判断网络

public  static int getwang(Context ct){

    int netxt=-1;

    ConnectivityManager service = (ConnectivityManager) ct.getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo networkInfo = service.getActiveNetworkInfo();

 if (networkInfo==null){
     return netxt;
 }
    int type = networkInfo.getType();

    if (type==ConnectivityManager.TYPE_MOBILE){

        netxt = 2;

    }else if (type==ConnectivityManager.TYPE_WIFI){
        netxt=1;
    }

    return netxt;
}