No android device found in unity

Question

When I am building a game for android, I get this message:

No Android device found! Make sure USB debugging has been enabled. Check your device. I

Answer 1

For me, the device was working just fine, but once while unity was building up the editor froze and I had to kill the unity editor, and when I started it again unity couldn't recognize the device, and so after hours of struggling I finally find the solution.

first, identify the adb status of your device go to the Android SDK path on your computer and under platform-tools open the cdm

and type the following

adb devices

for me, my device is there but its state is, unauthorized. and so the solution was to authorize it again, there are many ways to do it:

1- try to switch the USB debugging option on and off under Developer options/Debugging also, try to Revoke USB debugging authorizations.

the goal is to make the "authorize this computer" popup appear to update the status. however; this didn't work for me the popup didn't appear, the solution to forcing the popup to show is as follow:

2- go again to platform-tools and open the cmd

type

where adb

Identify all the duplicate entries in the path. Remove duplicates.

Now do

adb kill-server 

then

adb start-server

the popup should now appear, and the status of the device should be authorized.

credit to @user6123723