title: `adb devices` (not showing emulators) versus `emulator -list-avds` (returns emulators)
body: <p>What's the difference between listing your virtual devices with <code>adb devices</code> versus <code>emulator -list-avds</code>? For some reason my Android Virtual Device (AVD) isn't playing nice.</p>
  
  <p>When I run adb devices (<code>/Users/gui/Library/Android/sdk/platform-tools/adb devices</code>) the return is empty. However emulator -list-avds (<code>/Users/gui/Library/Android/sdk/tools/emulator -list-avds</code>) it lists my emulators:</p>
  
  <p><code>Nexus_5X_API_26_test
  Nexus_5X_API_26_x86
  Nexus_5X_API_27_x86
  </code></p>