Why does adb return offline after the device string?

Question

I use \"adb devices\" to get following result. Only one device is connected to PC by USB, but we get 8 lines of result.

Could anyone suggest the reason?

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Answer 1

Beginning from Android 4.2.2, you must confirm on your device that it is being attached to a trusted computer. It will work with adb version 1.0.31 and above.

Answer 2

For me with Android 4.1.1 only rebooting device works

Answer 3

Try the following:

1. Unplug the usb and plug it back again.

2. Go to the Settings -> Applications -> Development of your device and uncheck the USB debugging mode and then check it back again.

3. Restart the adb on your PC. adb kill-server and then adb start-server

4. Restart your device and try again.

Answer 4

I've had a similar issue with one of my phones. I was unable to connect and use usb debugging on any of my computers. In the end, I had to restart the usb debugging on the phone manually [doing so using the Developer menu was not enough].

There's only one command you have to run on your phone [I did it using Terminal Emulator app]:

adb usb

And that was it.

Hope this helps someone in the future.

Answer 5

also make sure adb isn't running in your processes automatically. If it's there right click open file location, figure out what is starting it, kill it with fire. Run the updated adb from an updated android sdk platform tools. This was the issue with mine, hope it helps someone.

Answer 6

Had this on client's machine it turned out he had an out of date version of adb installed via website offering adb and fastboot. The client in question didn't want to install the whole SDK because of perceived bloat :S .

So if you're seeing offline make sure you've downloaded and using the latest adb. I ended up emailing him adb executable.

Also worth checking that the adb you are using is the correct one in the Path. i.e on Mac

$ which adb
/Users/me/dev/adt-bundle-mac-x86_64/sdk-macosx/platform-tools/adb