<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     tools:context="com.zzw.testmessenger.MainActivity" >

     <Button

         android:id="@+id/bind"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:layout_alignParentBottom="true"

         android:layout_alignParentLeft="true"

         android:text="绑定" />

     <Button

         android:id="@+id/send"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:layout_alignParentBottom="true"

         android:layout_alignParentRight="true"

         android:text="发送数据" />

     <Button

         android:id="@+id/start"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:layout_alignParentBottom="true"

         android:layout_centerHorizontal="true"

         android:text="加法" />

 </RelativeLayout>

activity_main.xml

 package com.zzw.testmessenger;

 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.util.Log;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.Button;

 public class MainActivity extends Activity implements OnClickListener {

     Button bind, send, start;

     ServiceConnection sc;

     Messenger sender, receiver;

     int sum;

     Handler handler;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         bind = (Button) findViewById(R.id.bind);

         bind.setOnClickListener(this);

         send = (Button) findViewById(R.id.send);

         send.setOnClickListener(this);

         start = (Button) findViewById(R.id.start);

         start.setOnClickListener(this);

         handler = new Handler() {

             @Override

             public void handleMessage(Message msg) {

                 super.handleMessage(msg);

                 if (msg.what == 1) {

                     int sum = (Integer) msg.obj;

                     Log.d("收到服务器传来的消息--->", sum + "");

                 }

             }

         };

         //activity接收serviece的数据的接收者

         receiver = new Messenger(handler);

     }

     @Override

     public void onClick(View v) {

         switch (v.getId()) {

         case R.id.bind:

             bindService();

             break;

         case R.id.send:

             sendMessageToService();

             break;

         case R.id.start:

             StartService();

             break;

         }

     }

     private void bindService() {

         sc = new ServiceConnection() {

             @Override

             public void onServiceDisconnected(ComponentName name) {

             }

             @Override

             public void onServiceConnected(ComponentName name, IBinder service) {

                 //activity向serviece的发送数据的发送者

                 sender = new Messenger(service);

             }

         };

         Intent intent = new Intent(MainActivity.this, MessengerService.class);

         bindService(intent, sc, BIND_AUTO_CREATE);

     }

     private void StartService() {

         Intent it = new Intent(MainActivity.this, MessengerService.class);

         startService(it);

     }

     private void sendMessageToService() {

         try {

             Message msg = new Message();

             int a = (int) (Math.random() * 20);

             int b = (int) (Math.random() * 20);

             int s[] = { a, b };

             msg.what = 0;

             msg.obj = s;

             // 设置一个Messenger receiver，receiver是提供给Service使用来给Activity响应的目标。

             msg.replyTo = receiver;

             sender.send(msg);

             Log.d("sendMessageToService", "发送成功----->");

         } catch (RemoteException e) {

             e.printStackTrace();

         }

     }

     @Override

     protected void onDestroy() {

         unbindService(sc);

         Intent intent = new Intent(MainActivity.this, MessengerService.class);

         stopService(intent);

         super.onDestroy();

     }

 }

 package com.zzw.testmessenger;

 import android.app.Service;

 import android.content.Intent;

 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 MessengerService extends Service {

     private Messenger messenger, sender;

     Handler handler;

     int a, b, sum;

     @Override

     public void onCreate() {

         Log.d("MessengerSerivice", "onCreate");

         handler = new Handler() {

             @Override

             public void handleMessage(Message msg) {

                 super.handleMessage(msg);

                 if (msg.what == 0) {

                     int[] s = (int[]) msg.obj;

                     a = s[0];

                     b = s[1];

                     Log.d("从activity收到的msg", "a=" + a + "  b=" + b);

                 }

                 //service向activity发送数据的发送者

                 sender = msg.replyTo;

             }

         };

         //service接收activity的数据的接收者

         messenger = new Messenger(handler);

     }

     private void sendMessageToActivity(Messenger sender) {

         try {

             Message msg = new Message();

             msg.what = 1;

             msg.obj = sum;

             sender.send(msg);

             Log.d("sendMessageToActivity", "成功发送");

         } catch (RemoteException e) {

             // TODO Auto-generated catch block

             e.printStackTrace();

         }

     }

     @Override

     public int onStartCommand(Intent intent, int flags, int startId) {

         Log.d("MessengerSerivice", "onStartCommand");

         sum = a + b;

         Log.d("在onStartCommand中算出的和", sum + "");

         sendMessageToActivity(sender);

         return super.onStartCommand(intent, flags, startId);

     }

     @Override

     public IBinder onBind(Intent intent) {

         Log.d("MessengerSerivice", "onBind");

         return messenger.getBinder();

     }

 }