我只是有这个问题为好。关闭并重新启动Android的工作室没有任何影响。

I just had this problem as well. Closing and re-launching Android Studio had no effect.

我的解决方案是执行以下命令在终端窗口：

The solution for me was to execute the following commands in a terminal window:

adb kill-server

adb start-server

在那之后，我的Andr​​oid设备连接正常。

After that, my Android device connected as normal.