I've asked this on Stack Overflow, but so far no solution: http://stackoverflow.com/questions/36816530/why-does-adb-devices-show-unauthorized-with-no-allow-prompt-on-the-device
I've installed Android Studio 2.0 on my Windows 7 PC. This included the Android SDK. I've done Android development on this PC before using Eclipse + ADT and an earlier version of Android Studio, which worked (at that time). I've uninstalled the old version of Android Studio and installed the new (current) version. Also, based on the prerequisites for Android Studio, I've installed Java J2SE 1.8.0 update 92 (JDK). Now, when I attempt to connect to my phone (Samsung Galaxy S6) via USB, 'adb devices' shows 'unauthorized' and I never receive a prompt on the phone to allow USB debugging. I have USB configuration set to MTP and when I plug the phone into the USB cable, I get the auto-play prompt on the PC and I'm able to see device in Windows/Explorer and browse its directories, etc. I've uninstalled the OEM USB drivers for my device and re-installed them. I've turned USB Debugging off/on. I've Revoked USB debugging authorization under developer options on the phone, I've run 'adb kill-server' and 'adb start-server'. I've tried different USB cables and ports. I've restarted both the computer and the phone. I've verified there is only one instance of 'adb.exe' on the PC and that it is in the location identified by ANDROID_SDK_HOME ($ANDROID_SDK_HOME/platform-tools/adb.exe). There was a directory named .android in my $HOME directory which contained a lot of keys and configuration files, etc., so I uninstalled Android Studio again and manually moved that directory out of the way and then re-installed, but this didn't help. I'm wondering if there is a setting on the PC (or phone) which tells adb that we don't need to prompt to allow USB debugging which needs to be cleared? Can someone please help me? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/android-developers. To view this discussion on the web visit https://groups.google.com/d/msgid/android-developers/c7857fee-20c4-432e-a54e-ebb424ff6969%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
