Set up Android development environment

First, please follow this tutorial to install and configure Android Studio completely:

How to Set up an Android Development Environment

How to Set up an Android Development Environment. This wikiHow teaches you how to set up an Android software development program on your Windows or Mac computer. You'll use Android Studio, which is the official Integrated Development...

Then, in case you don't have an Android phone, you will need Genymotion as an emulator, please follow this tutorial carefully:

How to Use Genymotion Emulator with Android Studio

Genymotion emulator is one of the most used Android Studio plugins where you can deploy and test your mobile apps. Here, we have brought a step by step tutorial to download, setup, and use Genymotion with Android Studio. For your note, there is also a native emulator that you get as default with the Android Studio.