你需要在设置中添加两个check in 打开
Settings
-> Appearance & Behavior -> System Settings -> Android SDK -> SDK Tools -> Appearance & Be
阅读背景：
Android Studio 中出现错误Failed to resolve: com.android.support.constraint:constraint-layout:1.0.2
来源：互联网
你需要在设置中添加两个check in 打开
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