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Failed to sync Gradle project ‘项目名称（module）’ Error:failed to find Build Tools revision 20.0.0

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Android studio 错误提示：

Failed to sync Gradle project ‘My Application’

Error:failed to find Build Tools revision 20.0.0

错误原因;

项目中设置的BuilTools版本与项目关联的SDK中的BuilTool版本对不上，这种情况很可能是

1.由于你用以前的IDE工作新建一个项目，现在使用新的IDE工具导进项目

2.电脑中有两套或者以上SDK，在Android Studio中切换SDK路径

解决办法：

第一种办法：查找SDK安装目录\build-tools 下查看自己的BuildTools 版本，然后修改项目为该版本，问题解决，见下图：

第二种办法：用SDK Manager下载该项目所需要的BuildTools版本，然后用代码关联，

这是Goole Android官网中提到的办法（不会访问Google的小伙伴不要使用这种办法）

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