In order to build Android apps using Titanium, you first need to install the Android SDK. To download the Android SDK and review the installation documentation, visit http://developer.android.com/sdk/index.html.

After installing the Android SDK, you must set up the Android references in Titanium Studio and configure default emulators. For a step-by-step guide on how to set up Android in Titanium Studio visit http://developer.android.com/sdk/index.html.

For information regarding minimum supported SDK versions and overall compatibility, please visit http://docs.appcelerator.com/titanium/latest/#!/guide/Titanium_Compatibility_Matrix.