android编写Service入门用法与教程

核心提示：package com.easymorse;import android.app.Activity;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;im

package com.easymorse;import android.app.Activity;import android.content.ComponentName;import android.content.Intent;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.util.Log;public class LocalServiceDemoActivity extends Activity { private ServiceConnection serviceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { countService = (ICountService) service; Log.v("CountService", "on serivce connected, count is " + countService.getCount()); } @Override public void onServiceDisconnected(ComponentName name) { countService = null; } }; private ICountService countService; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); this.bindService(new Intent("com.easymorse.CountService"), this.serviceConnection, BIND_AUTO_CREATE); } @Override protected void onDestroy() { super.onDestroy(); this.unbindService(serviceConnection); }}

编写传递基本型数据的远程服务

上面的示例，可以扩展为，让其他应用程序复用该服务。这样的服务叫远程(remote)服务，实际上是进程间通信(RPC)。

这时需要使用android接口描述语言(AIDL)来定义远程服务的接口，而不是上述那样简单的java接口。扩展名为aidl而不是java。可用上面的ICountService改动而成ICountSerivde.aidl，eclipse会自动生成相关的java文件。

package com.easymorse;interface ICountService { int getCount();}

编写服务(Service)类，稍有差别，主要在binder是通过远程获得的，需要通过桩(Stub)来获取。桩对象是远程对象的本地代理。

package com.easymorse;import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.os.RemoteException;import android.util.Log;public class CountService extends Service { private boolean threadDisable; private int count; private ICountService.Stub serviceBinder = new ICountService.Stub() { @Override public