Android basic persistent cookie manager for Volley. This cookie store wraps the default CookieManager store to store the session cookie. It use's Gson to json serialize the cookie and store it as a json string in SharedPreferences.

PersistentCookieStore.java

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Lukas Zorich
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import android.content.Context;
import android.content.SharedPreferences;

import com.google.gson.Gson;

import java.net.CookieManager;
import java.net.CookieStore;
import java.net.HttpCookie;
import java.net.URI;
import java.util.List;

/**
 * Repository for cookies. CookieManager will store cookies of every incoming HTTP response into
 * CookieStore, and retrieve cookies for every outgoing HTTP request.
 * <p/>
 * Cookies are stored in {@link android.content.SharedPreferences} and will persist on the
 * user's device between application session. {@link com.google.gson.Gson} is used to serialize
 * the cookies into a json string in order to be able to save the cookie to
 * {@link android.content.SharedPreferences}
 * <p/>
 * Created by lukas on 17-11-14.
 */
public class PersistentCookieStore implements CookieStore {

    /**
     * The default preferences string.
     */
    private final static String PREF_DEFAULT_STRING = "";

    /**
     * The preferences name.
     */
    private final static String PREFS_NAME = PersistentCookieStore.class.getName();

    /**
     * The preferences session cookie key.
     */
    private final static String PREF_SESSION_COOKIE = "session_cookie";

    private CookieStore mStore;
    private Context mContext;

    /**
     * @param context The application context
     */
    public PersistentCookieStore(Context context) {
        // prevent context leaking by getting the application context
        mContext = context.getApplicationContext();

        // get the default in memory store and if there is a cookie stored in shared preferences,
        // we added it to the cookie store
        mStore = new CookieManager().getCookieStore();
        String jsonSessionCookie = getJsonSessionCookieString();
        if (!jsonSessionCookie.equals(PREF_DEFAULT_STRING)) {
            Gson gson = new Gson();
            HttpCookie cookie = gson.fromJson(jsonSessionCookie, HttpCookie.class);
            mStore.add(URI.create(cookie.getDomain()), cookie);
        }
    }

    @Override
    public void add(URI uri, HttpCookie cookie) {
        if (cookie.getName().equals("sessionid")) {
            // if the cookie that the cookie store attempt to add is a session cookie,
            // we remove the older cookie and save the new one in shared preferences
            remove(URI.create(cookie.getDomain()), cookie);
            saveSessionCookie(cookie);
        }

        mStore.add(URI.create(cookie.getDomain()), cookie);
    }

    @Override
    public List<HttpCookie> get(URI uri) {
        return mStore.get(uri);
    }

    @Override
    public List<HttpCookie> getCookies() {
        return mStore.getCookies();
    }

    @Override
    public List<URI> getURIs() {
        return mStore.getURIs();
    }

    @Override
    public boolean remove(URI uri, HttpCookie cookie) {
        return mStore.remove(uri, cookie);
    }

    @Override
    public boolean removeAll() {
        return mStore.removeAll();
    }

    private String getJsonSessionCookieString() {
        return getPrefs().getString(PREF_SESSION_COOKIE, PREF_DEFAULT_STRING);
    }

    /**
     * Saves the HttpCookie to SharedPreferences as a json string.
     *
     * @param cookie The cookie to save in SharedPreferences.
     */
    private void saveSessionCookie(HttpCookie cookie) {
        Gson gson = new Gson();
        String jsonSessionCookieString = gson.toJson(cookie);
        SharedPreferences.Editor editor = getPrefs().edit();
        editor.putString(PREF_SESSION_COOKIE, jsonSessionCookieString);
        editor.apply();
    }

    private SharedPreferences getPrefs() {
        return mContext.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
    }
}

The following code should be included before calling the request queue. Ex: at the start of the application.

CookieManager cookieManager = new CookieManager(new PersistentCookieStore(mContext), CookiePolicy.ACCEPT_ORIGINAL_SERVER);
CookieHandler.setDefault(cookieManager);

For example:

    public static synchronized MySingleton getInstance(Context context) {
        if (mInstance == null) {
            mInstance = new MySingleton(context);

            CookieManager cookieManager = new CookieManager(new PersistentCookieStore(context), CookiePolicy.ACCEPT_ORIGINAL_SERVER);
            CookieHandler.setDefault(cookieManager);
        }
        return mInstance;
    }

Thanks for documenting how you did it. :) So does this mean that the cookie will survive the lifetime of the app and will be part of the request headers on subsequent request between activities?