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Android requirement:

• Microsoft Windows XP or later version.
• Mac OS X 10.5.8 or later version with Intel chip.
• Linux including GNU C Library 2.7 or later.

And you must install some application before you start your Android application programming.

• Java JDK5 or later version
• Android SDK
• Java Runtime Environment (JRE) 6

Step 1: install Java Runtime Environment (JRE)

You can download here

Eg: for windows 7 64bits: Download: jre-8u66-windows-x64.exe

Step 2: install JDK
Download: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

Step 3: install Andoid studio: Download: http://developer.android.com/sdk/index.html

Now you can use Andoid Studio but you must configure SDK:

Step 4: goto configure -> project defaults -> project structure