Android ADB devices unauthorized

Question

Configuration:

• Windows 8.1
• ADB version: 1.0.32
• Smartphone: Oneplus One

Problem

I installed the Samsung drivers as it is said to do. When I run the ADB devices command, it said unauthorized.

Already tried:

1. I've done everything that'd been said on this post: https://stackoverflow.com/a/25546300/1848376

   But the problem is that I don't get a prompt on the phone to tell me I must accept the connection.

2. When I run the command adb shell, here is the answer:

   error: device unauthorized.
   This adbd's $ADB_VENDOR_KEYS is not set; try 'adb kill-server' if that seems wrong.
   Otherwise check for a confirmation dialog on your device.
   

I did "adb kill-server", but it didn't change anything. Why?

Answer 1

I was hit by this problem, too. I'm using my custom build of AOSP on Nexus 5X. I've added a single line in build/core/main.mk:

diff --git a/core/main.mk b/core/main.mk
index a6f829ab6..555657539 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -362,6 +362,8 @@ else # !enable_target_debugging
   ADDITIONAL_DEFAULT_PROPERTIES += ro.debuggable=0
 endif # !enable_target_debugging

+ADDITIONAL_DEFAULT_PROPERTIES += ro.adb.secure=1
+
 ## eng ##

 ifeq ($(TARGET_BUILD_VARIANT),eng)

Now adb shell works fine

Those materials are useful (Chinese articles): http://www.voidcn.com/blog/kc58236582/article/p-6335996.html, http://blog.csdn.net/fanmengke_im/article/details/28389439

Answer 2

Thankgod xda developers exist : http://forum.xda-developers.com/verizon-lg-g3/help/unable-to-access-adb-t2830087

Just had to delete adbkey file in C:Users/$Name/.android adbkey.pub was missing.

Restart after this and both files are there.

If this does not work : - Try Revoke USB DEBUGGING Authorization. - Enable USB debugging again.

Answer 3

Try deleting the adbkey file from C/.android folder

and then run the commands as mentioned above i.e.

adb kill-server, adb start-server and adb devices

.

Answer 4

Ensure that you have accepted the pressed the "ok" button when it is asking it is showing the fingerprint of the device after connecting through usb to your PC.

Answer 5

I had the same problem after reinstalled my android studio. Here's what I did to make my adb work again:

-path to C:\Users\User\AppData\Local\Android\sdk\platform-tools
-Shift+r.click and start command from here instead.

Answer 6

in Developer options,

1. Enable USB debugging.

2. Give a authorization.

(if there is no a Developer option menu, you have to click 3 times build number of Phone State menu to be developer. you can sse a developer option menu.)