android多进程的几种通信方式二

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一．概述

　　　接着上一篇我们继续讲解多进程的通信方式，这一篇我们介绍Messenger(信使)，它是基于aidl之上封装了一层，类似thread和handler通信一样简单易使用，它与aidl不同之处就是只能传递基本数据类型，而aidl可以传递我们自定义的javabean．它的好处就是简单方便快捷，不需要和aidl一样新建aidl文件．

二．实例

　　　第一步　新建clientproject中的activity，如下

package com.test.client;import android.app.Activity;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.Handler;import android.os.IBinder;import android.os.Message;import android.os.Messenger;import android.os.RemoteException;import android.view.View;import android.widget.Button;import android.widget.TextView;public class MessengerActivity extends Activity {    private Button btn_get_data;    private TextView tv_content;    private Messenger mServiceMessenger;    private Messenger mClientMessenger;    private Handler mHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            String value = msg.getData().getString("key");            tv_content.setText(value);        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_messenger);        mClientMessenger = new Messenger(mHandler);        Intent mIntent = new Intent("com.test.server.service.MessengerService");        bindService(mIntent, mconn, BIND_AUTO_CREATE);        tv_content = (TextView) findViewById(R.id.tv_content);        btn_get_data = (Button) findViewById(R.id.btn_get_data);        btn_get_data.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Message msg = Message.obtain();                msg.what = 1;                try {                    if (mServiceMessenger != null) {                        //将客户端messenger信使赋值给服务端(为了方便接受回传过来的数据)                        msg.replyTo = mClientMessenger;                        //服务端信使发送数据                        mServiceMessenger.send(msg);                    }                } catch (RemoteException e) {                    e.printStackTrace();                }            }        });    }    private ServiceConnection mconn = new ServiceConnection() {        @Override        public void onServiceConnected(ComponentName name, IBinder service) {            //获取服务端的messenger信使            mServiceMessenger = new Messenger(service);        }        @Override        public void onServiceDisconnected(ComponentName name) {        }    };    @Override    protected void onDestroy() {        super.onDestroy();        unbindService(mconn);    }}

第二步　新建serverproject中的service，用来接受客户端发送过来的数据并处理然后返回数据给客户端

package com.test.server.service;import android.app.Service;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import android.os.HandlerThread;import android.os.IBinder;import android.os.Message;import android.os.Messenger;import android.os.RemoteException;import android.support.annotation.Nullable;import android.util.Log;public class MessengerService extends Service {    public static final String TAG = "MessengerService";    public static final int MSG_GET = 1;    private Messenger mMessenger = new Messenger(new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case MSG_GET:                    //获取客户端的messenger                    Messenger clientMessenger = msg.replyTo;                    if (clientMessenger != null) {                        Message newMsg = Message.obtain();                        try {                            Bundle bundle = new Bundle();                            bundle.putString("key", "MessengerService服务端回传的数据");                            newMsg.setData(bundle);                            clientMessenger.send(newMsg);                        } catch (RemoteException e) {                            e.printStackTrace();                        }                    }                    break;            }        }    });    @Nullable    @Override    public IBinder onBind(Intent intent) {        return mMessenger.getBinder();    }    }

不要忘记在androidManifests.xml文件中注册

<service android:name=".service.MessengerService">            <intent-filter>                <action android:name="com.test.server.service.MessengerService" />                <category android:name="android.intent.category.DEFAULT" />            </intent-filter>        </service>

到此结束了所有编码，想比较aidl，Messenger的使用方式更加简单，当然咯，仅限于基本数据类型

附上demo下载链接   http://download.csdn.net/detail/u010648159/9625027

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