Messenger

package com.example.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 MyAppService extends Service{

private Messenger messenger = null;
private int a,b,result;

@Override
public void onCreate() {
Handler handler = new Handler(){

@Override
public void handleMessage(Message msg) {
Log.d("后台服务收到消息", msg.arg1+","+msg.arg2);
a=msg.arg1;
b=msg.arg2;
}
};
messenger = new Messenger(handler);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
result = a+b;
Log.d("计算结果", result+"");

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

@Override
public IBinder onBind(Intent intent) {

return messenger.getBinder();
}
}

package com.example.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.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements View.OnClickListener{

private ServiceConnection sc = null;
private Messenger sender;

private	int	seq=0;

private	int a=2,b=3;

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

Button bind = (Button) findViewById(R.id.bind);
bind.setOnClickListener((OnClickListener) this);

Button send = (Button) findViewById(R.id.send);
send.setOnClickListener((OnClickListener) this);

Button jisuan=(Button) findViewById(R.id.jisuan);
jisuan.setOnClickListener((OnClickListener) this);
}

private void bindMyService(){
sc= new ServiceConnection(){

@Override
public void onServiceConnected(ComponentName name, IBinder binder) {

sender = new Messenger(binder);
}

@Override
public void onServiceDisconnected(ComponentName name) {

}
};

Intent intent = new Intent(this,MainActivity.class);
bindService(intent, sc, Service.BIND_AUTO_CREATE);

}

private	void	startMyJiSuanService(){
Intent intent=new Intent(this,MyAppService.class);
startService(intent);
}

private void sendMessage(){
Message msg = new Message();
msg.arg1=a;
msg.arg2=b;

try {
sender.send(msg);
} catch (RemoteException e) {

e.printStackTrace();
}

}

@Override
protected void onDestroy() {

super.onDestroy();
this.unbindService(sc);
}

@Override
public void onClick(View v) {
switch (v.getId()) {

case R.id.bind:
bindMyService();
break;

case R.id.send:
sendMessage();
break;

case R.id.jisuan:
startMyJiSuanService();
}

}
}