Android服务监控

上次我写过一个关于Android服务检测的，结果那段代码是错误的，根本不能实现，我现在重新发一段正确的。
这次我把检测写成一个服务（Service），使用时在Activity里面调用就行了。

import android.app.Service;

import android.content.Context;

import android.content.Intent;

import android.os.IBinder;

import android.telephony.PhoneStateListener;

import android.telephony.ServiceState;

import android.telephony.TelephonyManager;



public class GsmStateService extends Service {

	

	exPhoneStateListener psl=new exPhoneStateListener();

	

	private int ib_state;

	

	@Override

	public void onCreate()

	{

		//取得电话服务

		TelephonyManager tm=(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);

		//注册listener

		tm.listen(psl, PhoneStateListener.LISTEN_SERVICE_STATE);

		System.out.println("test");

	}

	@Override

	public IBinder onBind(Intent arg0) {

		// TODO Auto-generated method stub

		return null;

	}

	

	public class exPhoneStateListener extends PhoneStateListener

    {	

    	public void onServiceStateChanged(ServiceState ss)

    	{

    		super.onServiceStateChanged(ss);

    		int state;

    		state=ss.getState();

    		

    		switch(state)

            {

            case ServiceState.STATE_IN_SERVICE:

            	ib_state=1;

            	break;

            case ServiceState.STATE_OUT_OF_SERVICE:

            	ib_state=0;

            	break;

            }

    		Intent i=new Intent("SERVICE_STATE");

    		i.putExtra("STATE", ib_state);

    		sendBroadcast(i);

    	}

    }



}