WebView to accept mobile website cookies - repost

Hello freelancers, I've been trying to create a webview android based application that opens a mobile website. So far the application is working great but I'm looking forward to extend its functionality in order to store cookies. The mobile website that I'm viewing with the app uses cookies that saves the user's session. I can confirm that the functionality works with the built-in android browser but I would like to have that feature in my webview app. Basically after logging in on the mobile website I want to have a cookie stored, and based on that, grant additional access to other parts of the mobile website. All of this should be made just by using webview, nothing native or complicated. cookies should expire after a month. I'm looking for someone who has done this for another application and can basically "fix" the code to my needs. I'm unable to disclose the website in question so I demand to receive the amended source code and compile it on my side. I've attached the current app activity and I'll be able to provide the xml, manifest if needed. Regards