A `HttpStack` implementation for Volley that uses OkHttp 2.0 as its transport.

OkHttpStack.java

package com.ujuzicode.repocode;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

import com.android.volley.toolbox.HurlStack;
import com.squareup.okhttp.OkHttpClient;
 
/**
 * An {@link com.android.volley.toolbox.HttpStack HttpStack} implementation which
 * uses OkHttp as its transport.
 */
public class OkHttpStack extends HurlStack {
  private final OkHttpClient client;
 
  public OkHttpStack() {
    this(new OkHttpClient());
  }
 
  public OkHttpStack(OkHttpClient client) {
    if (client == null) {
      throw new NullPointerException("Client must not be null.");
    }
    this.client = client;
  }
 // The below is unusable as of OkHTTP 2.0
  /**@Override protected HttpURLConnection createConnection(URL url) throws IOException {
    return client.open(url);
  } */
  
  @Override protected HttpURLConnection createConnection(URL url) throws IOException {
	  return new OkUrlFactory(client).open(url);
	  }
}

OkUrlFactory.java

import com.squareup.okhttp.internal.InternalCache;
import com.squareup.okhttp.internal.huc.CacheAdapter;
import com.squareup.okhttp.internal.huc.HttpURLConnectionImpl;
import com.squareup.okhttp.internal.huc.HttpsURLConnectionImpl;
import java.net.HttpURLConnection;
import java.net.Proxy;
import java.net.ResponseCache;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;

public final class OkUrlFactory implements URLStreamHandlerFactory, Cloneable {
  private final OkHttpClient client;

  public OkUrlFactory(OkHttpClient client) {
    this.client = client;
  }

  public OkHttpClient client() {
    return client;
  }

  /** Sets the response cache to be used to read and write cached responses. */
  OkUrlFactory setResponseCache(ResponseCache responseCache) {
    client.setInternalCache(responseCache != null ? new CacheAdapter(responseCache) : null);
    return this;
  }

  ResponseCache getResponseCache() {
    InternalCache cache = client.internalCache();
    return cache instanceof CacheAdapter ? ((CacheAdapter) cache).getDelegate() : null;
  }

  /**
   * Returns a copy of this stream handler factory that includes a shallow copy
   * of the internal {@linkplain OkHttpClient HTTP client}.
   */
  @Override public OkUrlFactory clone() {
    return new OkUrlFactory(client.clone());
  }

  public HttpURLConnection open(URL url) {
    return open(url, client.getProxy());
  }

  HttpURLConnection open(URL url, Proxy proxy) {
    String protocol = url.getProtocol();
    OkHttpClient copy = client.copyWithDefaults();
    copy.setProxy(proxy);

    if (protocol.equals("http")) return new HttpURLConnectionImpl(url, copy);
    if (protocol.equals("https")) return new HttpsURLConnectionImpl(url, copy);
    throw new IllegalArgumentException("Unexpected protocol: " + protocol);
  }

  /**
   * Creates a URLStreamHandler as a {@link java.net.URL#setURLStreamHandlerFactory}.
   *
   * <p>This code configures OkHttp to handle all HTTP and HTTPS connections
   * created with {@link java.net.URL#openConnection()}: <pre>   {@code
   *
   *   OkHttpClient okHttpClient = new OkHttpClient();
   *   URL.setURLStreamHandlerFactory(new OkUrlFactory(okHttpClient));
   * }</pre>
   */
  @Override public URLStreamHandler createURLStreamHandler(final String protocol) {
    if (!protocol.equals("http") && !protocol.equals("https")) return null;

    return new URLStreamHandler() {
      @Override protected URLConnection openConnection(URL url) {
        return open(url);
      }

      @Override protected URLConnection openConnection(URL url, Proxy proxy) {
        return open(url, proxy);
      }

      @Override protected int getDefaultPort() {
        if (protocol.equals("http")) return 80;
        if (protocol.equals("https")) return 443;
        throw new AssertionError();
      }
    };
  }
}