手机验证码倒计时

1.定义工具类CountDownTimerUtils

  

package com.haoniuchina.HaoniuKidsTeacher.util;

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

/**
 * Created by Administrator on 2016/10/19.
 */

    //package com.jackie.countdowntimer;

    import android.graphics.Color;
    import android.os.CountDownTimer;
    import android.text.Spannable;
    import android.text.SpannableString;
    import android.text.style.ForegroundColorSpan;
    import android.widget.TextView;

import com.haoniuchina.HaoniuKidsTeacher.R;

/**
     * Created by hhc on 2016/11/30.
     */
    public class CountDownTimerUtils extends CountDownTimer {
        private TextView mTextView;

        /**
         * @param textView          The TextView
         *
         *
         * @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 receiver
         *                          {@link #onTick(long)} callbacks.
         */
        public CountDownTimerUtils(TextView textView, long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);
            this.mTextView = textView;
        }

        @Override
        public void onTick(long millisUntilFinished) {
            mTextView.setClickable(false); //设置不可点击
            mTextView.setText(millisUntilFinished / 1000 + "秒后可重新发送");  //设置倒计时时间
            mTextView.setBackgroundResource(R.drawable.bg_identify_code_press); //设置按钮为灰色，这时是不能点击的

            /**
             * 超链接 URLSpan
             * 文字背景颜色 BackgroundColorSpan
             * 文字颜色 ForegroundColorSpan
             * 字体大小 AbsoluteSizeSpan
             * 粗体、斜体 StyleSpan
             * 删除线 StrikethroughSpan
             * 下划线 UnderlineSpan
             * 图片 ImageSpan
             * http://blog.csdn.net/ah200614435/article/details/7914459
             */
            SpannableString spannableString = new SpannableString(mTextView.getText().toString());  //获取按钮上的文字
            ForegroundColorSpan span = new ForegroundColorSpan(Color.RED);
            /**
             * public void setSpan(Object what, int start, int end, int flags) {
             * 主要是start跟end，start是起始位置,无论中英文，都算一个。
             * 从0开始计算起。end是结束位置，所以处理的文字，包含开始位置，但不包含结束位置。
             */
            spannableString.setSpan(span, 0, 2, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);//将倒计时的时间设置为红色
            mTextView.setText(spannableString);
        }

        @Override
        public void onFinish() {
            mTextView.setText("获取验证码");
            mTextView.setClickable(true);//重新获得点击
            mTextView.setBackgroundResource(R.drawable.bg_identify_code_normal);  //还原背景色
        }
    }

2.在代码中使用
   

//倒计时按钮 getCode是获取验证码的按钮，通过findviewbyid找到，60000是60秒，10000是时间间隔
CountDownTimerUtils mCountDownTimerUtils = new CountDownTimerUtils(getCode, 60000, 1000);
mCountDownTimerUtils.start();

3.背景资源
drawable/bg_identify_code_normal.xml

xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#f5d34a" /> 
    <corners android:radius="8dp" />  
shape>
drawable/bg_identify_code_press.xml

xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#C0C0C0" /> 
    <corners android:radius="8dp" />  
shape>