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Extras for AA uses Substratum to heavily customize Android Auto's in-car UI
Extras for AA is a Substratum theme created by XDA Senior Member shmykelsa that helps you to modify the in-car UI elements of Android Auto.
If you've dabbled in custom themes on Android, then the name “Substratum” may ring a bell. The overlay-based theming mechanism dynamically modifies the resources of an app without actually touching the corresponding APK. Such a design makes Substratum an ideal solution to alter the UI elements of apps like Android Auto that otherwise offer very few customization options. In fact, last year we covered a mod that used Substratum theming to change the Android Auto wallpaper.
[Update: Video] Substratum Lite launches with a faster, smaller, and more stable experience
Substratum Lite is a new version of the popular theme engine that promises to be faster, smaller, and more stable, plus it already supports Android Q.
Substratum Lite is the newest release from Projekt and they're billing it as the "most essential features, in a light package." This new version aims to be faster, smaller, and more stable, plus it already supports Android Q (in preview). The development of Substratum Lite was lead by Ivan Iskandar, one of the Substratum developers.