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">

    <Button
        android:id="@+id/saveButton_public"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText_data"
        android:layout_alignParentEnd="true"
        android:layout_marginTop="44dp"
        android:onClick="savePublicly"
        android:padding="8dp"
        android:text="save public"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.516"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/saveButton_private" />

    <Button
        android:id="@+id/saveButton_private"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText_data"
        android:layout_alignParentStart="true"
        android:layout_marginTop="68dp"
        android:layout_toEndOf="@+id/saveButton_public"
        android:onClick="savePrivately"
        android:padding="8dp"
        android:text="save private"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_data" />

    <Button
        android:id="@+id/viewButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/saveButton_public"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="48dp"
        android:onClick="viewInformation"
        android:padding="8dp"
        android:text="view"
        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/saveButton_public"
        app:layout_constraintVertical_bias="0.0" />

    <EditText
        android:id="@+id/editText_data"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView_data"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="48dp"
        android:autofillHints=""
        android:hint="edit text data"
        android:inputType="textMultiLine"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView_data" />

    <TextView
        android:id="@+id/textView_data"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="44dp"
        android:text="text view data"
        android:textAllCaps="true"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.508"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>