简单实现倒计时功能

	/** 倒计时60秒，一次1秒 */
	CountDownTimer timer = new CountDownTimer(61*1000, 1000) {
		@Override
		public void onTick(long millisUntilFinished) {
			// TODO Auto-generated method stub
			textView.setText(millisUntilFinished/1000+"秒");

		}

		@Override
		public void onFinish() {
		//textView.setText("时间已到,请重新获取验证码!!!");
			
		}
	}.start();