activity_num_table.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".NumTable">

  <TextView
      android:id="@+id/textNumTable"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_marginStart="32dp"
      android:text="Numéro de table"
      android:textSize="16sp"
      app:layout_constraintBottom_toTopOf="@+id/btnValider"
      app:layout_constraintEnd_toStartOf="@+id/tableNumInput"
      app:layout_constraintStart_toStartOf="parent"
      app:layout_constraintTop_toTopOf="parent" />

  <EditText
      android:id="@+id/tableNumInput"
      android:layout_width="0dp"
      android:layout_height="wrap_content"
      android:layout_marginEnd="32dp"
      android:ems="10"
      android:inputType="number"
      app:layout_constraintBottom_toTopOf="@+id/btnValider"
      app:layout_constraintEnd_toEndOf="parent"
      app:layout_constraintStart_toEndOf="@+id/textNumTable"
      app:layout_constraintTop_toTopOf="parent" />

  <Button
      android:id="@+id/btnValider"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Button"
      app:layout_constraintBottom_toBottomOf="parent"
      app:layout_constraintEnd_toEndOf="parent"
      app:layout_constraintHorizontal_bias="0.498"
      app:layout_constraintStart_toStartOf="parent"
      app:layout_constraintTop_toBottomOf="@+id/tableNumInput" />

</androidx.constraintlayout.widget.ConstraintLayout>