Are there libraries on Android that allow you to work with the device through WebView as native code?

Question

Android

That is, for example, on JS, get access to memory, Bluetooth, accelerometer and other sensors and modules. For writing a WebView application.

Answer 1

You can do all this by writing the appropriate JavaScriptInterface.

Answer 2

This cannot be, because otherwise, it would be a colossal security hole. It would be possible to write a JS script on any page, going to which ... well, then the options are limited only by the richness of imagination.