title: Why React-Native Couldn't start project on Android connection with Expo?
body: <p>Couldn't start project on Android.</p>
  <p>Error : No Android connected device found, and no emulators could be started automatically.</p>
  <p>Please connect a device or create an emulator (<a href="https://docs.expo.io/workflow/android-studio-emulator" rel="nofollow noreferrer">https://docs.expo.io/workflow/android-studio-emulator</a>).</p>
  <p>Then follow the instructions here to enable USB debugging:</p>
  <p><a href="https://developer.android.com/studio/run/device.html#developer-device-options" rel="nofollow noreferrer">https://developer.android.com/studio/run/device.html#developer-device-options</a>. If you are using Genymotion go to Settings -&gt; ADB, select &quot;Use custom Android SDK tools&quot;, and point it at your Android SDK directory.</p>