1、新建一个project,作为Service Module

Activity代码：不做变动

package com.pzhihao.textmessager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }}

新建一个service,和其他进程通信

服务端的信使通过onBind方法return的getBinder传递到客户端的ServiceConnection中，同时，服务端得到了客户端通过服务端messager传递过来的客户端messager,服务端用来给客户端回传数据

Myservice.java

package com.pzhihao.textmessager;import android.app.Service;import android.content.Intent;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.util.Log;public class MyService extends Service {    private static final int MSG_FROM_CLIENT = 1 ;    private static final int MSG_FROM_SERVER = 2 ;    private static final String TAG = "MyService";    public MyService() {    }    Messenger messenger=new Messenger(new Handler(){        @Override        public void handleMessage(Message msg) {            switch (msg.what){                case MSG_FROM_CLIENT:                    Bundle data = msg.getData();                    String msg1 = data.getString("clientmsg");                    Log.v(TAG,"收到客户端消息"+msg1);                    //得到客户端的信使                    Messenger clientmessenger = msg.replyTo;                    //封装消息                    Message replymsg=new Message();                    Bundle bundle=new Bundle();                    bundle.putString("servermsg","收到了您的消息！");                    replymsg.setData(bundle);                    replymsg.what=MSG_FROM_SERVER;                    try {                        //用客户端的信使给客户端发消息                        clientmessenger.send(replymsg);                    } catch (RemoteException e) {                        e.printStackTrace();                    }                    break;            }        }    });    @Override    public IBinder onBind(Intent intent) {        return messenger.getBinder();    }}

AndroidManifest.xml片段，服务注册

 

 

2、新建一个Module,作为客户端，向上一个app索取服务,客户端通过bind_service方法向服务端传递了数据，同时也将自己的messager传递了过去

ManiActivity.java

package com.pzhihao.client;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.os.Handler;import android.os.IBinder;import android.os.Message;import android.os.Messenger;import android.os.RemoteException;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;public class MainActivity extends AppCompatActivity {    private static final int MSG_FROM_CLIENT = 1 ;    private static final int MSG_FROM_SERVER = 2 ;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Intent intent=new Intent();        intent.setAction("pzhihao.Myservice");        intent.setPackage("com.pzhihao.textmessager");        bindService(intent,conn,BIND_AUTO_CREATE);    }    private Messenger mservice;    private Messenger clicntmessager=new Messenger(new Handler(){        @Override        public void handleMessage(Message msg) {            switch (msg.what){                case MSG_FROM_SERVER:                    Bundle data = msg.getData();                    String servermsg = data.getString("servermsg");                    Log.v("MainActivity","客户端收到服务端的反馈："+servermsg);                    break;            }        }    });    ServiceConnection conn=new ServiceConnection() {        @Override        public void onServiceConnected(ComponentName name, IBinder service) {            mservice=new Messenger(service);        }        @Override        public void onServiceDisconnected(ComponentName name) {        }    };    public void bind_sevice(View view) {        Message msg=Message.obtain();        Bundle bu=new Bundle();        bu.putString("clientmsg","客户端传来的消息");        msg.setData(bu);        msg.what=MSG_FROM_CLIENT;        //客户端从Service得到服务端的Messenger后，给服务端传递了消息，并把自己的Messenger带了过去        msg.replyTo=clicntmessager;        try {            mservice.send(msg);        } catch (RemoteException e) {            e.printStackTrace();        }    }}