How to implement night theme in android application?

Question

Java

I want to make a night theme in my app that activates when a button is clicked. In this case, the activity should not be recreated (important). With a night theme, for example, the color of buttons, background, etc. changes

Answer 1

In this case, the activity should not be recreated (important)

Think carefully about whether this is so important, because changing the theme without recreating the activity will have to write a lot of code.
Details at the link: https://dimlix.com/switch-theme-android/