Android Studio No devices connected - android-studio

Running windows 7 and I have just downloaded the latest android studio version and started a project and now I'd like to test the application on my device but Android Studio says on the bottom left "No devices connected". I've tried a couple of things such as:
updating my Samsung S6 edge drivers through device manager, which were updated now.
have debugging mode turned on and USB debugging mode on.
ran 'adb devices' command to list devices but none show up.
downloaded new universal adb drivers.
toggled between MTP and PTP modes.
restarted computer/phone/android studio/ adb tens of times.
deleted phones drivers from device manager and installed again.
re-installed android studio.
probably some other small things too that I can't remember right now.
I'm at a loss as of right now, if someone can help me out I would really appreciate it!

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But I currently only have a Samsung Galaxy Note4, which is the version of Android 6.0.1.
How can I connect to Android Studio and run Android Apps on my Note4? Please provide some learning resources or support, thanks a lot !!
On the top right corner of Android Studio, you see this toggle list, and click on "Troubleshoot Device Connections".
Find "Troubleshoot Device Connection" on the top right corner toggle list
After that, follow the given steps to "Rescan Devices", and "Enable USB Debugging". Then you'll see your device appears in the toggle list. If not, press "Restart ADB(Android Debug Bridge) server" to find your device.
Steps provided by Troubleshoot Device Connection
Finally, press Finish to complete the task.
All in all, when I tried to find out how can I connect my old old version of the Android device to the AS, I got nothing on the internet. So I asked this question here, but eventually, I fix it on my own.
So I hope this question helps.

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Try reinstalling the android studio as it may be corrupted or change the device and see
Hope this works :)
It could be a number of different things that cause that error. Here are some troubleshooting steps to try:
Reboot the phone
Try a different USB cable, or unplug it and re-plug it back in
Use command line tools to relaunch adb if it gets hung up; try adb kill-server then adb start-server and then adb devices
Reset the USB debugging on the device in the settings; disable it and re-enable it
Try changing transfer modes in the USB debugging (i.e. camera PTP)
Close and restart Android Studio
Android studio emulators are still based on Intel Haxm virtualization software. I'm sure updates to AS are coming but for now you need to download a separate emulator to run an AVD (Android Virtual Device). It's pretty easy to download and install.
You can find it here: https://github.com/google/android-emulator-m1-preview

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do you checked the USB debugging checkbox ?
if not :
go to settings on the phone then to About device then tap on Build Number many times after that go back to settings you should find Developer options appeared tap on it then check USB debugging checkbox.
try this if not working tell me there is another things you can do

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I have always been able to get Android Studio to recognize my USB android devices in the past. However, this morning I upgraded to MacOS Sierra. Now, when I plug in an android device android studio doesn't see it. And my phone acts like it is plugged into a wall and not a computer. Usually, when I plug into a computer, I get the an option in the notification/dropdown menu to select a PTP or MTP connection. I am not getting that option.
I'm running Android Studio 2.2.3 and macOS Sierra v10.12 on a Macbook Pro.
I have tried different cables, different android devices, restarting my computer, still no dice.
If I run ./adb devices from the /Library/Android/sdk/platform-tools/ directory then I get nothing but List of devices attached with a blank line underneath.

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