activity_main.kt

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.motion.widget.MotionLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/motionLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/darker_gray"
    app:applyMotionScene="true"
    app:currentState="@id/start"
    app:layoutDescription="@xml/expandable_bottom_sheet_big"
    app:motionProgress="0"
    app:showPaths="true">

    <com.google.android.material.card.MaterialCardView
        android:id="@+id/card"
        android:layout_width="0dp"
        android:layout_height="0dp">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <ImageView
                android:id="@+id/arrow"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:src="@drawable/ic_arrow_upward_white_24dp" />

            <EditText
                android:id="@+id/editText"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="16dp"
                android:hint="Somehint"
                android:visibility="gone" />

        </RelativeLayout>

    </com.google.android.material.card.MaterialCardView>

</androidx.constraintlayout.motion.widget.MotionLayout>