Develop Reference

pc is not asking debugging authorization permission in android

my PC model is dell inspiron n4110 running on windows 8.1 pro and my android is xiaomi redmi 4 running on android 7.0 . as i turned on settings related to debugging like developer options>usb debugging and then connected to my pc , still it doesn't ask for usb debugging permission when connected through usb cable

I am not on Windows machine right now so my answer might be a little vague.
These are the steps you can follow to recognise any device (Xiaomi, Samsung etc.) without installing specific drivers for each.
Make sure you have Android SDK installed and the Google USB driver is installed using SDK Manager -> SDK Tools.
Go to Control Panel -> Device Manager and right click on ADB interface and choose Update drivers.
Select Browse from computer and then select your SDK directory-> extras->google
After choosing the folder, click on Next and you should be able to see either ADB or Google USB in the next screen. You can select that and let the drivers install.
If Step 4 didn't work, you can choose Let me choose from installed.. after selecting the SDK folder
Reconnect your device and it should show the Allow USB debugging dialog.

Can't install Google USB drivers for Kazam 348 on WIndows 10

I tried to install the Google USB drivers needed for Android development on my Windows 10 PC. But for some unknown reason it fails.
The phone (Kazam Tornado 348)ships with an option to enable the phone as a virtual CD ROM. When I do so I can se an "Install" file that should install the needed drivers. However they fail without any further details.
I then wrote a mail to Kazam and asked the for new drivers - however they say that they do NOT have any drivers and I should ask Google !!!!! Funny !
On Googles development site I downloaded the "generic" USB drivers. They install but I can't update my Tornado 348 driver through the device manager. It simply says that no valid drivers was found.
I also looked through the list of OEM suppliers - but Kazam is no listed.
One final notice - I can see that the drivers supplied on the Virtual CD ROM is from Media Tek. Also think they supplied the CPU in the phone. But searching their homepage for a driver not give me any result.
Anyone else out there with a Kazam Tornado 348 that is working in Windows 10?
The USB actually work - but is marked with a yellow exclamation mark. So I can see the phone in the file explorer. But in the device manager I can see that there is a problem - and also in Visual Studio it will not show as a device I can use for testing my code.

BLU VIVO AIR had same issue.
Use a USB cable to connect the Windows PC and your phone . Open up Device manager. You'll see the your phone show up in "Other Devices" as unavailable.
Download and install the Google Generic USB Driver from http://developer.android.com/sdk/win-usb.html#top . Note down and remember the location where you install the google driver to.
Right mouse your phone select Update Driver Software…
Select "Browse for driver software on your computer"
Navigate to where you installed the Google USB Driver software
Select "Let me pick from a list of device drivers on my computer"
Select "Show all devices"
Select "Have Disk"
Navigate to where you installed the Google USB driver, select the android_winusb.inf file
In the Update Driver Software - YOUR PHONE dialog select "Android ADB Interface"
Ignore the "Update Driver Warning" message.
You will now see the Android Device -> Android ADB Interface in Device Manager, and VIVO AIR will be gone from "Other Devices". You should now also be able to turn on things like USB/Mass Storage Mode on the phone so you can view files from Windows Explorer as well as debug to the device.
I blogged about getting the generic google usb driver to install here with step by step and no funny links or ads - http://www.devfish.net/post/2015/07/20/android-usb-adb-drivers-for-blu-phones-vivo-air.aspx .

Android Studio Doesn't recognize my device- one plus one

I activated Developer Options" and check "USB debugging". I installed google usb driver on sdk.
But still Android studio doesn't recognize my mobile (one plus one).
I tested my mobile on my friend's laptop, it works. Also my android studio recognises Samsung when I install drivers.
But it doesn't recognize one plus one and nexsus.
Do you have any suggestion?

As I said in comment above, when I wanted to debug my app with my OPO today I got the same problem, after moving around to figuring it out, I found out it was because of ADB Driver (which for some unknown reasons got uninstalled from my system).
At first, check you Device Manager, if you see a yellow mark beside your phone, it is absolutely because of ADB Driver, so follow the steps below to install it:
Install the latest Samsung drivers: SAMSUNG USB Driver v1.5.33.0
Restart the computer (very important)
Go to Device Manager, find the Android device, and select Update Driver Software.
Select Browse my computer for driver software
Select Let me pick from a list of device drivers on my computer
Select ADB Interface from the list
Select SAMSUNG Android ADB Interface (this is a signed driver). If you get a warning, select Yes to continue.
Done!
Hope it will help you.
More on this

-Enable developer mode and usb debugging on OPO
-Open Android SDK manager either from Android Studio or the directory the SDK is saved in. 
-Tick Google USB Driver and click ok to download
-Connect OPO
-Open Device Manager
-OPO should show as unknown device
-Right Click on it
-Update or install driver
-Select from list
-Android ADB Interface
-Click ok

