So, if you understand your question correctly, you need a tool to create an application using HTML and other web technologies.
One of the things I can recommend is PhoneGap Build by Adobe, basically you upload your HTML file and configuration file (instructions in the documentation) to the website, and then convert it to the application file. This can be used to create both Android and iOS (requires a signature certificate) is relatively easy.
This alone does not hide your HTML in the android XML, but allows you to create an interface in HTML that can then be compiled and compiled into the application.
PhoneGap Build Link: https://build.phonegap.com
There are other tools that use the same environment (Cordova) to achieve this, but I found that this is the easiest and most user-friendly way to do this.
Although this answer is late, I hope it ultimately helps someone!
Feel free to comment on any additional questions or requests, and I will be happy to contact them.
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