Android-Activity与服务Service绑定

public class MusicActivity extends Activity implements OnClickListener{  
    @Override  
    public void onClick(View v) {connection(); }  
    private void connection() {  
            Intent intent = new Intent("david.bindService");  
            bindService(intent, sc, Context.BIND_AUTO_CREATE);  
    }  
    //在客户端覆写onServiceConnected方法,当服务绑定成功会调用此回调函数  
    private ServiceConnection sc = new ServiceConnection() {  
            @Override  
            public void onServiceConnected(ComponentName name, IBinder service) {  
                MyBinder binder = (MyBinder)service; //通过IBinder获取Service  
                musicService = binder.getService();  
                if(musicService != null){ musicService.play(); }  
            }  
        };  
    }  
}  

public class MusicService extends Service {  
    //需用内部类继承Binder,并定义方法获取Service对象  
    private final IBinder binder = new MyBinder();  
    public class MyBinder extends Binder {  
        BindMusicService getService() {  
            return BindMusicService.this;  
        }  
    }  
    @Override  
    public IBinder onBind(Intent intent) {//当客户端调用bindService()方法时调用此函数  
        return binder;  
    }  
    @Override  
    public void onCreate() { }  
    @Override  
    public void onDestroy() { }  
}  

package com.app.myservice;  
  
import com.app.myservice.service.MyService;  
import com.app.myservice.service.MyService.MyBind;  
  
import android.os.Bundle;  
import android.os.IBinder;  
import android.app.Activity;  
import android.content.ComponentName;  
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.Toast;  
  
public class ServiceDemo03_Bind extends Activity implements OnClickListener{  
    private Button startservice,stopservice,binderservice,unbinderservice,getService;  
    private boolean mIsBound;  
      
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_first);  
          
        startservice = (Button) findViewById(R.id.button1);  
        stopservice = (Button) findViewById(R.id.button2);  
        binderservice = (Button) findViewById(R.id.button3);  
        unbinderservice = (Button) findViewById(R.id.button4);  
        getService = (Button) findViewById(R.id.button5);  
          
        startservice.setOnClickListener(this);  
        stopservice.setOnClickListener(this);  
        binderservice.setOnClickListener(this);  
        unbinderservice.setOnClickListener(this);  
        getService.setOnClickListener(this);  
    }  
  
    @Override  
    public void onClick(View v) {  
        // TODO Auto-generated method stub  
        Intent intent = new Intent(ServiceDemo03_Bind.this,MyService.class);  
        switch (v.getId()) {  
        case R.id.button1:  
            startService(intent);  
            break;  
        case R.id.button2:  
            stopService(intent);  
            break;  
        case R.id.button3:  
            //绑定Service  
            //BIND_AUTO_CREATE表示自动创建  
            bindService(intent, connection, BIND_AUTO_CREATE);  
            mIsBound = true;  
            break;  
        case R.id.button4:  
            //解除绑定Service  
            if (mIsBound == true) {  
                unbindService(connection);  
            }  
            mIsBound = false;  
            break;  
        case R.id.button5:  
            //提示框  
            Toast.makeText(ServiceDemo03_Bind.this, "当前Service的值为"+mService.getIndex(), 1000).show();  
            break;  
        default:  
            break;  
        }  
    }  
   
    private MyService mService = new MyService();  
    ServiceConnection connection = new ServiceConnection() {  
        @Override  
        public void onServiceDisconnected(ComponentName name) {  
            // TODO Auto-generated method stub  
            Toast.makeText(ServiceDemo03_Bind.this, "这里是：onServiceDisconnected", 1000).show();  
        }  
        @Override  
        public void onServiceConnected(ComponentName name, IBinder service) {  
            // TODO Auto-generated method stub  
            Toast.makeText(ServiceDemo03_Bind.this, "这里是：onServiceConnected", 1000).show();  
            System.out.println("onServiceConnected");  
            MyService.MyBind myBind = (MyBind) service;  
            mService = myBind.getMyService();  
        }  
    };  
}  

package com.app.myservice.service;  
  
import java.util.Timer;  
import java.util.TimerTask;  
  
import android.R.integer;  
import android.app.Service;  
import android.content.Context;  
import android.content.Intent;  
import android.os.Binder;  
import android.os.IBinder;  
import android.widget.Toast;  
  
public class MyService extends Service{  
    private Timer timer;  
    private TimerTask task;  
    private int index=0;  
    Context context;  
    @Override  
    public IBinder onBind(Intent intent) {  
        // TODO Auto-generated method stub  
        return mBind;  
    }  
    private MyBind mBind = new MyBind();  
    public class MyBind extends Binder {  
        public MyService getMyService() {  
            return MyService.this;  
        }  
    }                                                  
    @Override  
    public void onCreate() {  
        // TODO Auto-generated method stub  
        super.onCreate();  
        context = getApplicationContext();  
        Toast.makeText(context, "这里是：onCreate", 1000).show();  
        System.out.println("onCreate");  
    }  
    @Override  
    public int onStartCommand(Intent intent, int flags, int startId) {  
        // TODO Auto-generated method stub  
        System.out.println("onStartCommand");  
        Toast.makeText(context, "这里是：onStartCommand", 1000).show();  
        startTimer();  
        return super.onStartCommand(intent, flags, startId);  
    }  
    @Override  
    public void onDestroy() {  
        // TODO Auto-generated method stub  
        System.out.println("onDestroy");  
        Toast.makeText(context, "这里是：onDestroy", 1000).show();  
        super.onDestroy();  
        stopTimer();  
    }  
      
    public void startTimer() {  
        timer = new Timer();  
        task = new TimerTask() {  
            @Override  
            public void run() {  
                // TODO Auto-generated method stub  
                index++;  
                System.out.println(index);  
            }  
        };  
        // 安排指定的任务从指定的延迟后开始进行重复的固定延迟执行  
        timer.schedule(task, 1000, 1000);  
    }  
    public void stopTimer() {  
        timer.cancel();//取消此计时器任务  
    }  
    public int getIndex() {  
        return index;  
    }  
}  

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    android:paddingBottom="@dimen/activity_vertical_margin"  
    android:padding
补充：移动开发 , Android ,