Reddit mentions of Embedded Programming with Android: Bringing Up an Android System from Scratch (Android Deep Dive)

Although old, this book does a very good job explaining the Android architecture https://www.amazon.com/Embedded-Android-Porting-Extending-Customizing/dp/1449308295

Given it was written for Android 4, it doesn't have all the new Treble staff (the basis are still the same, so I think it's still worth reading), but the author has a set of slides that you can read after the book to get the recent changes: https://www.slideshare.net/opersys/presentations

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Another useful book is https://www.amazon.com/Embedded-Programming-Android-Bringing-Scratch/dp/0134030001 . This one focuses more on getting AOSP running on a new device, and not that much in its internals or customization.

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Two newer books I have recently found (although I haven't had time to read them) are https://www.amazon.com/Android-System-Programming-customizing-debugging/dp/178712536X (same author as the previous one, content mostly related to building the kernel and getting AOSP running in a new device/emulator) and https://www.amazon.com/Learning-Embedded-Android-N-Programming-ebook/dp/B01841W9AU

They are still pre-treble, but they are probably still useful.

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Besides those, if you want something more related to internals and not so much on how to "get the source code and build AOSP", you could check https://www.amazon.com/Android-Security-Internals-Depth-Architecture/dp/1593275811 and https://www.amazon.com/Android-Hackers-Handbook-Joshua-Drake/dp/111860864X

Thanks; this seems up-to date and good for what i am looking for. Just as an FYI, you might also find the following useful;

• [Embedded Programming with Android: Bringing up an Android System from Scratch] (https://www.amazon.com/Embedded-Programming-Android-Bringing-Scratch/dp/0134030001/ref=sr_1_1?s=books&ie=UTF8&qid=1538713227&sr=1-1&keywords=Embedded+Android)