android - ImageView - have height match width?

Question

I have an imageview. I want its width to be fill_parent. I want its height to be whatever the width ends up being. For example:

<ImageView
  android:layout_width="fill_parent"
  android:layout_height="whatever the width ends up being" />

Is something like that possible in a layout file without having to create my own view class?

Thanks

Answer 1

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