实现一个按钮自动倒计时的功能

安卓开发经常遇到获取验证码，实现按钮倒计时的功能
实现起来也很简单，利用系统自带的定时器来实现，下面给出实测代码

调用也很简单
CountDownTimerUtils countDownTimerUtils = new CountDownTimerUtils(mTextView, 60000, 1000);
在点击这个按钮的时候调用启动就可以了
mTextView.setOnClickListener(v -> {
countDownTimerUtils.start();
});

下面就是封装的类，哪里需要直接调用就可以了

package com.ceq.core.utils.core;

import android.os.CountDownTimer;
import android.widget.TextView;

/**

• 不带记忆功能的倒计时
  */
  public class CountDownTimerUtils extends CountDownTimer {

  /**

  • @param millisInFuture The number of millis in the future from the call
  • to {@link #start()} until the countdown is done and {@link #onFinish()}
  • is called.
  • @param countDownInterval The interval along the way to receive
  • {@link #onTick(long)} callbacks.
    */
    private TextView textView;

  public CountDownTimerUtils(TextView textView, long millisInFuture, long countDownInterval) {
  super(millisInFuture, countDownInterval);
  this.textView = textView;
  }

  @Override
  public void onTick(long millisUntilFinished) {
  textView.setClickable(false);
  textView.setText(“剩余” + millisUntilFinished / 1000 + “s”);
  }

  @Override
  public void onFinish() {
  textView.setClickable(true);
  textView.setText(“获取验证码”);
  }
  }