Michael Fazio Kotlin and Android Develoment featuring Jetpack (Taschenbuch)
47,53 €
You can even handle asynchronous web service calls elegantly with Kotlin coroutines. It's a fake league but a real app, where you use what you learn in Penny Drop and build up from there. Also, a few examples require JDK 1.8 or later, though all of these pieces can be completed in other ways when using JDK 1.6.
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