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.recyclerview.widget.RecyclerView
        android:id="@+id/rvTodos"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.appcompat.widget.LinearLayoutCompat
        android:id="@+id/linearLayoutCompat"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:weightSum="3"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent">

        <androidx.appcompat.widget.AppCompatEditText
            android:id="@+id/etTodo"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginHorizontal="8dp"
            android:layout_weight="2"
            android:hint="@string/enter_todo_text"
            android:inputType="textCapSentences"
            tools:ignore="TextContrastCheck" />

        <Button
            android:id="@+id/btnAddTodo"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginHorizontal="8dp"
            android:layout_weight="1"
            android:text="@string/add" />
    </androidx.appcompat.widget.LinearLayoutCompat>

    <TextView
        android:id="@+id/textView"
        android:layout_width="294dp"
        android:layout_height="165dp"
        android:gravity="center"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.433" />

</androidx.constraintlayout.widget.ConstraintLayout>