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Recently, I had to add a perfect square CardView and I wanted to achieve this without hardcoding its width and height. I happily discovered the power of ConstraintLayout and this is how I managed to create a perfect square which should work on every dimension.
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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="wrap_content">
<androidx.cardview.widget.CardView
android:id="@+id/cardView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="8dp"
app:cardElevation="8dp"
app:contentPadding="16dp"
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">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center"
android:orientation="vertical">
<ImageView
android:id="@+id/category_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center" />
<TextView
android:id="@+id/category_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:gravity="center_horizontal"/>
</LinearLayout>
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>
In my project I created a RecyclerView with 2 columns, and this is how the result looks like.
The main attributes to achieve the square positioned like in the above image, were these:
- app:layout_constraintDimensionRatio=”1:1″
- wrap_content on the ConstraintLayout
- on the cardView the constraints are set to parent and the width and height to 0 (match_constraint)
Note: The red background is set on the recyclerView’s background.
