You need add check in, open Settings -> Appearance & Behavior -> System Settings -> Android SDK -> SDK Tools
ok and add checks
- ConstraintLayout for Android
- Solver for ConstrainLayout
THEN here only you need close and open Android Studio.
Maybe only u can update to
compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha6'
本文介绍了解决Android Studio中出现的约束布局依赖问题的方法。通过设置中的SDK工具选项启用约束布局并更新依赖版本。
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