求助各位大大，如何保存volley包里onresponse方法的返回值

    代码如下：
    Volley.newRequestQueue(getApplication());
  RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
    final HashMap<String,String> map = new HashMap<String,String>();
    Request js = new StringRequest(Request.Method.POST, 
            "http://demo.giantming.net/signup.php", new Listener<String>() {

                @Override
                public void onResponse(final String response) {
                    // TODO Auto-generated method stub
                    new Thread(new Runnable() {
                        public void run() {
                            map.put("res", response);
                        }
                    })
                    .start();           
                }
    }, new Response.ErrorListener()
    {
        @Override
        public void onErrorResponse(VolleyError error) {
        }
    }) {
        @Override
        protected HashMap<String, String> getParams() {

            HashMap<String, String> hp= new HashMap<String, String>();                      
            hp.put("stuid", siid);
            hp.put("username", uname);
            hp.put("password", password);
            hp.put("college", simajor);
            return hp;
        }
    };        
    requestQueue.add(js);
    Log.e("tag", map.get("res")+"");
}
好像在这个方法里除了Log之外都不能对这个返回值（即response）进行操作 放进map也不行 只能保存一个空值 用if判断也不行

http://blog.csdn.net/findsafety/article/details/43196281