Add custom target to Android SDK and AVD Manager

From the Android SDK and AVD Manager it is possible to add an extra Add-on Site URL.

I'd like to hav开发者_JAVA百科e some starting point or documentation about developing and distributing add-ons so I can distribute an SDK for my own target device.

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I found a similar question that directed me to the platform/vendor/samples folder of the Android source. The samples folder also contains some documentation.