examples/android/CHIPTest/app/src/main/res/layout/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/runButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="RunTest"
        tools:layout_editor_absoluteX="10dp"
        tools:layout_editor_absoluteY="10dp" />

    <TextView
        android:id="@+id/testLog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:scrollbars="vertical"
        android:paddingBottom="40dp"
        app:layout_constraintTop_toBottomOf="@+id/runButton"/>


</androidx.constraintlayout.widget.ConstraintLayout>