- constraintlayoutを使用した時にたまに見るエラーメッセージ
- 「水平制約、垂直制約をつけてください」という意味
- 下記を追加してあげればOK
hoge.xml
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
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