How to make custom windowBackground theme style work on all Android devices?

Question

I am trying to get all of my activities to have a custom theme style that should look like this:

Answer 1

I found that the latest version of Android Studio expect that the parent for the style needs to be Theme.AppCompat. Also, it is good style to create a colors.xml file in the values directory (with named color elements between the resource tags). Put your RGB values as values to the named color elements. Reference them in your styles with @color/.

    #ffb62a23
    #ffedeba6
    #00ff00