我需要使用JSONObject发出请求，如下所示：
{
'LangIDs': [1, 2],
'GenreIDs': [4],
'LowPrice': 0,
'HighPrice': 999,
'SearchTerms': [],
'Pagination': {
'PageNumber': 0,
'PageLength': 10
}
}
预期的响应是JSONArray。使用Volley，我无法使用JSONObject参数创建JsonArrayRequest。
在我以这种方式提出请求之前：
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;
}
};
但现在它是包含JSONObject的JSONObject。
现在我如何使用Volley提出此请求？
答案 0 :(得分：8)
我创建了一个自定义排球请求，接受JSONObject作为参数。
<强> 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));
}
}
}
JSONObject body = new JSONObject();
// Your code, e.g. body.put(key, value);
CustomJsonArrayRequest req = new CustomJsonArrayRequest(Request.Method.POST, url, body, success, error);
答案 1 :(得分：0)
如果您的请求未发送和接收JSONArray，则无法扩展JsonArrayRequest;与JsonObjectRequest相同
为此你必须使用StringRequest，你应该覆盖getParams（）以给它你的JSONObject参数。
StringRequest customRequest = new new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> requestInfo = new HashMap();
//here add to your the request payload
requestInfo.put("LowPrice", "0");
return requestInfo;
},
@Override
public void onResponse(String response) {
//this code remains the same,
//you have to convert the String response to a JSONArray
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("Error:",error.getMessage());
}
});
答案 2 :(得分：-1)
使用以下类将json对象作为参数传递：
public class VolleyJSonRequest {
public void MakeJsonRequest(final String Tag, String url, final ArrayList<RequestModel> list, final ResponceLisnter responceLisnter, final String HeaderKey) {
Map<String, String> params = new HashMap<String, String>();
if (list.size() > 0) {
for (int i = 0; i < list.size(); i++) {
//MyLog.ShowLog(list.get(i).getKey(), list.get(i).getValue());
params.put(list.get(i).getKey(), list.get(i).getValue());
}
}
JSONObject obj = new JSONObject(params);
JsonArrayRequest jsObjRequest = new JsonArrayRequest
(Request.Method.POST, url, obj, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
try {
// Iterator x = response.keys();
// JSONArray jsonArray = new JSONArray();
//
// while (x.hasNext()){
// String key = (String) x.next();
// jsonArray.put(response.get(key));
// }
responceLisnter.getResponce(response.toString(), Tag);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(com.android.volley.VolleyError error) {
// TODO Auto-generated method stub
if (error instanceof TimeoutError || error instanceof NoConnectionError) {
responceLisnter.getResponceError(VolleyError.TIMEOUT_ERROR, Tag);
} else if (error instanceof AuthFailureError) {
responceLisnter.getResponceError(VolleyError.AUTH_ERROR, Tag);
} else if (error instanceof ServerError) {
error.printStackTrace();
responceLisnter.getResponceError(VolleyError.SERVER_ERROR, Tag);
} else if (error instanceof NetworkError) {
responceLisnter.getResponceError(VolleyError.NETWORK_ERROR, Tag);
}
}
}) {
/**
* Passing some request headers
* */
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
HashMap<String, String> headers = new HashMap<String, String>();
headers.put("Content-Type", HeaderKey);
return headers;
}
};
;
TestVolleyJson.getInstance().getRequestQueue().add(jsObjRequest);
jsObjRequest.setRetryPolicy(new DefaultRetryPolicy(50000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
}
}
在您的Application类中：
public class TestVolleyJson extends Application {
private static TestVolleyJson mInstance;
public static Context context;
private RequestQueue mRequestQueue;
public static synchronized TestVolleyJson getInstance() {
return mInstance;
}
@Override
public void onCreate() {
super.onCreate();
context = this;
mInstance = this;
mRequestQueue = Volley.newRequestQueue(this);
}
public RequestQueue getRequestQueue() {
return mRequestQueue;
}
}
发出requestModel：
public class RequestModel {
String Key;
String Value;
public ArrayList<JSONObject> getJsonObjects() {
return jsonObjects;
}
public void setJsonObjects(ArrayList<JSONObject> jsonObjects) {
this.jsonObjects = jsonObjects;
}
ArrayList<JSONObject> jsonObjects;
public RequestModel(String key, String value) {
this.Key = key;
this.Value = value;
}
public RequestModel(String key, ArrayList<JSONObject> jsonObjects) {
this.Key = key;
this.jsonObjects = jsonObjects;
}
public String getValue() {
return Value;
}
public void setValue(String value) {
Value = value;
}
public String getKey() {
return Key;
}
public void setKey(String key) {
Key = key;
}
}
并在您的活动中：
VolleyJSonRequest volleyJSonRequest = new VolleyJSonRequest();
ArrayList<RequestModel> list = new ArrayList<>();
list.add(new RequestModel("Param1", "abc"));
list.add(new RequestModel("Param2", "xyz"));
volleyJSonRequest.MakeJsonRequest("Tag", "URL", list, responceLisnter, "application/json; charset=utf-8");
}
ResponceLisnter responceLisnter = new ResponceLisnter() {
@Override
public void getResponce(String str, String Tag) throws JSONException {
if (Tag.equalsIgnoreCase("Logintest")) {
Log.e(Tag, " Response is" + str);
}
}
@Override
public void getResponceError(String errorStr, String Tag) {
}
};
建立一个响应者界面：
public interface ResponceLisnter {
void getResponce(String str, String Tag) throws JSONException;
void getResponceError(String errorStr, String Tag);
}
希望它对您有用