Customizing Android Location

The paths for Android SDK and related tools can be customized through environment variables

• ANDROID_HOME
• ANDROID_SDK_HOME

Android_Home is the location of the SDK folder (android-sdk), and Android_SDK_Home is the location where the .android folder will be stored. This folder (.android) contains your settings and virtual machine files.

To quit an app or not?

Excellent justification for not creating an explicit Exit app functionality in mobile applications:
http://stackoverflow.com/questions/2033914/quitting-an-application-is-that-frowned-upon