SDK location not found. Define location with an ANDROID_SDK_ROOT environment variable or by setting

SDK location not found. Define location with an ANDROID_SDK_ROOT environment variable 
or by setting the sdk.dir path in your project's local properties file at 
'D:\Andriod\senior\local.properties'.
根据它的意思是要创建系统变量ANDROID_SDK_ROOT，地址用它给出的地址
但问题往往不出在这里
我第一次出现问题是默认存放sdk的c盘满了
所以存在d盘
但是项目的local.properties里的sdk路径依旧是之前c盘的路径，把这个改一改就OK了