set height ImageView stetches image to fit width while maintaining aspect ratio. Centers the stretched image in the window of the ImageView.

banner_image_view.xml

<ImageView
            android:id="@+id/header_background"
            android:layout_width="match_parent"
            android:layout_height="48dp"
            android:layout_alignBottom="@+id/avatar"
            android:paddingTop="8dp"
            android:scaleType="centerCrop"
            android:cropToPadding="true"
            android:adjustViewBounds="true"
            android:src="@drawable/anonymous_image_2"
            android:contentDescription="user avatar" />