My Samsung phone was not recognized by Android Studio on windows 7. I repaired it by installing the Samung Driver here:
http://developer.samsung.com/technical-doc/view.do?v=T000000117
I tested with my Galaxy S2 and the Samsung S7560 and it works now
I had the same issue when connecting a SM-T113 to a Windows 7 PC. The problem was solved by installing Smart Switch.
Here are few steps if your android phone create problem next time
- Make sure developer mode is enable
- Make sure Android studio is up to date
- Make sure Android Phone is also up to date
Galaxy J7(2016) same problem solved
when i go to software update section on phone.
asked me to allow debug mode from this computer . Checked always trust this computer. and OK
Note : Usb mode PTP
I solved in following way:
Go to Settings->Developer options-> On top of the screen, turn on the button.
Now goto bottom on the debugging section.
Now turn on USB debugging option
It will ask some questions if you want to allow the PC to this device, press allow all time!