React Native: Unable to emulate on Genymotion

Issue

I did following command to emulate my react native app on genymotion, but I got an error.

expo start -a

Here is the error.

This computer is not authorized to debug the device. Please follow the instructions here to enable USB debugging: https://developer.android.com/studio/run/device.html#developer-device-options. If you are using Genymotion go to Settings -> ADB, select "Use custom Android SDK tools", and point it at your Android SDK directory.

Solution

It seems like it might not have been able to find your adb path. You have to install adb and set adb path in genymotion and system.

Open genymotion and go to Settings > ADB tab, select "Use custom Android SDK tools", and point it to your Android SDK directory. And then please make sure that android sdk tools is in your system path.

set PATH=%PATH%;path\to\android\Sdk\platform-tools

Real example on windows, android sdk tools directory path depends on installation directory:

set PATH=%PATH%;C:\Users\<username>\AppData\Local\Android\Sdk\platform-tools

or

set PATH=%PATH%;C:\Program Files\android-sdk-windows\platform-tools

Answered By - mmatt