JsonResponseRequest.java

import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.toolbox.HttpHeaderParser;
import com.android.volley.toolbox.JsonObjectRequest;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.UnsupportedEncodingException;

public class JsonResponseRequest extends JsonObjectRequest {
    private final Response.Listener<JSONObject> mListener;

    /**
     * Creates a new request with the given method.
     *
     * @param method        the request {@link Method} to use
     * @param url           URL to fetch the string at
     * @param listener      Listener to receive the String response
     * @param errorListener Error listener, or null to ignore errors
     */
    public JsonResponseRequest(int method, String url, JSONObject jsonRequest,
                               Response.Listener<JSONObject> listener, Response.ErrorListener errorListener) {
        super(method, url, jsonRequest, listener, errorListener);
        mListener = listener;
    }

    /**
     * Creates a new GET request.
     *
     * @param url           URL to fetch the string at
     * @param listener      Listener to receive the String response
     * @param errorListener Error listener, or null to ignore errors
     */
    public JsonResponseRequest(String url, JSONObject jsonRequest, Response.Listener<JSONObject> listener,
                               Response.ErrorListener errorListener) {
        this(Request.Method.GET, url, jsonRequest, listener, errorListener);
    }

    @Override
    protected void deliverResponse(JSONObject response) {
        mListener.onResponse(response);
    }

    @Override
    protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
        try {
            return Response.success(new JSONObject(new String(response.data,
                            HttpHeaderParser.parseCharset(response.headers))),
                    HttpHeaderParser.parseCacheHeaders(response));
        } catch (UnsupportedEncodingException e) {
            return Response.error(new ParseError(e));
        } catch (JSONException je) {
            return Response.error(new ParseError(je));
        }
    }
}