PDK
http://pdk.android.com/online-pdk/guide/index.html
Android Platform Developer's Guide
Welcome to the Android Platform Dev Guide! This guide provides an under-the-hood introduction to the Android platform, and is designed for platform developers and manufacturers building Android-powered devices.
If you're a software developer interested in developing applications for Android, please visit the Android Developers site.
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こんなサイトがある。独自の証明書の作り方やビルド方法など面白い。