Download the Android Studio package from below link.
http://developer.android.com/sdk/installing/studio.html
Install Android Studio and the SDK tools:
Windows:
Launch the downloaded EXE file, android-studio-bundle-<version>.exe.
Follow the setup wizard to install Android Studio.
Known issue: On some Windows systems, the launcher script does not find where Java is installed. If you encounter this problem, you need to set an environment variable indicating the correct location.
Select Start menu > Computer > System Properties > Advanced System Properties. Then open Advanced tab > Environment Variables and add a new system variable JAVA_HOME that points to your JDK folder, for example C:Program FilesJavajdk1.7.0_21.
Mac OS X:
Open the downloaded DMG file, android-studio-bundle-<version>.dmg.
Drag and drop Android Studio into the Applications folder.
Known issue: Depending on your security settings, when you attempt to open Android Studio, you might see a warning that says the package is damaged and should be moved to the trash. If this happens, go to System Preferences > Security & Privacy and under Allow applications downloaded from, select Anywhere. Then open Android Studio again.
Linux:
Unpack the downloaded Tar file, android-studio-bundle-<version>.tgz, into an appropriate location for your applications.
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<user>AppDataLocalAndroidandroid-studiosdk
Mac: /Applications/Android Studio.app/sdk/