English
资源说明：Android is an open source operating system for mobile phones and tablets
that was created by Google and its partners and contributors. It’s inside over
a billion cell phones and other mobile devices, making Android the #1 platform
for application developers. Whether you’re a hobbyist or a professional programmer,
whether you’re doing it for fun or for profit, you need to learn more
about developing for Android. This book will help you get started.
What Makes Android Special?
Many other mobile platforms are available on the market today, including
iOS, Windows, Tizen, Firefox OS, and more. So why do people choose Android
over the others? What’s the difference?
Although some of its features have appeared before, Android is the first
environment that combines the following:
• An open, free development platform based on Linux and open source:
Handset makers like it because they can use and customize the platform
without paying a royalty. Developers like it because they know that the
platform “has legs” and is not locked into any one vendor that may go
under or be acquired.
• A component-based architecture inspired by Internet mashups: Parts of
one application can be used in ways not originally envisioned by the
developer. You can even replace built-in components with your own
improved versions. This has unleashed a new round of creativity in the
mobile space.
• Tons of services out of the box: Location-based services use GPS or cell
tower triangulation to allow you to customize the user experience
depending on where you are. A full-powered SQL database lets you harness
the power of local storage for occasionally connected computing and
synchronization. Browser and map views can be embedded directly in
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your applications. All these capabilities help raise the bar on functionality
while lowering your development costs.
• Automatic management of the application life cycle: Programs are isolated
from each other by multiple layers of security, which provide a high level
of system stability. The end user doesn’t have to worry about what applications
are active or close some programs so that others can run. Android
is optimized for low-power, low-memory devices in a fundamental way
that no previous platform has attempted.
• High-quality graphics and sound: Smooth, antialiased 2D and 3D-accelerated
graphics have enabled new kinds of games and business applications.
Codecs for the most common industry-standard audio and video formats
are built right in, including H.264 (AVC), MP3, and AAC.
• Portability across a wide range of current and future hardware: All your
programs are written in Java and executed by Android’s ART ahead-oftime
compiler or Dalvik virtual machine, so your code will be portable
across ARM, x86, and other architectures. Support for a variety of input
methods is included, such as keyboards, game pads, touch, TV remotes,
mice, and trackballs. User interfaces can be customized for any screen
resolution and orientation.
Android offers a fresh take on the way mobile applications interact with users,
along with the technical underpinnings to make it possible. But the best part
of Android is the software that you’re going to write for it. This book will help
you get off to a great start
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