用Volley-nullpointerexception

  public Request(int method, String url, Response.ErrorListener listener) {
         mMethod = method;
         mUrl = url;
         mErrorListener = listener;
         setRetryPolicy(new DefaultRetryPolicy());

         mDefaultTrafficStatsTag = TextUtils.isEmpty(url) ? 0: Uri.parse(url).getHost().hashCode();
    }

最后发现是没有加http://

http://stackoverflow.com/questions/18523961/android-maven-project-using-volley-nullpointerexception