A big summary of ADB devices offline problem

Encountered in the Doc dialog box ADB devices, has been shown that the device is in offline state, various post-search installation so-called:

1. Turn on USB debug mode
2. Close the third-party mobile assistant software
3. Restart the ADB service
ADB kill-server
ADB start-server

4. Check the SDK Manger to ensure that the SDK has been updated to require ADB version in 1.0.31 (dos in the ADB version to view ADB versions)

But still can't solve, helpless under I

5, in the phone settings click Revoke USB Debugging authorization, then reconnect the computer, re-authorize the computer OK!!!

If it doesn't work, then
6. Restart your phone
7. Restart your computer

Then repeat the steps above!

A big summary of ADB devices offline problem