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Volley is a network library from Android source code.
There is a newer version: 2.0.1
/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.volley.toolbox;

import com.android.volley.NetworkResponse;
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 java.io.UnsupportedEncodingException;

/**
 * A request for retrieving a T type response body at a given URL that also
 * optionally sends along a JSON body in the request specified.
 *
 * @param  JSON type of response expected
 */
public abstract class JsonRequest extends Request {
    /** Default charset for JSON request. */
    protected static final String PROTOCOL_CHARSET = "utf-8";

    /** Content type for request. */
    private static final String PROTOCOL_CONTENT_TYPE =
        String.format("application/json; charset=%s", PROTOCOL_CHARSET);

    private Listener mListener;
    private final String mRequestBody;

    /**
     * Deprecated constructor for a JsonRequest which defaults to GET unless {@link #getPostBody()}
     * or {@link #getPostParams()} is overridden (which defaults to POST).
     *
     * @deprecated Use {@link #JsonRequest(int, String, String, Listener, ErrorListener)}.
     */
    public JsonRequest(String url, String requestBody, Listener listener,
            ErrorListener errorListener) {
        this(Method.DEPRECATED_GET_OR_POST, url, requestBody, listener, errorListener);
    }

    public JsonRequest(int method, String url, String requestBody, Listener listener,
            ErrorListener errorListener) {
        super(method, url, errorListener);
        mListener = listener;
        mRequestBody = requestBody;
    }

    @Override
    protected void onFinish() {
        super.onFinish();
        mListener = null;
    }

    @Override
    protected void deliverResponse(T response) {
        if (mListener != null) {
            mListener.onResponse(response);
        }
    }

    @Override
    abstract protected Response parseNetworkResponse(NetworkResponse response);

    /**
     * @deprecated Use {@link #getBodyContentType()}.
     */
    @Override
    public String getPostBodyContentType() {
        return getBodyContentType();
    }

    /**
     * @deprecated Use {@link #getBody()}.
     */
    @Override
    public byte[] getPostBody() {
        return getBody();
    }

    @Override
    public String getBodyContentType() {
        return PROTOCOL_CONTENT_TYPE;
    }

    @Override
    public byte[] getBody() {
        try {
            return mRequestBody == null ? null : mRequestBody.getBytes(PROTOCOL_CHARSET);
        } catch (UnsupportedEncodingException uee) {
            VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s",
                    mRequestBody, PROTOCOL_CHARSET);
            return null;
        }
    }
}