I assume you are saying you are not getting devices in the list. And with this assumption, I would say it's due to adb
issues.
Try killing and restarting adb:
Above command will kill the adb
services and then start it again.
Android Studio makes a lot of files as caches and does not delete them. This can cause trouble when there is a need to make new files, so clearing caches will clear the old cache and make Android Studio faster. Go to File --> and click invalidate catches/restart
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