Android 安卓截击给我400个错误代码（错误请求）

我正试图使用

Volley

向我的应用程序发出POST请求，但它显示

E/Volley﹕ [9988] BasicNetwork.performRequest: Unexpected response code 400 for http://test_url/SendMessage

但它在《邮递员》中运行良好

邮差快照：

public JSONObject getJsonObject() {
        Map<String, Object> postParam = new HashMap<>();
        postParam.put("Recipients", new String[]{authorId + ":I"});
        postParam.put("Subject", etSubject.getText().toString());
        postParam.put("Text", etMessage.getText().toString());
        postParam.put("MessageState", "N");
        postParam.put("ParentId", "");
        postParam.put("PrivateMessageGuid", GUID);
        Log.i("JSON Parameter ===", Utils.getRequestJSONObject(postParam).toString());
        return Utils.getRequestJSONObject(postParam);
    }

JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.POST,
            Constants.ReplyMessageUrl, getJsonObject(),
            new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    Toast.makeText(getApplicationContext(),
                            "Message Send", Toast.LENGTH_SHORT).show();

                }
            }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(getApplicationContext(),
                    getResources().getString(R.string.try_again), Toast.LENGTH_SHORT).show();
        }
    }) {
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            HashMap<String, String> headers = new HashMap<>();
            headers.put("Authorization", mApp.getTokenType() + " " + mApp.getAccessToken());
            headers.put("Content-Type", "application/json");
            headers.put("Accept", "application/json");
            return headers;
        }
    };

    RequestQueue mRequestQueue = mApp.getRequestQueue();
    mRequestQueue.add(jsonReq);

这是我的代码：

public JSONObject getJsonObject() {
        Map<String, Object> postParam = new HashMap<>();
        postParam.put("Recipients", new String[]{authorId + ":I"});
        postParam.put("Subject", etSubject.getText().toString());
        postParam.put("Text", etMessage.getText().toString());
        postParam.put("MessageState", "N");
        postParam.put("ParentId", "");
        postParam.put("PrivateMessageGuid", GUID);
        Log.i("JSON Parameter ===", Utils.getRequestJSONObject(postParam).toString());
        return Utils.getRequestJSONObject(postParam);
    }

JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.POST,
            Constants.ReplyMessageUrl, getJsonObject(),
            new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    Toast.makeText(getApplicationContext(),
                            "Message Send", Toast.LENGTH_SHORT).show();

                }
            }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(getApplicationContext(),
                    getResources().getString(R.string.try_again), Toast.LENGTH_SHORT).show();
        }
    }) {
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            HashMap<String, String> headers = new HashMap<>();
            headers.put("Authorization", mApp.getTokenType() + " " + mApp.getAccessToken());
            headers.put("Content-Type", "application/json");
            headers.put("Accept", "application/json");
            return headers;
        }
    };

    RequestQueue mRequestQueue = mApp.getRequestQueue();
    mRequestQueue.add(jsonReq);

---

请帮我找到解决办法。谢谢。

安装wireshark并比较其中的两个请求，以查看实时流量的差异。+最好使用GSON，并根据getJsonObject（）中的内容完成类。

似乎是@random的重复question@Viks你有什么办法吗？我也有同样的办法