Eclipse Mobile Mousw Manual do Utilizador descarregar pdf (Página 4)

platforms, including servers, desktop computers, networking appliances, and

mobile-computing devices. Android runs on top of a Linux kernel.

Dalvik Virtual Machine

The Dalvik VM is an operating environment found in the Android stack, which

interprets application code at runtime. The Dalvik VM is similar to a compliant

Java VM, but the two are not compatible.

Android basics and required tools

Android is an open source operating system targeted for mobile platforms. At the

time of this writing, it is a software-only platform with no publicly available hardware

devices.

The Android platform is best described as a stack because it is a collection of

components, including:

• Linux kernel-based operating system

• Java programming environment

• Tool chain, including compiler, resource compiler, debugger, and

emulator

• Dalvik VM for running applications

Now that we've briefly introduced the Android platform architecture, let's look at

some important characteristics of the platform from a market perspective.

Why is Android important?

The computer technology press has lavished attention on Android since its

announcement and initial SDK release. Android is important as a platform for two

disparate, yet compelling, reasons, among many others.

Android is a market-mover. The mobile-application space is crowded and difficult to

gain footing for a newcomer. Google has the resources and the mind-share to make

a splash in any market it puts in its sights. Google's entry into the mobile space has

been in the works for a few years. Android was a separate and distinct company

purchased by Google to give it a jump-start on a mobile presence. Anything Google

is doing gets attention, and publicity is good for introducing new platforms. Score

one for Android.

The second reason Android is important is because of its application model. Android

applications are not monolithic, menu-laden applications that require a great deal of

developerWorks® ibm.com/developerWorks

Develop Android applications with Eclipse

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