Just finished reading the book - "Android Hackers Handbook". Truth be told, you can't find any other book which covers Android security and exploitation in such a detailed approach like this one.

After reading through each chapter, you'll feel like you've gained a huge knowledge base, which you could immediately apply in real-life scenario. I personally liked 4 chapters out of the total 13 the most - Debugging and Analysing Vulnerabilities (Chap7), User Space (Chap 8) Exploitation, ROP(Chap9) and Attacking RIL (Chap 11) .

Almost all of the concepts are explained along with the real code sample, which will help you when you try it out on your device. A perfect 5 for this book coming from the experts in Android Security.