android - Volley Post JsonObjectRequest 在使用 getHeader 和 getParams 时忽略参数

Question

我正在尝试连接 API url="api address"，它接受两种 header 类型 application/json 以 json 格式响应，application/xml 以 xml 格式响应。我需要使用 json 参数访问 JSON，响应也将采用 json 格式。使用带有 JsonObjectRequest 的 android volley Post 请求使用 getHeaders 设置 header ，它连接到服务器但 getParams 设置参数不起作用。

RequestQueue queue = Volley.newRequestQueue(this);
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST,
            Constants.BASE_URL + Constants.LOGIN, null, response,
            response_error) {
        /**
         * Passing some request headers
         * */
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            HashMap<String, String> headers = new HashMap<String, String>();
            headers.put("Content-Type", "application/json");
            return headers;
        }
         @Override
         protected Map<String, String> getPostParams()
         throws AuthFailureError {
         // TODO Auto-generated method stub
            Map<String, String> params = new HashMap<String, String>();
            params.put("key", "value");
            return params;
         }
    };
    // implementation of listeners
    Response.Listener<JSONObject> response = new Response.Listener<JSONObject>() {

        @Override
        public void onResponse(JSONObject response) {
            Log.d(TAG, response.toString());
            Log.e("responce", response.toString());

            // msgResponse.setText(response.toString());
            hideProgressDialog();
        }
    };
    Response.ErrorListener response_error = new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            Log.e("error responce", error.getMessage());
            VolleyLog.d(TAG, "Error: " + error.getMessage());
            hideProgressDialog();
        }
    };
//get params never get called
//i also tried alternative to send params but does not works.
        Map<String, String> params = new HashMap<String, String>();
            params.put("key", "value");
        JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST,
            Constants.BASE_URL + Constants.LOGIN, new JSONObject(params), response,
            response_error) {
        /**
         * Passing some request headers
         * */
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            HashMap<String, String> headers = new HashMap<String, String>();
            headers.put("Content-Type", "application/json");
            return headers;
        }
};

    any type of help will be appretiated, Thanks in advance.

Answer 1

Volley会忽略你的Content-Type设置，如果你想修改content-type，你可以覆盖getBodyContentType方法:

JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST, url,
        new JSONObject(params), response, response_error) {
    @Override
    public String getBodyContentType() {
        return "application/json; charset=utf-8";
    }
}

为什么 Volley 忽略你的参数？看看我的另一个answer .