row_poster.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 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"
    app:cardCornerRadius="4dp"
    android:layout_margin="4dp">

    <android.support.constraint.ConstraintLayout
        android:id="@+id/parentContsraint"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ImageView
            android:id="@+id/imgSource"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:scaleType="centerCrop"
            android:src="@drawable/placeholder"
            app:layout_constraintDimensionRatio="1:1"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/txtName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="4dp"
            android:layout_marginEnd="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="4dp"
            android:text="TextView"
            android:textColor="@android:color/black"
            android:textStyle="italic"
            android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/imgSource" />

    </android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>