ConstraintLayout遇到的小錯誤

最新的Android Studio中創建的Activity默認使用約束佈局--------ConstraintLayout. 1) 在約束佈局中添加Button控件後,發現xml飄紅了! 如圖一所示: 2)報錯信息爲:"This view is not constrained, it only has designtime positions, so it will jump to (0,0)..

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