The Android API Browser provides a convenient UI for exploring the Android APIs across versions. The Android Open Source Project publishes an XML specification of the API each time they release a new version. I've taken the specifications for each API available and built a single database for use with this application. To use this application you will need to download the API database. The database is ~8MB and can be stored on either your internal or external storage. You will be prompted to download the database and notified when updates are available. The current database covers android-1 through android-14 (4.0). This application was developed in Ruby through the Ruboto project (JRuby on Android). For more information on Ruboto visit ruboto.org. Please email suggestions and feature requests toscott@rubyandroid.org. Known issues: - start up is slow - poor performance on 1st gen devices