Android BindService

   一般情况下我们使用startService(Intent service)来启动一个服务，但这种情况下无法得到Service对象的引用，通过bindService方法启动服务则可以实现此功能。下面给一个小例子演示一下：

 

1.调用者

 

package com.zhf.local;


import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;

/**
 * 此例的目的就是拿到MyService的引用，从而可以引用其内部的方法和变量
 * @author Administrator
 *
 */
public class LocalServiceActivity extends Activity {
    /** Called when the activity is first created. */
    private MyService myService;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Intent intent = new Intent(this, MyService.class);
        bindService(intent, connection, Context.BIND_AUTO_CREATE);
    }

    private ServiceConnection connection = new ServiceConnection() {

        @Override
        public void onServiceDisconnected(ComponentName name) {
            myService = null;
        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            myService = ((MyService.MyBinder) service).getService();
            System.out.println("Service连接成功");
            //执行Service内部自己的方法
            myService.excute();
        }
    };

    protected void onDestroy() {
        super.onDestroy();
        unbindService(connection);
    };
}

 

 

2.服务者

 

package com.zhf.local;

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

public class MyService extends Service {
    private final IBinder binder=new MyBinder();
    @Override
    public IBinder onBind(Intent intent) {
        return binder;
    }

    public class MyBinder extends Binder{
        MyService getService(){
            return MyService.this;
        }
    }

    public void excute(){
        System.out.println("通过Binder得到Service的引用来调用Service内部的方法");
    }

    @Override
    public void onDestroy() {
        //当调用者退出(即使没有调用unbindService)或者主动停止服务时会调用
        super.onDestroy();
    }

    @Override
    public boolean onUnbind(Intent intent) {
        //当调用者退出(即使没有调用unbindService)或者主动停止服务时会调用
        System.out.println("调用者退出了");
        return super.onUnbind(intent);
    }
}