Failed to resolve: com.android.support.constraint:constraint-layout

AS  build失败,
解决办法:
File> settings> Appearance & Behavior > System Settings > Android SDK
选择SDK Tools
选中Support Repository下的两项:
Constraintlayout for Android
Solver forConstraintLayout

如下图所示:
这里写图片描述

重启AS 即可解决!

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转载自blog.csdn.net/lmq121210/article/details/78180347