Android开发之获取验证码倒计时

写在前面:
现在很多APP在获取验证码时都会有一个计时的功能,让小编带大家看一下计时是怎么实现的叭.
代码:

//创建倒计时对象(每隔一秒更新一次,共计60秒)
    MyCountDownTimer myCountDownTimer = new MyCountDownTimer(60000, 1000);

 //倒计时函数
    private class MyCountDownTimer extends CountDownTimer {
        public MyCountDownTimer(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
        }

        //计时过程
        @Override
        public void onTick(long l) {
            //防止计时过程中重复点击
            btnGetVerityNumber.setClickable(false);
            btnGetVerityNumber.setText(l / 1000 + "秒");
        }

        //计时完毕的方法
        @Override
        public void onFinish() {
            //重新给Button设置文字
            btnGetVerityNumber.setText("重新获取");
            //设置可点击
            btnGetVerityNumber.setClickable(true);
        }
    }

    //销毁倒计时
    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (myCountDownTimer != null) {
            myCountDownTimer.cancel();
            myCountDownTimer = null;
        }
    }
}