I\'m using a cookie in my app which works fine in all browsers, but in android device the cookie is not setting as fast as I wanted, it takes some time until cookie is saved
Nothing : "The WebView now automatically syncs cookies as necessary. You no longer need to create or use the CookieSyncManager."
As DarkKnight said, you can test if your app target below API 21 Lollipop (5.0), if not, you don't need anymore CookieSyncManager.