android studio constraint layout proportional height
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:id="@+id/img_icon" android:layout_width="0dp" android:layout_height="0dp" android:background="@color/dark_red" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintDimensionRatio="1:1" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintWidth_percent="0.5" /> </android.support.constraint.ConstraintLayout>