Definition of environment variables.
Environment variables contains the path of windows already installed folders, software and files. The path representing string is %windir% . There are lots of software installed on windows computer but every software run on a perfect compilation platform.
How to set environment variables in windows for android development.
1.Right click on My Computer > Properties.
2. Click on Advanced system settings.
3. Select Advanced > Environment variables.
4. Click on New under System variables.
5. Enter variable name as JAVA_HOME & variable value as C:\Program Files (x86)\Java\jdk1.7.0_72 .
6. Now Find Path Select it then click on edit.
7. First type ; ( Semicolon ) separate then paste here Android SDK installation folder platform tools and tools folder path like i do. F:\Software\Android Development\Latest SDK manager\platform-tools ; F:\Software\Android Development\Latest SDK manager\tools .