USB Debugging is not showing in ADB devices
I find solution for this problem..

steps:


Download Google USB Driver.
please find your device USB Driver from this link.
Then open devices in windows.
After that right-click on devices open property.
select update device driver.
Then select pickup from disk &amp; select path of download Google USB driver.
Then type into command prompt at android-sdk\platform-tools 
adb kill-server
adb start-server
adb devices

after all this you get your android devices.