What step can be taken to change the color of your app's theme?

To change the color of your app's theme effectively, modifying the primary and secondary color theme attributes is the most appropriate step. This approach involves altering the color values in the app's resource files, specifically within the res/values/styles.xml or res/values/themes.xml (depending on your setup). By changing these attributes, you can maintain a consistent theme throughout your application, as these colors will be applied to various UI elements like buttons, backgrounds, and text across all activities and fragments.

This method is preferable because it allows for easier management and maintainability of your app's design. If you were to hard-code color values in layout files, it could lead to inconsistency and make it difficult to apply a unified theme throughout your app. Additionally, modifying only the activity layout files would not address the overall design and feel, as theme attributes influence a wider scope than individual layout elements. Changing the app's name does not affect the visual representation or theme colors directly—it is unrelated to altering visual styles.

Overall, adjusting the primary and secondary color theme attributes gives you a systematic, customizable, and scalable way to ensure your app's aesthetic aligns with your desired branding or design goals.