VolleyでCookieを設定してマルチリクエストをする方法

#概要
VolleyでCookieを設定した状態で複数通信リクエストを行うとエラーが発生して通信が失敗する場合がある

#詳細

以下のようなエラーログが出力される。

10-31 17:37:37.484: E/Volley(2448): java.lang.IllegalStateException: Adapter is detached.
10-31 17:37:37.484: E/Volley(2448): at org.apache.http.impl.conn.AbstractPooledConnAdapter.assertAttached(AbstractPooledConnAdapter.java:90)
10-31 17:37:37.484: E/Volley(2448): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:118)
10-31 17:37:37.484: E/Volley(2448): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
10-31 17:37:37.484: E/Volley(2448): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
10-31 17:37:37.484: E/Volley(2448): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-31 17:37:37.484: E/Volley(2448): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-31 17:37:37.484: E/Volley(2448): at com.android.volley.toolbox.HttpClientStack.performRequest(HttpClientStack.java:87)
10-31 17:37:37.484: E/Volley(2448): at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:93)
10-31 17:37:37.484: E/Volley(2448): at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:110)
10-31 17:37:37.584: E/Volley(2448): [232] NetworkDispatcher.run: Unhandled exception java.lang.IllegalStateException: No wrapped connection.
10-31 17:37:37.584: E/Volley(2448): java.lang.IllegalStateException: No wrapped connection.
10-31 17:37:37.584: E/Volley(2448): at org.apache.http.impl.conn.AbstractClientConnAdapter.assertValid(AbstractClientConnAdapter.java:163)
10-31 17:37:37.584: E/Volley(2448): at org.apache.http.impl.conn.AbstractClientConnAdapter.getRemotePort(AbstractClientConnAdapter.java:314)
10-31 17:37:37.584: E/Volley(2448): at org.apache.http.client.protocol.RequestAddCookies.process(RequestAddCookies.java:137)
10-31 17:37:37.584: E/Volley(2448): at org.apache.http.protocol.BasicHttpProcessor.process(BasicHttpProcessor.java:290)
10-31 17:37:37.584: E/Volley(2448): at org.apache.http.protocol.HttpRequestExecutor.preProcess(HttpRequestExecutor.java:160)
10-31 17:37:37.584: E/Volley(2448): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:408)
10-31 17:37:37.584: E/Volley(2448): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
10-31 17:37:37.584: E/Volley(2448): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-31 17:37:37.584: E/Volley(2448): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-31 17:37:37.584: E/Volley(2448): at com.android.volley.toolbox.HttpClientStack.performRequest(HttpClientStack.java:87)
10-31 17:37:37.584: E/Volley(2448): at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:93)
10-31 17:37:37.584: E/Volley(2448): at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:110)

#解決法
RequestQueueを生成する時にthreadPoolSizeに1を設定する

サンプル

public static RequestQueue newRequestQueue(Context context, HttpStack stack) {
        File cacheDir = new File(context.getCacheDir(), DEFAULT_CACHE_DIR);

        String userAgent = "volley/0";
        try {
            String packageName = context.getPackageName();
            PackageInfo info = context.getPackageManager().getPackageInfo(packageName, 0);
            userAgent = packageName + "/" + info.versionCode;
        } catch (NameNotFoundException e) {
        }

        if (stack == null) {
            if (Build.VERSION.SDK_INT >= 9) {
                stack = new HurlStack();
            } else {
                // Prior to Gingerbread, HttpUrlConnection was unreliable.
                // See: http://android-developers.blogspot.com/2011/09/androids-http-clients.html
                stack = new HttpClientStack(AndroidHttpClient.newInstance(userAgent));
            }
        }

        Network network = new BasicNetwork(stack);

       RequestQueue queue = new RequestQueue(new DiskBasedCache(cacheDir), network, 1);
        queue.start();

        return queue;
}

VolleyクラスのnewRequestQueueをコピーしてRequestQueueの生成部分を変えているだけです。
どうもCookie設定を設定している場合は複数のNetworkDispatchrで使用するのに問題があるようです。

#参照
##ネットワーク通信用ライブラリVolleyを使いこなす
http://techbooster.org/android/hacks/16474/
##java.lang.IllegalStateException: Adapter is detached
http://stackoverflow.com/questions/22804643/java-lang-illegalstateexception-adapter-is-detached