SDK Manager

The Android SDK separates tools, platforms, and other components into packages you can download using the SDK Manager.

You can launch the SDK Manager in one of the following ways:

• From Eclipse (with ADT), select Window > Android SDK Manager.
• On Windows, double-click the SDK Manager.exe file at the root of the Android SDK directory.
• On Mac or Linux, open a terminal and navigate to the tools/ directory in the Android SDK, then execute android sdk.

You can select which packages you want to download by toggling the checkboxes on the left, then click Install to install the selected packages.