使用Messenger 从Activity发送数据到service 通过后台计算结果Log输出；

 package com.lixu.messenger;

 import android.app.Activity;
 import android.app.Service;
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.os.Bundle;
 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 {
     private ServiceConnection sc;
     private Messenger sender;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         Button btn1 = (Button) findViewById(R.id.btn1);
         Button btn2 = (Button) findViewById(R.id.btn2);

         btn1.setOnClickListener(this);
         btn2.setOnClickListener(this);

     }

     public void bindService() {
         sc = new ServiceConnection() {

             @Override
             public void onServiceDisconnected(ComponentName name) {

             }

             @Override
             public void onServiceConnected(ComponentName name, IBinder service) {
                 sender = new Messenger(service);
             }

         };
         Intent intent = new Intent(this, MyMessenger.class);
         bindService(intent, sc, Service.BIND_AUTO_CREATE);
         Log.e("开始绑定", "绑定成功");

     }

     public void startService() {
         Intent it = new Intent(this, MyMessenger.class);
         startService(it);
         Message msg = new Message();
         int[] num = { 309, 713 };
         msg.obj = num;
         msg.what = Changliang.WHAT;
         try {
             sender.send(msg);
         } catch (RemoteException e) {
             e.printStackTrace();
         }

     }

     @Override
     public void onClick(View v) {
         switch (v.getId()) {
         case R.id.btn1:
             bindService();
             break;
         case R.id.btn2:
             startService();
             break;

         default:
             break;
         }

     }

     @Override
     protected void onDestroy() {
         super.onDestroy();
         unbindService(sc);
         Intent it = new Intent(this, MyMessenger.class);
         stopService(it);

     }
 }

 package com.lixu.messenger;

 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.util.Log;

 public class MyMessenger extends Service {
     private int a;
     private int b;
     private Messenger mMessenger;

     @Override
     public void onCreate() {
         super.onCreate();
         Handler handler = new Handler() {
             @Override
             public void handleMessage(Message msg) {
                 super.handleMessage(msg);
                 if (msg.what == Changliang.WHAT) {
                     int[] nums = (int[]) msg.obj;
                     a = nums[0];
                     b = nums[1];
                 }
             }
         };
         mMessenger=new Messenger(handler);
     }

     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
         int numshe = a + b;
         Log.e("服务器收到结果：", numshe + "");
         return super.onStartCommand(intent, flags, startId);
     }

     @Override
     public boolean onUnbind(Intent intent) {
         return super.onUnbind(intent);
     }

     @Override
     public IBinder onBind(Intent arg0) {
         return mMessenger.getBinder();
     }

 }