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Android Developers Blog: Say Goodbye to the Menu Button

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Google re-branded the support Android libraries to AndroidX

It is important to note, you cannot mix AppCompat and Jetpack in the same project. You must convert everything to use Jetpack if you want to upgrade. The support library artifacts are being deprecated and all future development is going into AndroidX , so there's no avoiding this migration. Alan Viverette sums this up nicely: “There won’t be a 29.0.0, so Android Q APIs will only be in AndroidX” The stable release of 28.0.0 will be the final feature release packaged as android.support . All subsequent feature releases will only be made available as androidx-packaged artifacts. Below tips will give you a clearer transition path. The current version of AppCompat (v28.x) is exactly the same as AndroidX (v1.x). In fact, the AppCompat libraries are machine generated by changing maven coordinates and package names of the AndroidX codebase. For example, android.support.v7.app.AppCompatActivity is now androidx.appcompat.app.AppCompatActivity For a complete listi...
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Android Beginners Guide

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Kotlin and Android

Kotlin is now an official language on Android. It's expressive, concise, and powerful. Best of all, it's interoperable with our existing Android languages and runtime. To use Kotlin in Android Studio prior to version 3.0 you have to manually install the Kotlin plugin. To do so, start Android Studio and open Plugins from the Configure menu . In the opened dialog, search for Kotlin , select the corresponding plugin and press Install . Kotlin for Android Development: Kotlin is a great fit for developing Android applications, bringing all of the advantages of a modern language to the Android platform without introducing any new restrictions. Compatibility: Kotlin is fully compatible with JDK 6, ensuring that Kotlin applications can run on older Android devices with no issues. The Kotlin tooling is fully supported in Android Studio and compatible with the Android build system. Performance: A Kotlin application runs as fast as an equivalent Java one, thanks to ver...
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