Android監聽網路連接狀態變化

else if(action.equals(ConnectivityManager.CONNECTIVITY_ACTION)){            System.out.println("network status changed!!!");                    // TODO Auto-generated method stub        NetworkInfo mobNetInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);        NetworkInfo wifiNetInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);                if(!mobNetInfo.isConnected() && !wifiNetInfo.isConnected()         && mpreference.getBoolean(mresources.getString(R.string.key_gprs_swith), false)        ){        //connect our network        beginConnectGprs();                }