Android获取验证码倒计时显示效果

package com.example.nanchen.timerdemo;

import android.os.Bundle;
import android.os.CountDownTimer;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

 private Button mBtnGetCode;
 private TimeCount mTimeCount;
 private Button mBtnGetCode2;
 private boolean timeFlag = true;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 mBtnGetCode = (Button) findViewById(R.id.main_btn_get_code);
 mBtnGetCode.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
  mTimeCount = null;
  mTimeCount = new TimeCount(60 * 1000, 1000);
  mTimeCount.start();
  }
 });

 mBtnGetCode2 = (Button) findViewById(R.id.main_btn_get_code_2);
 mBtnGetCode2.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
  mBtnGetCode2.setClickable(false);
  mBtnGetCode2.setBackgroundColor(getResources().getColor(R.color.btn_unable));
  timeFlag = true;
  new Thread() {
   @Override
   public void run() {
   super.run();
   for (int i = 59; i >= 0 && timeFlag; i--) {
    try {
    sleep(1000);
    Message msg = Message.obtain();
    msg.what = i;
    mHandler.sendMessage(msg);
    } catch (InterruptedException e) {
    e.printStackTrace();
    }
   }
   }
  }.start();
  }
 });
 }

 private Handler mHandler = new Handler() {
 @Override
 public void handleMessage(Message msg) {
  super.handleMessage(msg);
  if (msg.what > 0) {
  mBtnGetCode2.setText("(" + msg.what + ")秒后重试");
  } else {
  mBtnGetCode2.setText("获取验证码");
  mBtnGetCode2.setClickable(true);
  mBtnGetCode2.setBackgroundColor(getResources().getColor(R.color.colorAccent));
  }
 }


 };


 /**
 * Activity 销毁的时候注意把所有引用置为空，防止内存泄漏
 */
 @Override
 protected void onDestroy() {
 super.onDestroy();
 mTimeCount = null;
 timeFlag = false;
 }

 /**
 * 实现倒计时的类
 */
 private class TimeCount 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.
  */
 public TimeCount(long millisInFuture, long countDownInterval) {
  super(millisInFuture, countDownInterval);
 }

 /**
  * 计时过程显示 按钮不可用 设置为灰色
  *
  * @param millisUntilFinished
  */
 @Override
 public void onTick(long millisUntilFinished) {
  mBtnGetCode.setClickable(false);
  mBtnGetCode.setBackgroundColor(getResources().getColor(R.color.btn_unable));
  mBtnGetCode.setText("(" + millisUntilFinished / 1000 + ")秒后重试");
 }

 /**
  * 计时结束调用
  */
 @Override
 public void onFinish() {
  mBtnGetCode.setClickable(true);
  mBtnGetCode.setText("获取验证码方式1");
  mBtnGetCode.setBackgroundColor(getResources().getColor(R.color.colorPrimaryDark));
 }
 }


}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.example.nanchen.timerdemo.MainActivity">

 <Button
 android:layout_marginTop="10dp"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:id="@+id/main_btn_get_code"
 android:text="获取验证码方式1"
 android:background="@color/colorPrimaryDark"/>

 <TextView
 android:layout_width="match_parent"
 android:layout_height="1dp"
 android:id="@+id/main_line1"
 android:background="@color/btn_unable"
 android:layout_below="@+id/main_btn_get_code"
 android:layout_marginTop="10dp"/>

 <Button
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_below="@+id/main_line1"
 android:layout_marginTop="10dp"
 android:text="获取验证码方式2"
 android:id="@+id/main_btn_get_code_2"
 android:background="@color/colorAccent"/>

</RelativeLayout>