Android developers could use the Android Development Tools (ADT) plug-in for the Eclipse IDE, but Android Studio will be the first dedicated IDE for the mobile OS. Google built Android Studio on the base of IntelliJ’s Idea Java IDE.
Apple invested a lot of effort into its Xcode IDE in order to make it easy for developers to write apps for the iOS iPhone and iPad that compete with Android.
It was presented during the Google I/O 2013 Keynote presentation Hugo Barra that Google is working on a new integrated development environment (IDE) for Android app development. It aims to resolve some of the difficulties that Android developers face when developing apps.

Besides all the sophisticated features like code completion, code analysis, and Android specific code re-factoring, the new IDE includes a built-in layout previewer. This will be a big bonus for app 

developers for a couple of very important reasons. First getting an app’s user interface right can be hard. Although actually adding the different components to a UI is relatively simple, actually making that design easy to use and intuitive can be difficult. By adding new design tools including the preview mode Google is trying to make that job easier. Often the difference between a good app and a bad app can just be the design of the UI, regardless of the level or completeness of the functionality. 

The new preview window is live in the sense that it reflects changes to the XML in the layout file as the developer types. As soon as a new component is added it will appear in the preview without the need to manually re-render it.

Watch as Tor Norbye gives a quick a preview of Android Studio:

Download the IDE here:  Android Studio


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