Android登陆页面，获取验证码按钮的实现

1.在xml文件中定义一个TextView

2.自定义类实现CountDownTimer，例如

class TimeCount extends CountDownTimer {
public TimeCount(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);//参数依次为总时长,和计时的时间间隔
}
@Override
public void onFinish() {//计时完毕时触发
btn_send.setText("重新发送");
btn_send.setClickable(true);
}
@Override
public void onTick(long millisUntilFinished){//计时过程显示
btn_send.setClickable(false);
btn_send.setText(millisUntilFinished /1000+"秒后重发");
}
}

3.在代码初始化对象

TimeCoutn time = new TimeCount(60000,1000);

4.在TextView的点击事件中调用

time.start();