Information from this link OnePlusOne helped me to resolve the Chrome://inspect device not detected - Authorize popup prompt issue
Phone: One Plus One
OS: Cyanogen Version 13.1.2
Content from the link is added here :
Quick guide:
Pre-requisite : Download Google USB Driver from here
Connect your device with Android Debugging enabled to your PC
Open Device Manager of Windows from System Properties.
Your device should appear under 'Other devices' listed as something like 'Android ADB Interface' or 'Android Phone' or similar.
Right click that and click on 'Update Driver Software...'
Select 'Browse my computer for driver software'
Select 'Let me pick from a list of device drivers on my computer'
Double-click 'Show all devices'
Press the 'Have disk' button
Browse and navigate to [wherever you have extracted the downloaded file]\google-usb_driver and select android_winusb.inf
Select 'Android ADB Interface' from the list of device types.
Press the 'Yes' button
Press the 'Install' button
Press the 'Close' button
Now you've got the ADB driver set up correctly. Reconnect your device if it doesn't recognize it already.

For One Plus Phones, here is what I did and it worked. I use a One Plus 7T Pro. Before you begin, ensure Android Studio is up and running.
Go to Settings > System > Developer options.
Under Debugging, Tap on Revoke USB debugging authorisations and Tap on Ok when prompted
Switch Off the Developer Mode and Switch it back On
Switch On the Stay Awake option (if you need it)
Under Debugging, Switch On USB debugging option
Remove the USB cable from your device and reinsert it. On the device, you will be prompted to Allow USB debugging for your device ID. Tap on Allow
You should now be able to see the device detected in Android Studio.
This should work for all devices of different brands that are not automatically recognised in Android Studio.

For me the issue was in wrong USB file type transfer "Default USB configuration" option.
It was set to "No data transfer" and I needed to set it to "PTP" under

For me it was much simpler then that:
Under Developer Options
Enable developer mode and usb debugging
Under Debugging subcategory
Enable Android debugging
And my device showed right up on Android Studio 2.2 deployment target dialog.
** Android version 6.0.1
** Cyanogen OS Version 13.1.2

The previous answers didn't work for me. But following the advice from here helped me resolve the issue.
I have provided the steps I followed, but they have been lifted stright from the above link and all credit goes to them. There were a couple of deviations I had to take to make it work which were:
step 9 showed ADB device which I clicked
step 13 shows ADB didnt work but device mamanger now picks up the device and so does VS
Setup ADB & Fastboot Drivers
Step 1. To get started, download the 15-second adb/fastboot installer here and run the file on your windows desktop.
Step 2. Press Y/Yes to install ADB and Fastboot drivers and follow all the steps to continue the driver installation. Once completed you will see fastboot/adb folder on your C drive (C:\adb).
ADB-Installer
Step 3. Now the Files are installed on your desktop, next step is to configure them and setup the drivers.
Step 4. Pick your phone up and go to Settings > About Phone and tap on Build Number 7 times until you’ve enabled Developer Options, then go back to the main settings menu and go to Developer Options that magically appeared right above About Phone. And Enable Android Debugging / USB Debugging mode.
Step 5. Now connect your phone to the PC with USB cable and open Device Manager and look for your phone. It will show up under Portable Devices as your phone model number or Other Devices or ADB Interface or Android. See the screenshot below:-
ADB-Interface
Step 6. Right-click on it and select update driver software.
Update-Driver-Software
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Step 7. Now new popup windows will appear on your screen. From here click on the “Browse my computer for driver software”
Browse-Computer-For-Drivers
Step 8. Now from the next screen click on the “Let me pick from a list of device drivers on my computer” and hit the next button.
Let-Me-Picks-Drivers
Step 9. From the next screen click on the “Android Device” option and hit the next button to proceed.
Android-devices
Step 10. Now on the next screen you will see all the ADB drivers that are installed on your windows. Here select the “Android ADB Interface” and click on the next button to complete the setup process.
ADB-Drivers-Setup
Step 11. ADB Drivers are now properly installed. To check it is working or note. Go to the ADB folder on your C Drive which the installer created on Step 2.
Step 12. Connect your phone to the PC and open a command window in your fastboot/adb folder (C:\adb). To do this Hold Shift button on your keyboard and right-click on the empty space of the folder. See the screenshot:-
ADB-FIles
Step 13. Now the command prompt windows will appear on your desktop. And enter the following command and you will see the screen with a list of devices attached. This means the drivers are properly installed and your android is successfully connected to the window PC.
adb devices

Eclipse & adb Not Recognizing Glass as Running Android Device

So I have a physical Google Glass device attached to my laptop running Windows 8. In Windows Explorer it shows an attached 'Glass 1' device. However when I run a Hello Glass test project in the 'Android Device Chooser' in Eclipse there are no selectable running Android devices. Similarly when I run adb through command prompt, 'adb devices' brings up an empty list of attached devices.
What is the issue here and how can I get Eclipse/adb to see the Glass device?

