Android. webview in the background. How?

Question

Android

Hello.
I am writing a simple application (10-20 lines), the point is that the application should go to the page and hang on the page while the application is on.
I use WebView, the page comes and weighs while the application is active. It is necessary to collapse - the application is slowed down, you deploy - it continues to work. You have to lock the screen on the active application. Then everything works.
I started to study how the service works, I tried it and it did not work out.
Can anyone give me an idea or suggest how to implement it?