Activity与Service数据交互：Binder、bindService的用法

package com.lixu.jiaohu;

import com.lixu.jiaohu.MyAppService.Mybind;

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.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {
    private ServiceConnection sc;
    private MyAppService mMyAppService;

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

        Button btn1 = (Button) findViewById(R.id.button1);
        Button btn2 = (Button) findViewById(R.id.button2);
        Button btn3 = (Button) findViewById(R.id.button3);

        btn1.setOnClickListener(this);
        btn2.setOnClickListener(this);
        btn3.setOnClickListener(this);
        // 建立service连接
        sc = new ServiceConnection() {

            @Override
            public void onServiceDisconnected(ComponentName name) {

            }

            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
                Mybind mMybind = (Mybind) service;
                mMyAppService = mMybind.getService();// 获取MyAppService的对象
            }
        };
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button1:
            startService();
            break;
        case R.id.button2:
            bindService();
            break;
        case R.id.button3:
            String str = mMyAppService.getServiceValue();
            Toast.makeText(this, str, 0).show();
            break;
        default:
            break;
        }

    }

    public void startService() {
        mMyAppService.setServiceValue("你是：");// 设置MyAppService里面的公共变量的值
        Intent intent = new Intent(this, MyAppService.class);
        startService(intent);
    }

    public void bindService() {
        Intent it = new Intent(this, MyAppService.class);
        bindService(it, sc, Service.BIND_AUTO_CREATE);// 建立service的bind连接
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Intent it = new Intent(this, MyAppService.class);
        stopService(it);// 关闭服务
    }

}

package com.lixu.jiaohu;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

public class MyAppService extends Service {
    private String str;

    @Override
    public void onCreate() {
        Log.e("MyAppService", "onCreate开始了");
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        str = str + "宝儿";
        return super.onStartCommand(intent, flags, startId);
    }

    // Activity bindService()方法开启后进入执行onBind方法
    @Override
    public IBinder onBind(Intent intent) {

        return new Mybind();
    }

    public String getServiceValue() {
        return str;
    }

    public void setServiceValue(String str) {
        this.str = str;
    }

    public class Mybind extends Binder {
        public MyAppService getService() {
            return MyAppService.this;

        }
    }

    @Override
    public boolean onUnbind(Intent intent) {
        // TODO Auto-generated method stub
        return super.onUnbind(intent);
    }

}