Develop Android and backend applications with Kotlin. Covers implementing new features, reading and refactoring existing code, writing tests, and working with package managers, debugging tools and the ecosystem's tooling.Develop Android and backend applications with Kotlin. Covers implementing new features, reading and refactoring existing code, writing tests, and working with package managers, debugging tools and the ecosystem's tooling.Develop Android and backend applications with Kotlin. Covers implementing new features, reading and refactoring existing code, writing tests, and working with package managers, debugging tools and the ecosystem's tooling.