After you installed the Android SDK, it’s a good idea to add the tools directory to your search path, which includes a useful collection of command-line tools.
Suppose you install the Android in”D:\ android-sdk-windows\tools”, there two methods to set the PATH, one is use the command:
set path=%path%;D:\ android-sdk-windows\tools;
Another is by:
My Computer->Property->Advanced->Environment Variables->Edit Path Variable and add “D:\ android-sdk-windows\tools” into the Path Variables.
Linux and Mac:
Edit the ~/.bashrc or ~/.bash_profile, add “export PATH=$PATH:/tools”, such as:
1. Linux：export PATH=$PATH: /android-sdk-linux/tools
2. Mac：export PATH=$PATH: /android-sdk-Mac_x86/tools
After saved the file, excuting “source ./.bashrc ” to make the PATH setting become effective.