How does the top part of the app calls (which is green with text "calculator")? I want to make an app with different styles on each layout, but I do not know how to google it. Answer is found, it calls "app bar"
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The first thing you have to do is change the default sytle of the app in style.xml or in the activity with Java/Kotlin code. This may help you.
After that you can add your custom app bar. Here a little example from Android Developers Blog.
Hope this useful to you.

Enzo Lizama
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