Thanks Calviղ an accomplishment I couldn't have done without your help!
Sonic I have made a few but I use Android Studio which does require a little tinkering with the Java and XML as well but it's pretty easy if you use this excellent example by Krishna Teja Yeluripati Best of Luck!
For me use a WebView is an old cheat mode for accomplish this... Today is much better use apposited frameworks like ReactNative, NativeScript and Tabris or, for scripting purpose, create a main java/kotlin app and use binding to some js engine (or an implementation in pure java) like J2V8, Rhino, Ducktape etc. Just my thought
I have created an app with pure React Native. I really recommend using it - it is extremely easy to understand and use. You can use Expo to create your app, so as to avoid downloading Android Studio, XCode etc.