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Introduction
The Android open platform, which was introduced in 2007, is now in more than
50 million devices. The application store statistics show billions of downloads.
It has literally conquered the mobile handset market, overtaking many
established players. It is also expanding beyond mobile platforms into unique
products such as the Android Stick, which converts a normal TV to a smart
one.
If you are a developer who works on embedded systems, there is no escape
from this ever-growing platform. This inevitability creates a need for good
reference books for engineers who are interested in getting started with
Android. There are many books in the market covering Android application
programming and its development environment. If you are looking for
something like that in this book, you are in the wrong place. This book is much
more than that. The book explains the complete Android framework, from the
API to the internals of Android, along with the kernel below them.
This book exclusively covers the internals of the Android USB framework. Why
USB? Similar to the Android platform, USB is also inevitable in the embedded
world. On the Android platform, USB is the primary connectivity solution, as an
interface used to debug and also as an interface used to charge the batteries
of the Android device.
Does this mean this book is only for USB engineers? In fact, it will be useful to
any developer working on the Android platform. Why?
If you are a multimedia developer on the Android platform, you need USB for
media transfer or to play back audio. This book explores MTP and USB audio
in both USB device and USB host modes.
If you are a core developer who works on charging, you need to understand
the USB charging specifications, which are explained in the book.
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