MainActivity.xml(old)

<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#97C3E7"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="407dp"
        android:layout_height="108dp"
        android:shadowColor="#2E2D2D"
        android:shadowRadius="10"
        android:text="0"
        android:textAlignment="center"
        android:textColor="#4D4D4D"
        android:textSize="100sp"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.171" />

    <Button
        android:id="@+id/button"
        android:layout_width="267dp"
        android:layout_height="212dp"
        android:background="#00FFFFFF"
        android:onClick="clicko"
        android:text="@string/buttont"
        android:textSize="150sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.645" />

    <Button
        android:id="@+id/button2"
        android:layout_width="289dp"
        android:layout_height="74dp"
        android:backgroundTint="#FFE96B"
        android:onClick="buy"
        android:text="@string/shop"
        android:textColor="#4E4E4E"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.951" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:backgroundTint="#FFE96B"
        android:text="Отчистить"
        android:textColor="#4E4E4E"
        android:onClick="clear"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.046" />


</androidx.constraintlayout.widget.ConstraintLayout>