An attempt at a GsonObjectRequest that will post and return objects using Volley

GsonObjectRequest.java

package com.example.network.requests;

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

import com.android.volley.AuthFailureError;
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.VolleyLog;
import com.android.volley.toolbox.HttpHeaderParser;
import com.example.utils.Utils;
import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;

public abstract class GsonObjectRequest<R, T> extends Request<T> {

	protected Gson gson;
	private Listener<T> listener;
	private Class<R> inputType;
	private Class<T> outputType;
	private R object;

	private static final String PROTOCOL_CHARSET = "utf-8";

	public GsonObjectRequest(int method, String url, R postObject, Class<R> inputType, Class<T> outputType, Listener<T> listener, ErrorListener errorListener) {
		super(method, url, errorListener);
		this.listener = listener;
		this.inputType = inputType;
		this.outputType = outputType;
		this.object = postObject; 
		gson = Utils.getGson();
	}
	
	@Override
	public Map<String, String> getHeaders() throws AuthFailureError {
		Map<String, String> headers = null;
		return headers != null ? headers : super.getHeaders();
	}

	@Override
	public byte[] getBody() {
		String jsonString = gson.toJson(object, inputType);
		try {
			return jsonString.getBytes(PROTOCOL_CHARSET);
		} catch (UnsupportedEncodingException e) {
			VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s", jsonString, PROTOCOL_CHARSET);
			return null;
		}
	}

	@Override
	protected void deliverResponse(T response) {
		listener.onResponse(response);
	}

	@Override
	protected Response<T> parseNetworkResponse(NetworkResponse response) {
		try {
			String json = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
			return Response.success(gson.fromJson(json, outputType), HttpHeaderParser.parseCacheHeaders(response));
		} catch (UnsupportedEncodingException e) {
			return Response.error(new ParseError(e));
		} catch (JsonSyntaxException e) {
			return Response.error(new ParseError(e));

		}
	}

}