Android Studio 中出現錯誤Failed to resolve: com.android.support.constraint:constraint-layout:1.0.2

Android Studio 中出現錯誤 Failed to resolve:com.android.support.constraint:constraint-layout:1.0.2的解決辦法 你需要在設置中添加兩個check in 打開Settings -> Appearance & Behavior -> System Settings -> Android SDK -> SDK Tool
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