Android Studio not connecting to devices

Issue

I am having an issue with Android Studio not connecting to any devices. This includes physical devices, as well as emulators. Everything was working, but I updated AS to the latest version, and now it is not working. The devices still show as connected when I use adb on the command line, so I am able to run commands through that. However, I can not run anything from Android Studio, or debug, or use logcat. What could possible be the issue where adb is connected to the devices, but Android Studio is not?

Even using the connection assistant shows that I have a pixel connected, but AS does not recognize it as an android device.

Solution

I'm running on a mac with Yosemite. I tried running old versions of Android Studio that were laying around which was a waste of time. So I got drastic.

This is a really bad solution, but has allowed me to actually get back to work.

1. Completely uninstall Android Studio and the Android SDK (the sdk might have been over-kill, but I'll let someone else figure that out). If you like, here's a website that helps uninstall AS. https://nektony.com/how-to/uninstall-android-studio-on-mac
2. Re-install Android Studio using an older version. I used 3.5.2 because I liked that color of green better than the new one. The link to find it: https://developer.android.com/studio/archive (you'll have to agree to their terms before being able to even look at the list!).
3. Run the newly-installed AS. Connect your device (remember to turn dev-mode!)...voila!

Well, it worked for me. And I only wasted 1 day.

Answered By - SMBiggs