ImageView – have height match width?

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Updated July 28 2021 to use AndroidX instead of the support library

First, make sure your project has AndroidX imported, by following the directions here.

Then wrap your image inside a ConstraintLayout, and its fields as such:

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        app:layout_constraintDimensionRatio="1:1" />

</androidx.constraintlayout.widget.ConstraintLayout>

See here

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