Android device does not show up in adb list [closed]

Question

Make sure your device is not connected as a media device.

I had a similar issue and solved with the following steps after connecting the device via USB:

1. turn on developer options on the android device.
2. enable check box for stay awake.
3. enable check box for USB debugging.
4. open cmd
5. got to platform tools adt tools here https://developer.android.com/studio.
6. adb kill-server
7. adb start-server
8. adb devices

Now we can see attached devices.

In Android 8 Oreo:

1. go into Settings / Developer Options / Select USB Configuration;
2. Select PTP (Picture Transfer Protocol).

Looks like the installed driver was in bad state. Here is what I did to make it work:

1. Delete the device from Device Manager.
2. Rescan for hardware changes.
3. List item "Slate 21" will show up with "Unknown driver" status.
4. Click on "Update Driver" and select /extras/google/usb_driver

Device Manager will find the driver and warn you about installing it. Select "Yes." This time the device got installed properly.

Note that I didn't have to modify winusb.inf file or update any other driver.

Hope this helps.

For me the solution was to use a different USB port on my laptop

While many of these solutions have worked for me in the past, they all failed me today on a Mac with a Samsung S7. After trying a few cables, someone suggested that the ADB connection requires an official Samsung cable to work. Indeed, when I used the Samsung cable, ADB worked just fine. I hope this helps someone else!

Disable and re-enable "use debug mode" on your telephone