Android Studio device dropdown stuck on "Loading..."
Solution 1:
Try reinstalling Flutter and/or resetting the Flutter SDK path under "File > Settings > Languages and Frameworks > Flutter".
Solution 2:
I spend time on this issue i got solution
Delete platform-tools
C:\Users\ (computer name)\AppData\Local\Android\Sdk
from this path
And download new Platform Tools from this site https://developer.android.com/studio/releases/platform-tools
then unzip and paste it on this location
C:\Users\ (computer name)\AppData\Local\Android\Sdk
Solution 3:
File -> Invalidate Caches / Restart and click Invalidate and Restart fixed it.