Android的Proxy-Stub设计模式

package com.example.test1;

public interface IPlayer

{

void play();

void stop();

String getStatus();

}

 

package com.example.test1;

import android.os.IBinder;

import android.os.Parcel;

/**

 * 代理 负责发送信令

 * @author chenhan

 *

 */

public class PlayerProxy implements IPlayer{

private IBinder ib;

private String mStatus;

PlayerProxy(IBinder ibinder)

{

ib = ibinder;

}

public void play()

{

Parcel data = Parcel.obtain();

Parcel reply = Parcel.obtain();

data.writeString("playing");

try

{

ib.transact(1, data, reply, 0);

mStatus = reply.readString();

}

catch (Exception e)

{

e.printStackTrace();

}

}

@Override

public void stop()

{

// TODO 自动生成的方法存根

Parcel data = Parcel.obtain();

Parcel reply = Parcel.obtain();

data.writeString("stop");

try

{

ib.transact(2, data, reply, 0);

mStatus = reply.readString();

}

catch (Exception e)

{

e.printStackTrace();

}

}

@Override

public String getStatus()

{

// TODO 自动生成的方法存根

return mStatus;

}

}

 

package com.example.test1;

 

import android.os.Binder;

import android.os.Parcel;

import android.util.Log;

 

/**

 * 接收信令 进行处理

 * @author chenhan

 *

 */

 

public abstract class PlayerStubextends Binder implements IPlayer

{

@Override

public boolean onTransact(int code, Parcel data, Parcel reply,int flags) throws android.os.RemoteException

{

reply.writeString(data.readString()+ " mp3");

if(code == 1)

{

Log.e("PlayerStub", "PlayerStub : play");

this.play();

}

else if(code == 2)

{

Log.e("PlayerStub", "PlayerStub : stop");

this.stop();

}

return true;

}

public abstract void play();

public abstract void stop();

public abstract String getStatus();

}

 

package com.example.test1;

import android.content.Context;

import android.media.MediaPlayer;

import android.os.Binder;

import android.os.Message;

import android.os.Parcel;

import android.util.Log;

/**

 * 实现具体方法

 * @author chenhan

 *

 */

public class mp3Binder extends PlayerStub

{

private MediaPlayer mPlayer = null;

private Context ctx;

public mp3Binder(Context cx)

{

ctx= cx;

}

public void play()

{

//if(mPlayer != null)

//return;

//mPlayer = MediaPlayer.create(ctx, null);

try

{

//mPlayer.start();

Log.e("mp3Binder", "mp3Binder : play");

}

catch (Exception e)

{

Log.e("StartPlay", "error: " + e.getMessage(), e);

}

}

public void stop()

{

Log.e("mp3Binder", "mp3Binder : stop");

if (mPlayer != null)

{

//mPlayer.stop();

//mPlayer.release();

mPlayer = null;

}

}

public String getStatus()

{

return null;

}

}

 

package com.example.test1;

import android.app.Service;

import android.content.Intent;

import android.os.IBinder;

import android.util.Log;

 

public class mp3RemoteService extends Service {

private IBinder mBinder = null;

@Override

public void onCreate()

{

Log.e("mp3RemoteService", "mp3RemoteService : start");

mBinder = new mp3Binder(getApplicationContext());

}

@Override

public IBinder onBind(Intent intent)

{

return mBinder;

}

}

 

<service android:name="com.example.test1.mp3RemoteService" android:process=":remote" > 

            <intent-filter> 

                <action android:name ="com.misoo.pk01.REMOTE_SERVICE" /> 

            </intent-filter>

        </service>

private IPlayer pProxy = null;

private ServiceConnectionmConnection =new ServiceConnection() {

public void onServiceConnected(ComponentName className, IBinder ibinder) {

pProxy = new PlayerProxy(ibinder);

if(pProxy ==null)

{

Log.e("MainActivity", "pProxy null");

}

else

{

Log.e("MainActivity", "pProxy notnull");

pProxy.play();

}

Log.e("MainActivity", "pProxy aaaa");

}

 

@Override

public void onServiceDisconnected(ComponentName name)

{

// TODO 自动生成的方法存根

}

};

bindService(new Intent("com.misoo.pk01.REMOTE_SERVICE"),

         mConnection, Context.BIND_AUTO_CREATE);

 

startService(new Intent("com.misoo.pk01.REMOTE_SERVICE"));//Activity销毁Service还存在

        bindService(new Intent("com.misoo.pk01.REMOTE_SERVICE"),

         mConnection, Context.BIND_AUTO_CREATE);//Activity销毁Service也销毁