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 + ")秒后重試");  } else {  mBtnGetCode2.setText("獲取驗證碼");  mBtnGetCode2.setClickable(true);  mBtnGetCode2.setBackgroundColor(getResources().getColor(R.color.colorAccent));  } } }; /** * Activity 銷毀的時候注意把所有引用置為空，防止內存泄漏 */ @Override protected void onDestroy() { super.onDestroy(); mTimeCount = null; timeFlag = false; } /** * 實現倒計時的類 */ 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); } /**  * 計時過程顯示 按鈕不可用 設置為灰色  *  * @param millisUntilFinished  */ @Override public void onTick(long millisUntilFinished) {  mBtnGetCode.setClickable(false);  mBtnGetCode.setBackgroundColor(getResources().getColor(R.color.btn_unable));  mBtnGetCode.setText("(" + millisUntilFinished / 1000 + ")秒后重試"); } /**  * 計時結束調用  */ @Override public void onFinish() {  mBtnGetCode.setClickable(true);  mBtnGetCode.setText("獲取驗證碼方式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="獲取驗證碼方式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="獲取驗證碼方式2" android:id="@+id/main_btn_get_code_2" android:background="@color/colorAccent"/></RelativeLayout>