操作方法
首先检查一下你的SDK 是否安装了，如果没有安装SDK，请先安装！如果安装SDK之后用系统管理员的身份打开SDK Manager 看下是否安装了“Google USB Driver”
如果安装了“Google USB Driver”，还不能解决问题，则继续，右键我的电脑，选择到设备管理器，右键更新驱动，如图
选择 “Browse my computer for driver software”
Select “Let me pick from a list of device drivers on my computer”.
Select “Show All Devices”.
Press the “Have Disk” button.
Enter the path to the Google USB driver. Normally it is located in the following directory:
Select “Android ADB interface” from the list of device types.
等安装完之后 回到 android studio 运行，就可以解决问题了~~