Android应用开发揭秘的第4个程序3_3_MusicService修改版和高仿版的源码注释

//利用Service播放mp3

Activity01.java

//公司的模拟器2.1版本不能运行.4.0.3可以运行但音乐断断续续,多重播放时不断续
package com.MusicService;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Activity01 extends Activity
{
 public void onCreate(Bundle savedInstanceState)
 {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  
  //从main.xml布局中获得Button对象
  Button button_start = (Button)findViewById(R.id.start);
  Button button_stop = (Button)findViewById(R.id.stop);
  //设置按钮（Button）监听
  button_start.setOnClickListener(start);
        button_stop.setOnClickListener(stop);

 }
 
 //开始按钮
 private OnClickListener start = new OnClickListener()
    {
        public void onClick(View v)
        {  
         //开启Service
         
         //在文件AndroidManifest.xml中定义如下服务
         //
            //
            startService(new Intent("com.MusicService.MUSIC"));
        }
    };
   //停止按钮
    private OnClickListener stop = new OnClickListener()
    {
        public void onClick(View v)
        {
         //停止Service
            stopService(new Intent("com.MusicService.MUSIC"));      
        }
    };

}

MusicService.java

 

package com.MusicService;

import android.app.Service; //为了引进类 Service
import android.content.Intent;
import android.media.MediaPlayer; //为了引进MediaPlayer player;
import android.os.IBinder; //为了引进Intent arg0

public class MusicService extends Service
{
 //MediaPlayer对象
 private MediaPlayer player;

 public IBinder onBind(Intent arg0)
 {
  return null;
 }

 public void onStart(Intent intent, int startId)
 {
  super.onStart(intent, startId);
  //这里可以理解为装载音乐文件
  player = MediaPlayer.create(this, R.raw.test);
  //开始播放
  player.start();
 }

 public void onDestroy()
 {
  super.onDestroy();
  //停止音乐-停止Service
  player.stop();
 }

}

 

AndroidManifest.xml

      package="com.MusicService"
      android:versionCode="1"
      android:versionName="1.0">
   
                          android:label="@string/app_name">
           
               
               
           
       
       
         
             
             
         
         
   
   

 

 

 

Gf_MusicServiceActivity.java

package packagename.Gf_MusicService;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Gf_MusicServiceActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
  //从main.xml布局中获得Button对象
  Button button_start = (Button)findViewById(R.id.start);
  Button button_stop = (Button)findViewById(R.id.stop);
  //设置按钮（Button）监听
  button_start.setOnClickListener(start);
        button_stop.setOnClickListener(stop);
    }
   
 //开始按钮
 private OnClickListener start = new OnClickListener()
    {
        public void onClick(View v)
        {  
         //开启Service
         
         //在文件AndroidManifest.xml中定义如下服务
         //
            //
            startService(new Intent("com.GfMusicService.MUSIC"));
        }
    };
   //停止按钮
    private OnClickListener stop = new OnClickListener()
    {
        public void onClick(View v)
        {
         //停止Service
            stopService(new Intent("com.GfMusicService.MUSIC"));      
        }
    };
}

package packagename.Gf_MusicService;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;

public class GfMusicService extends Service
{
 //MediaPlayer对象
 private MediaPlayer player;

 public IBinder onBind(Intent arg0)
 {
  return null;
 }

 public void onStart(Intent intent, int startId)
 {
  super.onStart(intent, startId);
  //这里可以理解为装载音乐文件
  player = MediaPlayer.create(this, R.raw.test);
  //开始播放
  player.start();
 }

 public void onDestroy()
 {
  super.onDestroy();
  //停止音乐-停止Service
  player.stop();
 }

}

AndroidManifest.xml

 

    package="packagename.Gf_MusicService"
    android:versionCode="1"
    android:versionName="1.0" >

   

            android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
                    android:name=".Gf_MusicServiceActivity"
            android:label="@string/app_name" >
           
               

               
           
       
       
        
         
             
             
         
       
       
   

 

GfMusicService.java