Can't find android device using “adb devices” command

Question

I am developing Android application on macOS and my application runs well on the emulator. I want to run it on the device, but when I run adb dev

Answer 1

If using adb devices on Mac OS X no device is displayed and, of course, you have enabled the USB debugging on your device (see http://developer.android.com/tools/device.html), then try with:

$ android update adb
adb has been updated. You must restart adb with the following commands
    adb kill-server
    adb start-server

Then:

$ adb kill-server
$ adb start-server
* daemon not running. starting it now on port ... *
* daemon started successfully *

And finally:

$ adb devices
List of devices attached 
......  device

Your device should be now in the list.