Overriding Theme Attributes
Now that the colors are worked out, it is time to dive in and see what theme attributes exist that you can override. Be warned, theme spelunking is tough. There is little to no documentation about which attributes exist, which ones you can override yourself, and even what the attributes do. You are going off the map here. It is a good thing you have this book to be your guide.
Your first goal is to change the background color of BeatBox by altering the theme. While you could navigate to res/layout/fragment_beat_box.xml and manually set the android:background attribute on your RecyclerView – and then repeat the process in every other fragment and activity layout file that might exist – this would be wasteful. ...
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