App Android (web view?)

We have a website that requires to login with an username and password. We need an android app (maybe web view based) that remembers the user by an unique alphanumeric token (that we generate for every single user). The app would show a splash image (that we provide), and would run our website in fullscreen mode (no address bar, etc). It should be possible to change the token in a settings section (the token should not been visible, but shown as dots or asterisks) The app should also let our webpage to identify that is being used for browsing the site, through any header sent in every request to the page. We would like the app to run from the lowest version of Android as possible