Ruby on Android
summary
Installs Android SDK first, then uses Roboto gem (a hacked JRuby) to generate an Android package; the gem can be installed on MRI and drives a bundled JRuby to build and test. Also shows mirro (a Mirah-like JVM-compiled Ruby) which needs light type hints but produces native-seeming activities. Demonstrates a generated Sudoku game and a homemade Guess My Number activity (code runs but no emulator demo available). Mentions an IRB app in the App Store.
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