android - 使用 Volley 发送带有 JSON 数据的 POST 请求

Question

我想发送一个新的 JsonObjectRequest 请求:

• 我想接收 JSON 数据(来自服务器的响应):好的

• 我想用这个请求发送 JSON 格式的数据到服务器

  JsonObjectRequest request = new JsonObjectRequest(
      Request.Method.POST, "myurl.com", null,
      new Response.Listener<JSONObject>() {
          @Override
          public void onResponse(JSONObject response) {
              //...
          }
      },
      new Response.ErrorListener() {
          @Override
          public void onErrorResponse(VolleyError error) {
              //...
          }
      })
      {
          @Override
          protected Map<String,String> getParams() {
              // something to do here ??
              return params;
          }
  
          @Override
          public Map<String, String> getHeaders() throws AuthFailureError {
              // something to do here ??
              return params;
          }
      };
  

附:我也在我的项目中使用 GSON 库。

Answer 1

JsonObjectRequest 实际上接受 JSONObject 作为正文。

来自 this blog article ,

final String url = "some/url";
final JSONObject jsonBody = new JSONObject("{\"type\":\"example\"}");

new JsonObjectRequest(url, jsonBody, new Response.Listener<JSONObject>() { ... });

这里是 source code and JavaDoc (@param jsonRequest):

/**
 * 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);
}