CustomRequest is a way to solve the Volley's JSONObjectReuqest cant post paramsters like the StringRequest

CustomRequest.java

package com.greenchiu.nets;

import java.io.UnsupportedEncodingException;
import java.util.Map;

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

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


public class CustomRequest extends Request<JSONObject> {

  private Listener<JSONObject> listener;
  private Map<String, String> params;
	public CustomRequest(String url, Map<String, String> params, Listener<JSONObject> reponseListener, ErrorListener errorListener) {
		super(Method.GET, url, errorListener);
		this.listener = reponseListener;
		this.params = params;
	}

	public CustomRequest(int method,String url, Map<String, String> params, Listener<JSONObject> reponseListener, ErrorListener errorListener){
		super(method, url, errorListener);
		this.listener = reponseListener;
		this.params = params;
	}
	
	protected Map<String, String> getParams() throws com.android.volley.AuthFailureError {
        return params;
    };
	
	@Override
	protected Response<JSONObject> parseNetworkResponse(NetworkResponse response) {
		try {
            String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
            return Response.success(new JSONObject(jsonString),
            HttpHeaderParser.parseCacheHeaders(response));
        } catch (UnsupportedEncodingException e) {
            return Response.error(new ParseError(e));
        } catch (JSONException je) {
            return Response.error(new ParseError(je));
        }
	}

	@Override
	protected void deliverResponse(JSONObject response) {
		// TODO Auto-generated method stub
		listener.onResponse(response);
	}
	
}