深入浅出 Android Service（2）-优快云博客

第二种是通过绑定Activity的方式来启动Service。先看流程图。

绑定的方式和第一节的方式最大的不同就是在于，Activity可以和Service实现关联，当被关联的Activity结束后，相应的Service也会停止，同时在绑定了的Activity中我们还可以回调我们在Service中定义的方法。在这里我们使用了this.bindService(intent, myServiceConnection, Context.BIND_AUTO_CREATE);来启动Service，当Service创建了同时绑定了Activity之后，会回调我们定义的ServiceConnection()，从而传回IBinder接口，我们就能够调用Service中的方法了。这时候Activity就和Service实现了绑定，Activity退出了Service就相应的退出了。Service的申明如下，intent filter 是对接收Service的过滤。

<intent-filter>

</intent-filter>

</service>

主要代码如下：

Acitivity

/** * BinderMusicPlayerActivity.java * com.androidtest.activity.musicplayer * * Function： TODO * * ver date author * ────────────────────────────────── * 2011-5-17 Leon * * Copyright (c) 2011, 最牛网 All Rights Reserved. */ package com.zuiniuwang.playeractivity; import android.app.Activity; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import com.zuiniuwang.MyMediaController; import com.zuiniuwang.R; import com.zuiniuwang.service.BindMusicService; import com.zuiniuwang.service.MyBinder; /** * ClassName:BinderMusicPlayerActivity Function: TODO ADD FUNCTION Reason: TODO * ADD REASON * * @author Leon * @version * @since Ver 1.1 * @Date 2011-5-17 */ public class BinderMusicPlayerActivity extends Activity implements OnClickListener { private static final String TAG = BinderMusicPlayerActivity.class .getSimpleName(); private BindMusicService bindMusicService; private Button playButton, pauseButton, stopButton, closeActivityButton, exitActivityButton; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); Log.v(TAG , TAG+"onCreate()"); this.setContentView(R.layout.music_player_layout); findViews(); bindViews(); connection(); } private void findViews() { playButton = (Button) this.findViewById(R.id.play); pauseButton = (Button) this.findViewById(R.id.pause); stopButton = (Button) this.findViewById(R.id.stop); closeActivityButton = (Button) this.findViewById(R.id.close); exitActivityButton = (Button) this.findViewById(R.id.exit); } private void bindViews() { playButton.setOnClickListener(this); pauseButton.setOnClickListener(this); stopButton.setOnClickListener(this); closeActivityButton.setOnClickListener(this); exitActivityButton.setOnClickListener(this); } private void connection() { Log.v(TAG , TAG+"connection"); Intent intent = new Intent("com.androidtest.service.mediaplayer.BindMusicService"); this.bindService(intent, myServiceConnection, Context.BIND_AUTO_CREATE); } public void onClick(View view) { // TODO Auto-generated method stub // TODO Auto-generated method stub switch (view.getId()) { case R.id.play: Log.d(TAG, "play......."); MyMediaController.play.execute(); break; case R.id.pause: Log.d(TAG, "pause......."); MyMediaController.pause.execute(); break; case R.id.stop: Log.d(TAG, "stop......."); MyMediaController.stop.execute(); break; case R.id.close: Log.d(TAG, "close......."); this.finish(); break; case R.id.exit: Log.d(TAG, "exit......."); this.finish(); this.stopService(new Intent("com.androidtest.service.mediaplayer.BindMusicService")); } } //调用bindService后 Service调用onBind()后回调此函数 private ServiceConnection myServiceConnection = new ServiceConnection() { public void onServiceConnected(ComponentName name, IBinder binder) { Log.v(TAG , TAG+ "onServiceConnected"); // TODO Auto-generated method stub bindMusicService = ((MyBinder)binder).getService(); //给Controller设置Service初始化的MediaPlayer MyMediaController.mediaPlayer=bindMusicService.getMyMediaPlayer(); } public void onServiceDisconnected(ComponentName name) { // TODO Auto-generated method stub bindMusicService=null; Log.v(TAG, "..............onServiceDisconnected"); } }; //当Activity finish时必须解绑不然会出现溢出 public void finish() { // TODO Auto-generated method stub super.finish(); this.unbindService(myServiceConnection); } }

Service：

/** * BindMusicService.java * com.androidtest.service.mediaplayer * * Function： TODO * * ver date author * ────────────────────────────────── * 2011-5-16 Leon * * Copyright (c) 2011, 最牛网 All Rights Reserved. */ package com.zuiniuwang.service; import com.zuiniuwang.R; import android.app.Service; import android.content.Intent; import android.media.MediaPlayer; import android.os.IBinder; import android.util.Log; /** * ClassName:BindMusicService * Function: TODO ADD FUNCTION * Reason: TODO ADD REASON * * @author Leon * @version * @since Ver 1.1 * @Date 2011-5-16 */ public class BindMusicService extends Service { private static final String TAG = BindMusicService.class.getSimpleName(); private MediaPlayer myMediaPlayer ; private IBinder binder = new MyBinder(this); public MediaPlayer getMyMediaPlayer() { return myMediaPlayer; } public void setMyMediaPlayer(MediaPlayer myMediaPlayer) { this.myMediaPlayer = myMediaPlayer; } @Override public IBinder onBind(Intent intent) { Log.v(TAG, TAG+" onBind"); // TODO Auto-generated method stub return binder; } @Override public void onCreate() { // TODO Auto-generated method stub super.onCreate(); if(myMediaPlayer==null){ myMediaPlayer=MediaPlayer.create(this, R.raw.test) ; myMediaPlayer.setLooping(false); } Log.v(TAG , TAG +" onCreate()"); } @Override public void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); Log.v(TAG, TAG+"onDestroy()"); if(myMediaPlayer!=null){ myMediaPlayer.stop(); myMediaPlayer.release(); } } //通过bindService的方式，onStart函数不会调用 @Override public void onStart(Intent intent, int startId) { // TODO Auto-generated method stub super.onStart(intent, startId); Log.v(TAG, TAG+" onStart()"); } @Override public boolean onUnbind(Intent intent) { // TODO Auto-generated method stub Log.v(TAG , TAG +" onUnbind ，成功没有？" ); return false; } @Override public void onRebind(Intent intent) { // TODO Auto-generated method stub Log.v(TAG , TAG +" onRebind()----------------------------------->"); super.onRebind(intent); } } 绑定时用到的Binder类

/** * MyBinder.java * com.androidtest.service.mediaplayer * * Function： TODO * * ver date author * ────────────────────────────────── * 2011-5-17 Leon * * Copyright (c) 2011, TNT All Rights Reserved. */ package com.zuiniuwang.service; import android.os.Binder; /** * ClassName:MyBinder Function: TODO ADD FUNCTION Reason: TODO ADD REASON * * @author Leon * @version * @since Ver 1.1 * @Date 2011-5-17 */ public class MyBinder extends Binder { private BindMusicService bindMusicService; public MyBinder(BindMusicService bindMusicService) { this.bindMusicService = bindMusicService; }; public BindMusicService getService() { return bindMusicService; } }
本节的源代码可以在此下载：http://download.youkuaiyun.com/detail/internetman/3967654 自己没有分了所以设置了需要分数才能下载，呵呵