关于安卓开发的问题

IntentService.java

public class Intentservice1 extends IntentService {

private String count;
private mybinder bind=new mybinder();
public class mybinder extends Binder
{
    public String getcount()
    {
        System.out.println(count);
        return count;
    }
}

public Intentservice1()
{
    super("Intentservice1");
    System.out.println("构造方法");
}

@Override
public void onCreate()
{
    super.onCreate();
    System.out.println("onCreate方法");
}

@Override
public IBinder onBind(Intent intenr)
{
    System.out.println("service isbind");
    return bind;
}

@Override
protected void onHandleIntent(Intent arg0) {
    // TODO Auto-generated method stub

}


}

MainActivity.java

private Intentservice1.mybinder binder1;
 private ServiceConnection conn=new ServiceConnection()
 {
 @Override
 public void onServiceConnected(ComponentName name,IBinder service)
 {
 System.out.println("service is connect");
 binder1=(Intentservice1.mybinder)service;
 System.out.println(binder1.getcount()); //这里发生了NullPointerException
    }

在运行的时候发生NullPointerException，请问为什么binder1.getcount()会发生这样的错误？binder1不是已经获得返回的Intentservice1.mybinder的值了吗？这里应该如何去改？