When the SDK is installed from the ''tools'' subdirectory run the '''android''' command.
This will allow you to update the version of the SDK to the latest version and fixes.
In addition from the ''Tools'' menu item you can crate and manage AVD's which are phone configurations.
An AVD is required to test an application.
Running the Emulator
Once the environment is installed and an AVD is created it is possible to test an application.