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);
     }

 }