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。

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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);
        }
    }
 
}