package com.example.daojishi; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.os.CountDownTimer; 
import android.util.Log; 
import android.view.View; 
import android.widget.TextView; 
import android.widget.Toast; 
 
/** 
 * 
 * @author baozi 
 * 
 * 倒计时的类 CountDownTimer 
 * 
 */ 
public class MainActivity extends Activity { 
 
  private MyCountDownTimer mc; 
  private TextView tv; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    tv = (TextView) findViewById(R.id.show); 
    mc = new MyCountDownTimer(30000, 1000); 
    mc.start(); 
  } 
 
  public void oncancel(View view) { 
    Toast.makeText(MainActivity.this, "取消", Toast.LENGTH_LONG).show();// toast有显示时间延迟 
    mc.cancel(); 
  } 
 
  public void restart(View view) { 
    Toast.makeText(MainActivity.this, "重新开始", Toast.LENGTH_LONG).show();// toast有显示时间延迟 
    mc.start(); 
  } 
 
  /** 
   * 继承 CountDownTimer 防范 
   * 
   * 重写 父类的方法 onTick() 、 onFinish() 
   */ 
 
  class MyCountDownTimer extends CountDownTimer { 
    /** 
     * 
     * @param millisInFuture 
     *      表示以毫秒为单位 倒计时的总数 
     * 
     *      例如 millisInFuture=1000 表示1秒 
     * 
     * @param countDownInterval 
     *      表示 间隔 多少微秒 调用一次 onTick 方法 
     * 
     *      例如: countDownInterval =1000 ; 表示每1000毫秒调用一次onTick() 
     * 
     */ 
    public MyCountDownTimer(long millisInFuture, long countDownInterval) { 
      super(millisInFuture, countDownInterval); 
    } 
 
    @Override 
    public void onFinish() { 
      tv.setText("done"); 
    } 
 
    @Override 
    public void onTick(long millisUntilFinished) { 
      Log.i("MainActivity", millisUntilFinished + ""); 
      tv.setText("倒计时(" + millisUntilFinished / 1000 + ")..."); 
    } 
  } 
} 
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/* 
 * Copyright (C) 2008 The Android Open Source Project 
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 */ 
 
package android.os; 
 
import android.util.Log; 
 
/** 
 * Schedule a countdown until a time in the future, with 
 * regular notifications on intervals along the way. 
 * 
 * Example of showing a 30 second countdown in a text field: 
 * 
 * 
 * new CountDownTimer(30000, 1000) { 
 * 
 *   public void onTick(long millisUntilFinished) { 
 *     mTextField.setText("seconds remaining: " + millisUntilFinished / 1000); 
 *   } 
 * 
 *   public void onFinish() { 
 *     mTextField.setText("done!"); 
 *   } 
 * }.start(); 
 * 
 * 
 * The calls to {@link #onTick(long)} are synchronized to this object so that 
 * one call to {@link #onTick(long)} won't ever occur before the previous 
 * callback is complete. This is only relevant when the implementation of 
 * {@link #onTick(long)} takes an amount of time to execute that is significant 
 * compared to the countdown interval. 
 */ 
public abstract class CountDownTimer { 
 
  /** 
   * Millis since epoch when alarm should stop. 
   */ 
  private final long mMillisInFuture; 
 
  /** 
   * The interval in millis that the user receives callbacks 
   */ 
  private final long mCountdownInterval; 
 
  private long mStopTimeInFuture; 
 
  /** 
   * @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 CountDownTimer(long millisInFuture, long countDownInterval) { 
    mMillisInFuture = millisInFuture; 
    mCountdownInterval = countDownInterval; 
  } 
 
  /** 
   * Cancel the countdown. 
   */ 
  public final void cancel() { 
    mHandler.removeMessages(MSG); 
  } 
 
  /** 
   * Start the countdown. 
   */ 
  public synchronized final CountDownTimer start() { 
    if (mMillisInFuture