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
If your device is not correctly detected in RAD Studio or in the system Device Manager, check the following: Ensure that your Android device is unlocked and not sleeping while connected via USB. Set the appropriate option in Settings or Developer Options. Make sure your Android device is enabled for USB debugging.
On Android 5.0, go to Settings -> Storage -> menu -> USB computer connection and make sure 'Media device (MTP)' is disabled. When it's disabled 'adb devices' lists the device, when enabled not.
Open a command window and enter "adb devices". Watch the device's screen for any Authorization message and allow the connection.
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
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