I've been through this very issue multiple times over the last few days (doing some Glass dev work for my company). What you're going to want to do is this:
If you haven't yet, install the Google USB Driver package from the Android SDK manager.
Open the Device Manager, find the device that's showing up as Glass 1, right click, select "Update Driver Software..."
Browse for the drivers, navigate to [Android install folder]\android-sdk\extras\google\usb_driver, click next.
Let it install the drivers. If the device is now showing up as "Android Composite ADB Interface", you're good to go and it should appear in adb (assuming you enabled debug on the device itself). If it's just showing up as "Android ADB Interface" without the "Composite", uninstall the drivers, making sure to check the "Delete the driver software..." checkbox, unplug/replug the device, and go back to step 2.
Disclaimer: I've done all my dev work on Windows 7, so this may not be 100% accurate for Windows 8.

I struggled for quite a few hours getting Glass recognized by adb in Windows 7. The two answers above contain essential info, but for me one additional step was necessary:
turn off automatic driver installation in Windows
Computer -> Properties -> Advanced system settings -> Hardware -> Device Installation Settings -> "Do you want Windows to download driver software and realistic icons for your devices?" -> "No, let me choose what to do" -> "Never install driver software from Windows Update"
Then, delete the existing driver and reinstall from the adk directory as above. Before I had changed the driver installation setting, Windows had been installing its idea of the "best driver" as soon as the device was connected and refusing to replace when I attempted to update with the real Google driver.
You're on the right track if Glass shows up under "Other devices" after removing the existing driver, and if it shows as "Android Composite ADB Interface" after installing from the android sdk extras directory. Good luck.

Unable to install the Android USB driver on Windows 7

So I want to use my new Nexus 5 for debugging my apps.I tried to install the Android USB driver via the device manager
But my nexus is listed as portable device and uses the default windows driver.How can I replace the windows MTP-USB driver with the android driver?When I click update driver software und select "\sdk\extras\google\usb_driver", it tells me that the driver software is up-to-date.
Edit:
USB Debugging is already activated
Edit 2:
Sorry my fault there are actually two Nexus 5 in my Device Manager. The other one accepted the android driver.

First you'd want to make sure you device is in 'debug mode' or 'usb debugging' - set through development settings in your phone's 'system settings'
then run adb devices from your adt-bundle folder/platform-tools to see if it got your device.
Edit:
if it doesn't work try, from your 'drivers' tab-
Update Driver -> Browse for driver software on my computer -> Let me pick from a list of device drivers from my computer -> Have Disk -> Navigate to your usb_driver folder
Notice the extra step near the end, you don't submit the folder in the "Browse for driver software on my computer" tab

download this usb driver: http://dlcdnet.asus.com/pub/ASUS/EeePAD/nexus7/usb_driver_r06_windows.zip
go to the device manager , right click the nexus device and choose properties, choose "hardware" and then choose update your driver , choose manualy and pick the folder you opend the zip file to and press apply.
open your setting in nexus . go to : "about the device" , at to the bottom of the page and press it strong text7 times .
open the developers menu and enable debug with usb.
finally press storage from the setting menu and click the menu that apears at the top left corner. press the connect usb to the computer, choose the second option (PTP).
that should do the trick.

The way I got the drivers installed for my nexus 5 was by following these instructions but I had to turn off my phone and do the steps below but for following the first set of instructions for the link below:Nexus 5 Driver installation instructions
power off your phone.
press and hold Volume Down and Power buttons simultaneously
- an Android robot will show up and the Fastboot Mode text is listed.
connect the Nexus 5 to your PC via USB Cable.
After doing this the drivers installed but had a yell warning sign. However I was still able to get it to take commands and for it to be seen by the ADB devices command. I currently am using windows 7, and I have the adb setup in my environment variables so I can run commands from the command line.
In the command line before you call the adb devices, make sure you navigate to the android platform tools folder '\Android\android-studio\sdk\platform-tools then from here call the adb devices and you will know for sure if your device is being detected!

Just to highlight the key step that solved the problem for me using a Nexus 5.
Follow the steps by Neeraj, just replacing the first one by the drivers in http://developer.android.com/sdk/win-usb.html
Key point is to make sure you change the usb connection to use PTP and try to install the driver from the Nexus 5 under other devices.
That solved the issue for me.

Another related issue:
Every time you connect a device through USB 3.0, Windows 7 automatically installs its own drivers that can't be updated. Removing them does nothing, as they will just be immediately installed again upon reconnection.
To get get around this, you need just need to use a USB 2.0 slot.

To allow usb debugging for an lg f60 d390 in Android Studio I had to install LG PC Suit.

I had same issue, Uninstall the existing driver. Then your device will be listed under Android Device -> Composite ADB interface in device manager. You then can follow steps to update the Google - USB driver.

This answer worked for me.
Switch the USB port you use.
For whatever reason once I did this Windows recognized my device.