以JSONObject为参数的Volley JSONArrayRequest [英] Volley JSONArrayRequest with JSONObject as parameter
本文介绍了以JSONObject为参数的Volley JSONArrayRequest的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要使用JSONObject进行请求,如下所示:
I need to make a request with a JSONObject as follows:
{
'LangIDs': [1, 2],
'GenreIDs': [4],
'LowPrice': 0,
'HighPrice': 999,
'SearchTerms': [],
'Pagination': {
'PageNumber': 0,
'PageLength': 10
}
}
期望的响应是一个JSONArray.使用 Volley ,我无法使用JSONObject参数创建JsonArrayRequest.
The expected response is a JSONArray. Using Volley, I can't make a JsonArrayRequest with a JSONObject parameter.
在我以这种方式发出请求之前:
Before I made the request this way:
StringRequest jsonObjectRequest = new StringRequest(Request.Method.POST, url, new Response.Listener < String > () {
@Override
public void onResponse(String response) {
JSONObject jsonObject;
int id;
String bookName;
String Url;
try {
responseArray = new JSONArray(response);
} catch (JSONException e) {
}
for (int i = 0; i < response.length(); i++) {
try {
jsonObject = responseArray.getJSONObject(i);
id = jsonObject.getInt(Constants.KEY_ID);
bookName = jsonObject.getString(Constants.KEY_BOOKNAME);
Url = imgUrl + jsonObject.getString(Constants.KEY_IMG_URL);
books.add(new Book(id, bookName, Url));
} catch (JSONException e) {
e.printStackTrace();
}
}
mAdapter.updateGrid(books);
Log.v("Response", response);
}
}, new Response.ErrorListener() {@
Override
public void onErrorResponse(VolleyError error) {
Log.e("Error:", error.getMessage());
}
}) {@
Override
protected Map < String, String > getParams() throws AuthFailureError {
HashMap < String, String > params = new HashMap < > ();
String message = getArguments().getString(Constants.KEY_FILTER_VALUES);
Log.v("FilterMessage", message);
params.put(Constants.KEY_PAGENUMBER, String.valueOf(0));
params.put(Constants.KEY_PAGELENGTH, String.valueOf(10));
return params;
}
};
但是现在是包含JSONObject的JSONObject.
But now it is JSONObject that contains JSONObject.
现在如何使用Volley发出此请求?
How now I can make this request using Volley?
推荐答案
我创建了一个自定义的凌空请求,该请求接受JSONObject作为参数.
I created a custom volley request that accepts a JSONObject as parameter.
CustomJsonArrayRequest.java
public class CustomJsonArrayRequest extends JsonRequest<JSONArray> {
/**
* 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 CustomJsonArrayRequest(int method, String url, JSONObject jsonRequest,
Listener<JSONArray> listener, ErrorListener errorListener) {
super(method, url, (jsonRequest == null) ? null : jsonRequest.toString(), listener,
errorListener);
}
@Override
protected Response<JSONArray> parseNetworkResponse(NetworkResponse response) {
try {
String jsonString = new String(response.data,
HttpHeaderParser.parseCharset(response.headers, PROTOCOL_CHARSET));
return Response.success(new JSONArray(jsonString),
HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
} catch (JSONException je) {
return Response.error(new ParseError(je));
}
}
}
如何使用?
JSONObject body = new JSONObject();
// Your code, e.g. body.put(key, value);
CustomJsonArrayRequest req = new CustomJsonArrayRequest(Request.Method.POST, url, body, success, error);
这篇关于以JSONObject为参数的Volley JSONArrayRequest的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文