TAILIEUCHUNG - Android SDK (phần 2)

WHAT’S IN THIS CHAPTER? ➤ How to install the Android SDK, create a development environment, and debug your projects. Understanding mobile design considerations and the importance of optimizing for speed and efficiency and designing for small screens and mobile data connections. Using Android Virtual Devices, the emulator, and developer tools. ➤ ➤ All you need to start writing your own Android applications is a copy of the Android SDK and the Java development kit. Unless you’re a masochist, you’ll probably want a Java IDE — Eclipse is particularly well supported — to make development a little easier. Versions of the SDK, Java, and Eclipse are. | 2 Getting Started WHAT S IN THIS CHAPTER How to install the Android SDK create a development environment and debug your projects. Understanding mobile design considerations and the importance of optimizing for speed and efficiency and designing for small screens and mobile data connections. Using Android Virtual Devices the emulator and developer tools. All you need to start writing your own Android applications is a copy of the Android SDK and the Java development kit. Unless you re a masochist you ll probably want a Java IDE Eclipse is particularly well supported to make development a little easier. Versions of the SDK Java and Eclipse are available for Windows MacOS and Linux so you can explore Android from the comfort of whatever OS you favor. The SDK tools and emulator work on all three OS environments and because Android applications are run on a virtual machine there s no advantage to developing from any particular operating system. Android code is written with Java syntax and the core Android libraries include most of the features from the core Java APIs. Before they can be run though your projects must first be translated into Dalvik byte code. As a result you get the benefits of using Java while your applications have the advantage of running on a virtual machine optimized for mobile devices. The SDK download includes all the Android libraries full documentation and excellent sample applications. It also includes tools to help you write and debug your applications like the Android Emulator to run your projects and the Dalvik Debug Monitoring Service DDMS to help debug them. By the end of this chapter you ll have downloaded the Android SDK set up your development environment completed two new applications and run and debugged them with the DDMS using the emulator running on an Android Virtual Device. If you ve developed for mobile devices before you already know that their small-form factor limited power and restricted memory create some unique design .

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