Volley Post 请求在 onResponse 内没有返回响应

Question

所以我想打印响应的结果，然后使用 gson 为模型生成数据，但是响应永远不会返回，还调用了 onResponse。！

如果您注意到 Logcat，onResponse 中的 log.i 没有显示..！？但是在使用这个请求的Activity的onSuccess里面，它正常显示日志，但是如果日志包含响应对象，它不会显示很奇怪，没有任何意义..！？

Logcat

I/getUrl:: http://1925.232.55/login.php
I/getParams:: {username =samy, password=123456}
D/libc: [NET] android_getaddrinfofornetcontext+,hn 20(0x6),sn(),hints(known),family 0,flags 1024, proc=com...
D/libc: [NET] android_getaddrinfo_proxy get netid:0
D/libc: [NET] android_getaddrinfo_proxy-, success
I/onSuccess:: check /* this log inside the Activity which uses this request */

我尝试使用具有相同 url 和参数的 PostMan 测试请求 它正常返回json响应..？

邮递员回复

{
    "status": "success",
    "user_id": "10",
    "user_name": "samy",
    "full_name": "samy samy",
    "picture": "st_pictures/IMG_085207.jpg",
    "level": "1",
    "school": "NY School",
    "city": "NY",
    "class": "6",
    "age": "22",
    "teacher": "2",
    "token": "f808e758sdfsdfsf162dbdfcf88e3dc8a96"
}

请求代码

 final RequestQueue queue = Volley.newRequestQueue(context);

      final StringRequest sr = new StringRequest(Request.Method.POST, getLoginURL(), new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
          Log.i("onResponse: ", response + "");
      requestResult.onSuccess(response);


      }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
      requestResult.onFail(error);

           VolleyLog.e("Error: ", error.getMessage());
          error.printStackTrace();
        }
      })
      {
        @Override
        protected Map<String, String> getParams() {
          Map<String, String> params = new HashMap<String, String>();
          params.put("username ", un);
          params.put("password", pass);
          Log.i( "getParams: ", params.toString());
          return params;
        }

        @Override
        public byte[] getBody() throws AuthFailureError {
          Log.i( "getUrl: ",getUrl());
          return super.getBody();

        }
      }
      ;

      queue.add(sr);

更新 #1

网址http://clients.intertech.ps/raz/std.php

 E/Volley: [1] 2.onErrorResponse: Error: 
 W/System.err: com.android.volley.ParseError: org.json.JSONException: End of input at character 0 of 
 W/System.err:     at com.android.volley.toolbox.JsonObjectRequest.parseNetworkResponse(JsonObjectRequest.java:73)
 W/System.err:     at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:123)
 W/System.err: Caused by: org.json.JSONException: End of input at character 0 of 
 W/System.err:     at org.json.JSONTokener.syntaxError(JSONTokener.java:449)
 W/System.err:     at org.json.JSONTokener.nextValue(JSONTokener.java:97)
 W/System.err:     at org.json.JSONObject.<init>(JSONObject.java:156)
 W/System.err:     at org.json.JSONObject.<init>(JSONObject.java:173)
W/System.err:     at com.android.volley.toolbox.JsonObjectRequest.parseNetworkResponse(JsonObjectRequest.java:68)
 W/System.err:  ... 1 more

Answer 1

很久以前有人问过这个问题，但我也遇到了同样的问题，几个小时后我才用 Volley 解决了这个问题

使用 StringRequest 而不是 JsonObjectRequest，出于任何原因，我在 JOR 上遇到了很多问题，我使用了 @Oussema Aroua 的 getHeaders 函数

final Response.Listener<String> responseListener = new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            Log.d("RESPONSE", String.valueOf(response));
        }
    };

final Response.ErrorListener errorListener = new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {

            //Handle your errors
        }
    };

StringRequest request = new StringRequest(Request.Method.POST, url,
            responseListener, errorListener) {
        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<>();
            //Put your params for post
            return params;
        }

        @Override
        public Map<String, String> getHeaders() {
            Map<String,String> params = new HashMap<>();
            params.put("Content-Type","application/x-www-form-urlencoded"); //-> this is the key
            return params;
        }
    };

.. 你会在onResponse中得到来自服务器的json响应

Answer 2

你必须使用JsonObjectRequest，像这样：

HashMap<String, String> params = new HashMap<String, String>();
params.put("username","samy");
params.put("password","123456");

JsonObjectRequest req = new JsonObjectRequest(URL, new JSONObject(params),
 new Response.Listener<JSONObject>() {
       @Override
       public void onResponse(JSONObject response) {
           Gson gson = new Gson();
           YourClass yourClass = gson.fromJson(response.toString(), yourClass.class);
       }
   }, new Response.ErrorListener() {
       @Override
       public void onErrorResponse(VolleyError error) {
            //error
       }
   });

Answer 3

这不是StringRequest，您需要使用JsonObjectRequest，因为您的回复以{开头

JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET,
                url, null,
                new Response.Listener<JSONObject>() {

                    @Override
                    public void onResponse(JSONObject response) {
                        Log.d(TAG, response.toString());
                       requestResult.onSuccess(response);
                    }
                }, new Response.ErrorListener() {

                    @Override
                    public void onErrorResponse(VolleyError error) {
                        VolleyLog.d(TAG, "Error: " + error.getMessage());
                        requestResult.onFail(error);
                    }
                });

尝试在getParams下添加：

@Override
public Map<String, String> getHeaders() throws AuthFailureError {
    Map<String,String> params = new HashMap<String, String>();
    params.put("Content-Type","application/x-www-form-urlencoded");
    return params;
}

[更新]：

我不知道为什么 volley 不起作用，但我更改为 ion link 并且它起作用了：

Ion.with(this)
                .load("http://clients.intertech.ps/raz/std.php")
                .setBodyParameter("username", "layal")
                .setBodyParameter("password", "123456")
                .asJsonObject()
                .setCallback(new FutureCallback<JsonObject>() {
                    @Override
                    public void onCompleted(Exception e, JsonObject jsonObject) {
                        Log.e("TAG", "onCompleted: " + jsonObject.toString());
                    }
                });