            /**
             * 倒计时完成后回调
             */
            public void onFinish() {
                endRecord();//停止录音
                cancel();//关闭倒计时
            }
        }.start();