約束佈局ConstraintLayout ，報錯：This view is not constrained vertically

This view is not constrained vertically: at runtime it will jump to the left unless you add a vertic 解決方案：  1.切換xml到design試圖下  2.選中ConstraintLayout右鍵選擇Constraint Layout中的Infer Constraints \ 原因：要兩個方向纔可

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