Android Studio vs Xamarin


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Android Studio
Android Studio is a new Android development environment based on IntelliJ IDEA. It provides new features and improvements over Eclipse ADT and will be the official Android IDE once it's ready.
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Xamarin
We created Xamarin because we knew there had to be a better way – a better way to design apps, to develop apps, to integrate apps, to test apps and more. We’re developers, so we know what developers want from mobile app development software: a modern programming language, code sharing across all platforms, prebuilt backend connectors and no-compromise native user interfaces.