activity_main.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.cardview.widget.CardView
        android:id="@+id/cardView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:cardCornerRadius="75dp"
        app:cardUseCompatPadding="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <ImageView
            android:id="@+id/ivAvatar"
            android:layout_width="150dp"
            android:layout_height="150dp" />

    </androidx.cardview.widget.CardView>


    <androidx.cardview.widget.CardView
        android:id="@+id/btnShare"
        style="@style/ItemsTouchable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:cardBackgroundColor="@color/colorAccent"
        app:cardCornerRadius="16dp"
        app:cardUseCompatPadding="true"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/cardView">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginStart="22dp"
            android:layout_marginEnd="22dp"
            android:gravity="center_horizontal"
            android:padding="8dp"
            android:text="@string/contact_me"
            android:textColor="@android:color/white"
            android:textStyle="bold" />

    </androidx.cardview.widget.CardView>

</androidx.constraintlayout.widget.ConstraintLayout>