绑定service进行通信

package com.example.service_senddata;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;

public class MyService extends Service {
    private String data = "这是默认信息";
    private boolean flag = false;

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        //返回新建的类
        return new Obinder();
    }
    //这个类用来继承系统下的binder类，
    public class Obinder extends android.os.Binder {
        //这个类下面的设置数据的方法
        void setData(String data) {
            MyService.this.data = data;
        }
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub
        Bundle b = intent.getExtras();
        data = b.getString("msg");
        return super.onStartCommand(intent, flags, startId);
    }
    

    @Override
    public void onCreate() {
        super.onCreate();
        flag = true;

        new Thread() {
            public void run() {
                while (flag) {
                    System.out.println("Service中获取到的数据：" + data);
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            };
        }.start();
    };

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        flag = false;
    }

}

package com.example.service_senddata;

import android.os.Bundle;
import android.os.IBinder;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity implements OnClickListener, ServiceConnection{
    private Button btn_startservice;
    private Button btn_stopservice;
    private EditText edt_data;
    //声明service的内部类
    private MyService.Obinder binder = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_startservice = (Button) findViewById(R.id.btn_startservice);
        btn_stopservice = (Button) findViewById(R.id.btn_stopservice);
        edt_data = (EditText) findViewById(R.id.edt_data);
        btn_startservice.setOnClickListener(this);
        btn_stopservice.setOnClickListener(this);
        findViewById(R.id.btn_bindservice).setOnClickListener(this);
        findViewById(R.id.btn_unbindservice).setOnClickListener(this);
        findViewById(R.id.btn_sycservice).setOnClickListener(this);
    
    }
    @Override
    public void onClick(View v) {
        
        switch (v.getId()) {
        case R.id.btn_startservice:
            Intent i = new Intent(this,MyService.class);
            i.putExtra("msg", edt_data.getText().toString());
            startService(i);
            break;
        case R.id.btn_stopservice:
            stopService(new Intent(this,MyService.class));
            break;
        case R.id.btn_bindservice:
            bindService(new Intent(this,MyService.class), this, Context.BIND_AUTO_CREATE);
            break;
        case R.id.btn_unbindservice:
            unbindService(this);
            break;
        case R.id.btn_sycservice:
            if(binder!=null){
                //调用内部类里的方法
                binder.setData(edt_data.getText().toString());
            }
            break;

        }
    }
    @Override
    public void onServiceConnected(ComponentName arg0, IBinder service) {
        // 这里的binder对象可以访问到myservice下onBind（）方法的返回值
        //进行初始化
        binder = (com.example.service_senddata.MyService.Obinder) service;
    }
    @Override
    public void onServiceDisconnected(ComponentName arg0) {
        // TODO Auto-generated method stub
        
    }

    
}