Android自定义Timer实现发送手机验证码倒计时

Android自定义Timer实现发送手机验证码倒计时，继承自CountDownTimer来实现该功能。

public class TimeCount extends CountDownTimer {

    private TextView textView;

    //参数依次为总时长和计时的时间间隔
    //写死倒计时结束是60s，即：millisInFuture = 60000
    //间隔为1s，即：countDownInterval = 1000
    public TimeCount(TextView textView) {
        super(60_000L, 1_000L);
        this.textView = textView;
    }

    //计时过程显示
    @Override
    public void onTick(long millisUntilFinished) {
        String time = "(" + millisUntilFinished / 1_000L + "s)";
        setButtonInfo(time, false);
    }

    //计时完毕时触发
    @Override
    public void onFinish() {
        setButtonInfo("获取验证码", true);
    }

    /**
     * 验证按钮在点击前后相关设置
     *
     * @param content 要显示的内容
     * @param isClick 是否可点击
     */
    private void setButtonInfo(String content, boolean isClick) {
        if (textView != null) {
            textView.setText(content);
            textView.setClickable(isClick);
        }
    }

}

使用 timeCount.start();来调用开始倒计时