Android Volley POST发送参数始终为空

Question

我是Android的新手，现在我在做一个应用，这个应用我需要把数据发送到服务器上，现在我用的是Volley post方法，但是当我用Volley发送数据到服务器上的时候，参数总是显示为空，这里我附上了代码，请检查一下，这里我用的是片段。

String url = "http://192.168.1.182:8084/name/registration.jsp";

    final ProgressDialog pDialog = new ProgressDialog(this.getActivity());
    pDialog.setMessage("Loading...");
    pDialog.show();    
    RequestQueue rq = Volley.newRequestQueue(getActivity().getApplicationContext());
    JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST,
            url, null,
            new Response.Listener<JSONObject>() {

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

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

        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<String, String>();
            params.put("name", "Ajay K K");
            params.put("mailid", "[e-mail]");
            params.put("phone", "8086327023");
            params.put("place", "Calicut");
            params.put("longitude","44444.3333");
            params.put("latitude","666666.3333");
            params.put("wheel", "1");
            params.put("type", "owner");

            return params;
        }

    };

    // Adding request to request queue
    rq.add(jsonObjReq);

Answer 1

不要重写getParams()。JSONObjectRequest使用构造函数中的第三个参数获取post参数。下面是Volley代码中包含的文档

/**
 * Creates a new request.
 * @param method the HTTP method to use
 * @param url URL to fetch the JSON from
 * @param jsonRequest A {@link JSONObject} to post with the request. Null is allowed and
 *   indicates no parameters will be posted along with request.
 * @param listener Listener to receive the JSON response
 * @param errorListener Error listener, or null to ignore errors.
 */
public JsonObjectRequest(int method, String url, JSONObject jsonRequest,
        Listener<JSONObject> listener, ErrorListener errorListener) {
    super(method, url, (jsonRequest == null) ? null : jsonRequest.toString(), listener,
                errorListener);
}

像这样使用。

String url = "http://192.168.1.182:8084/name/registration.jsp";

final ProgressDialog pDialog = new ProgressDialog(this.getActivity());
pDialog.setMessage("Loading...");
pDialog.show();    
RequestQueue rq = Volley.newRequestQueue(getActivity().getApplicationContext());

JSONObject params = new JSONObject();
try {
    params.put("name", "Ajay K K");
    params.put("mailid", "[e-mail]");
    params.put("phone", "8086327023");
    params.put("place", "Calicut");
    params.put("longitude","44444.3333");
    params.put("latitude","666666.3333");
    params.put("wheel", "1");
    params.put("type", "owner");
} catch (JSONException e) {
    e.printStackTrace();
}

JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST,
        url, params, //Not null.
        new Response.Listener<JSONObject>() {

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

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

// Adding request to request queue
rq.add(jsonObjReq);