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Your styles.xml would also be the right place to add more themes-which in turn you could preview in Android Studio.

These colors get used by the theme generated at project creation, looking like this in styles.xml: could also remove the reference and edit the colors in the theme directly, but that is usually not the clean way. Locate your colors.xml in res/values/ and modify the colors there: Usually this would be the AppTheme that is referencing some colors.

Here you can see the background and color scheme for all three themes. Choose the right theme from the drop-down and click on Apply and then Ok. Under the Appearance & Behaviour -> Appearance, you will find Theme. A new Settings dialog will appear, like this. To actually change the colors you need to change the theme. To change default themes go to File and click on Settings. When you create your first ever application or select a new project in Android Studio you must have seen that the default color theme of the Titlebar (Toolbar) is purple. It does not change the theming on your phone when running your app-it is just a preview. This is used to view how your layout would look using a given theme. You are changing the theme of the preview window.