摘要:Android Device Unauthorized
http://stackoverflow.com/questions/19485467/adb-wireless-device-unauthorized
From Android 4.2, every ADB device needs to be authorized for a computer to connect. This is done for security. So when a USB is connected a prompt comes asking to authorize the device when USB debugging is set. But does not happen for WIFI ADB.
So the workaround is to connect the device by USB, accepting the machine always. Then when the Wireless ADB is tried, it should work
簡單講就是4.2之後需要permision不然會出現offline然後不給連
這時候去開發者選項把usb連接關掉再打開
"手機"他就會問你要不要給權限
點ok就行了