How to enable Android Virtual Devices (AVD)

Issue

I am starting to learn react-native but upon installation of Android-Studio I couldn't get the AVD button to be clickable (enable). As showned below the icon next (right) to the down-arrow icon is gey out. I needed to open the AVD in order to successfully run react-native run-android

Solution

In your screen there is error described: you don't have Build Tools. Click on the blue link "Install Build Tools 26.0.2 and sync project".

Then go to Tools -> Android -> AVD Manager and click icon "+Create Virtual Device" (icon in lower left part of dialog window). On the next screens you will configure your VD (system, parameters) and you will have to download system image. It must be downloaded and selected to create Virtual Device. After that your VD should be accessible either by icon in main window or by list in Tools -> Android -> AVD Manager.

Answered By - deevee