帖子JSON对象的数据在Android中使用凌空得到JSON数组响应 [英] Post Json object data to get Json array response using volley in android

问题描述

我要发布的JSONObject （使用排球）到网络服务，这是在返回的响应 JSONArray 格式。

I need to post JSONObject (using Volley) to a web-service which is returning the response in JSONArray format.

下面是我试过至今。

final JSONObject requestJsonObject = new JSONObject();
requestJsonObject.put("username", userName);
requestJsonObject.put("password", password);

JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.POST, ServiceUrls.LOGIN_URL, requestJsonObject, loginResponseListener, loginErrorListener);


private Listener<JSONObject> loginResponseListener = new Listener<JSONObject>() {
    @Override
    public void onResponse(JSONObject resposne) {
         //other stuff goes here
    }
};

但我发现了 JSONException 说 JSONArray 无法转换为的JSONObject 。有没有办法让 JSONArray 格式的反应呢？什么是我的问题的最佳解决方案？我如何发送的JSONObject 如果我使用 StringRequest 而不是 JsonObjectRequest ？请指引我

But I'm getting JSONException saying that JSONArray cannot be converted to JSONObject. Is there a way to get the response in JSONArray format? What is the best possible solution for my problem? How can I send JSONObject if I use StringRequest instead of JsonObjectRequest? Please guide me

推荐答案

下面的辅助类已固定我的问题

Below helper class has fixed my problem

public class CustomRequest extends JsonRequest<JSONArray> {

protected static final String PROTOCOL_CHARSET = "utf-8";
/**
 * Creates a new request.
 * @param method the HTTP method to use
 * @param url URL to fetch the JSON from
 * @param requestBody A {@link String} 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 CustomRequest(int method, String url, String requestBody, Listener<JSONArray> listener, ErrorListener errorListener) {
    super(method, url, requestBody, listener, errorListener);
}

/**
 * Creates a new request.
 * @param url URL to fetch the JSON from
 * @param listener Listener to receive the JSON response
 * @param errorListener Error listener, or null to ignore errors.
 */
public CustomRequest(String url, Listener<JSONArray> listener, ErrorListener errorListener) {
    super(Method.GET, url, null, listener, errorListener);
}

/**
 * Creates a new request.
 * @param method the HTTP method to use
 * @param url URL to fetch the JSON from
 * @param listener Listener to receive the JSON response
 * @param errorListener Error listener, or null to ignore errors.
 */
public CustomRequest(int method, String url, Listener<JSONArray> listener, ErrorListener errorListener) {
    super(method, url, null, listener, errorListener);
}

/**
 * Creates a new request.
 * @param method the HTTP method to use
 * @param url URL to fetch the JSON from
 * @param jsonRequest A {@link JSONArray} 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 CustomRequest(int method, String url, JSONArray jsonRequest, Listener<JSONArray> listener, ErrorListener errorListener) {
    super(method, url, (jsonRequest == null) ? null : jsonRequest.toString(), listener, errorListener);
}

/**
 * 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 CustomRequest(int method, String url, JSONObject jsonRequest, Listener<JSONArray> listener, ErrorListener errorListener) {
    super(method, url, (jsonRequest == null) ? null : jsonRequest.toString(), listener, errorListener);
}

/**
 * Constructor which defaults to <code>GET</code> if <code>jsonRequest</code> is
 * <code>null</code>, <code>POST</code> otherwise.
 *
 * @see #MyjsonPostRequest(int, String, JSONArray, Listener, ErrorListener)
 */
public CustomRequest(String url, JSONArray jsonRequest, Listener<JSONArray> listener, ErrorListener errorListener) {
    this(jsonRequest == null ? Method.GET : Method.POST, url, jsonRequest, listener, errorListener);
}

/**
 * Constructor which defaults to <code>GET</code> if <code>jsonRequest</code> is
 * <code>null</code>, <code>POST</code> otherwise.
 *
 * @see #MyjsonPostRequest(int, String, JSONObject, Listener, ErrorListener)
 */
public CustomRequest(String url, JSONObject jsonRequest, Listener<JSONArray> listener, ErrorListener errorListener) {
    this(jsonRequest == null ? Method.GET : Method.POST, url, jsonRequest, listener, errorListener);
}

@Override
protected Response<JSONArray> parseNetworkResponse(NetworkResponse response) {
    try {
        String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
        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 requestJsonObject = new JSONObject();
    requestJsonObject.put("first_name", firstName);
    requestJsonObject.put("last_name", lastName);
    requestJsonObject.put("email_address", emailId);
    requestJsonObject.put("password", password);

    CustomRequest jsonObjReq = new CustomRequest(Method.POST, YOUR_URL, requestJsonObject, responseListener, errorListener);

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