Papers › An Empirical Study on Quality of Android Applications written in Kotlin language
An Empirical Study on Quality of Android Applications written in Kotlin language
Bruno Gois Mateus, Matias Martinez
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Context: During the last years, developers of mobile applications have the possibility to use new paradigms and tools for developing mobile applications. For instance, since 2017 Android developers have the official support to write Android applications using Kotlin language. Kotlin is programming language fully interoperable with Java that combines object-oriented and functional features. Objective: The goal of this paper is twofold. First, it aims to study the degree of adoption of Kotlin language on development of open-source Android applications and to measure the amount of Kotlin code inside Android applications. Secondly, it aims to measure the quality of Android applications that are written using Kotlin and to compare it with the quality of Android applications written using Java. Method: We first defined a method to detect Kotlin applications from a dataset of open-source Android applications. Then, we analyzed those applications to detect instances of code smells and computed an estimation of quality of the applications. Finally, we studied how the introduction of Kotlin code impacts on the quality of an Android application. Results: Our experiment found that 11.26% of applications from a dataset with 2,167 open-source applications have been written (partially or fully) using Kotlin language. We found that the introduction of Kotlin code increases the quality (in terms of presence of code smells) of the majority of the Android applications initially written in Java.
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