Android Service的思考（2）

第二种是通过绑定的方式来启动Service。先看流程图，点击放大。

 

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 android:enabled="true" android:name=".service.mediaplayer.BindMusicService"> <intent-filter> <action android:name="com.androidtest.service.mediaplayer.BindMusicService" /> </intent-filter> </service>

 

 

主要代码如下：

^?[Copy to clipboard] Download zuiniuwang.java

 

/**
 * BinderMusicPlayerActivity.java
 * com.androidtest.activity.musicplayer
 *
 * Function： TODO
 *
 *   ver     date           author
 * ──────────────────────────────────
 *           2011-5-17      Leon
 *
 * Copyright (c) 2011, TNT All Rights Reserved.
 */

package com.androidtest.activity.musicplayer;

import com.androidtest.R;
import com.androidtest.service.mediaplayer.BindMusicService;
import com.androidtest.service.mediaplayer.MyBinder;
import com.androidtest.service.mediaplayer.MyMediaController;

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;

/**
 * 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.startService(intent);
        this.bindService(intent, myServiceConnection, Context.BIND_AUTO_CREATE);

    }

    @Override
    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() {

        @Override
        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();

        }

        @Override
        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);

    }

}

/**
 * BindMusicService.java
 * com.androidtest.service.mediaplayer
 *
 * Function： TODO
 *
 *   ver     date           author
 * ──────────────────────────────────
 *           2011-5-16      Leon
 *
 * Copyright (c) 2011, TNT All Rights Reserved.
*/

package com.androidtest.service.mediaplayer;

import com.androidtest.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？" + super.onUnbind(intent));
        return true;

    }

    @Override
    public void onRebind(Intent intent) {

        // TODO Auto-generated method stub
        Log.v(TAG , TAG +" onRebind()----------------------------------->");
        super.onRebind(intent);

    }

}

/**
 * MyBinder.java
 * com.androidtest.service.mediaplayer
 *
 * Function： TODO
 *
 *   ver     date           author
 * ──────────────────────────────────
 *           2011-5-17      Leon
 *
 * Copyright (c) 2011, TNT All Rights Reserved.
 */

package com.androidtest.service.mediaplayer;

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;
    }

 

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