Androids: The team that built the Android operating system is a new book from longtime Android engineer Chet Haase. Haase has been on the Android team since 2010, and he interviewed dozens of Googlers for this book, which offers a behind-the-scenes look at early Android development.
https://arstechnica.com/information-technology/2021/08/excerpt-the-history-of-android-as-written-by-a-longtime-android-developer/
https://arstechnica.com/information-technology/2021/08/excerpt-the-history-of-android-as-written-by-a-longtime-android-developer/