Kotlin on Android (en)
summary
Claims concise: Kotlin cuts Java boilerplate, compiles to JVM/class files and mixes incrementally with Java in the same Android project. Tooling: Android Studio/IntelliJ provides converter and refactorings. Safety and performance: lateinit/nullable types and safe-call/Elvis operators push NPEs to compile time and use annotations so there is no runtime wrapper overhead; ProGuard shrinks the small runtime. Android specifics: Kotlin Android Extensions generates cached view lookups and extension properties to avoid findViewById and a DSL for type‑safe layouts builds views programmatically; inline functions avoid lambda allocation.
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