'Android Studio 'Loading Devices' unable to active

I am facing a problem, My android studio application. Loading Devices is disabling. I tried many ways to resolve that. but nothing didn't work.

-Create a New Project, Error didn't resolve.

-Restart the application even system also.

-Followed Previous posts :

Android Studio loading device button is disabled

Android studio virtual device not loading

Nothing Worked!!

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Solution 1:[1]

Restart the PC and then don't open Android Studio directly , but run it as Administrator , this can be some permission issue , you can also try File->Invalidate Cache & Restart !

Solution 2:[2]

Try to kill adb with adb kill-server in the terminal tab inside Android Studio. It will be restarted automatically. If this does not help try adb devices in the terminal to see if the device is at least listed in the terminal. If you are under Linux you also need special permissions to access USB.

Also you have to enable on the phone USB debugging and confirm the access from the PC in case you have not yet done so.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1
Solution 2