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Kotlin is a novel language that represents an alternative to Java, and hasbeen recently adopted as a first-class programming language for Androidapplications. Kotlin is achieving a significant diffusion among developers, andseveral studies have highlighted various advantages of the language whencompared to Java.  The objective of this paper is to analyze a set of open-source Android apps,to evaluate their transition to the Kotlin programming language throughouttheir lifespan and understand whether the adoption of Kotlin has impacts on thesuccess of Android apps.  We mined all the projects from the F-Droid repository of Android open-sourceapplications, and we found the corresponding projects on the official GooglePlay Store and on the GitHub platform. We defined a set of eight metrics toquantify the relevance of Kotlin code in the latest update and through allreleases of an application. Then, we statistically analyzed the correlationbetween the presence of Kotlin code in a project and popularity metrics minedfrom the platforms where the apps were released.  Of a set of 1232 projects that were updated after October 2017, near 20%adopted Kotlin and about 12% had more Kotlin code than Java; most of theprojects that adopted Kotlin quickly transitioned from Java to the newlanguage. The projects featuring Kotlin had on average higher popularitymetrics; a statistically significant correlation has been found between thepresence of Kotlin and the number of stars on the GitHub repository.  The Kotlin language seems able to guarantee a seamless migration from Javafor Android developers. With an inspection on a large set of open-sourceAndroid apps, we observed that the adoption of the Kotlin language is rapid(when compared to the average lifespan of an Android project) and seems to comeat no cost in terms of popularity among the users and other developers.

Characterizing the transition to Kotlin of Android apps: a study on F-Droid, Play Store and GitHub