Google Launches Android Studio | Installing Android Studio v 1.0

1. Download the Android Studio package from below.
2. Install Android Studio and the SDK tools:
   Windows:
   1. Launch the downloaded EXE file, android-studio-bundle-.exe.
   2. Follow the setup wizard to install Android Studio.
   Mac OS X:
   1. Open the downloaded DMG file, android-studio-bundle-.dmg.
   2. Drag and drop Android Studio into the Applications folder.
   Linux:
   1. Unpack the downloaded Tar file, android-studio-bundle-.tgz, into an appropriate location for your applications.
   2. To launch Android Studio, navigate to the android-studio/bin/ directory in a terminal and execute studio.sh.
      You may want to add android-studio/bin/ to your PATH environmental variable so that you can start Android Studio from any directory.

That's it! You're ready to start developing apps with Android Studio.

Note: On Windows and Mac, the individual tools and other SDK packages are saved within the Android Studio application directory. To access the tools directly, use a terminal to navigate into the application and locate the sdk/directory. For example:

Windows: \Users\\AppData\Local\Android\android-studio\sdk\

Mac: /Applications/Android\ Studio.app/sdk/

Starting a Project

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When you launch Android Studio for the first time, you'll see a Welcome screen that offers several ways to get started:

• To start building a new app, click New Project.
  This starts the New Project wizard, which helps you set up a project using an app template.
• To import an existing Android app project, click Import Project.
  Note: If you previously developed your Android project with Eclipse, you should first use the new export feature in the ADT plugin to prepare your project with the new Gradle build system. For more information, read Migrating from Eclipse.

For additional help using Android Studio, read Tips and Tricks.

As you continue developing apps, you may need to install additional versions of Android for the emulator and other packages such as the Android Support Library. To install more packages, use the SDK Manager, which you can open from Android Studio by clicking SDK Manager  in the toolbar

 Android Studio v0.1

Platform	Package	Size
Windows	android-studio-bundle-130.677228-windows.exe	382109250 bytes
Mac OS X	android-studio-bundle-130.677228-mac.dmg	371607412 bytes
Linux	android-studio-bundle-130.677228-linux.tgz	400487529 bytes

  SOURCE : http://developer.android.com/sdk/installing/studio.html#Installing