Android Wrapper For Exiting ASP.NET site with Login Storage

We have an existing asp.net application which we wish to create an android wrapper. The wrapper should 1) Prompt and Store (with encryption) URL and Login Credentials 2) Automatically log into app 3) Detect login success and provide retry UI on failure 4) Display resulting page in webview 5) Host any new windows in tabbed webviews (this code is already implemented) 6) Provide a bottom bar with native buttons that navigate the page in the current webview via javascript calls We can handle any modifications needed to asp.net application (i.e. new JS methods/handlers to bridge between native and web code). The asp.net application is not using built in authentication, instead that is handled by custom server side code caused by a post back. asp.net application is using ajax extensions and update panels. Jquery is also used for client logic. Visio flow attached. Green steps native UI, blue web ui.