demo/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"
    android:background="#FFC107"
    android:scrollbars="horizontal|vertical"
    android:textAlignment="textStart"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <Button
                android:id="@+id/runStopButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Run" />

            <CheckBox
                android:id="@+id/debugMode"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Debug mode" />
        </LinearLayout>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:text="App output:" />

        <ScrollView
            android:id="@+id/scrollPayloadOutput"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <TextView
                android:id="@+id/payloadOutput"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="#9089e0"
                android:fontFamily="monospace"
                android:textColor="#000000" />
        </ScrollView>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:text="Console output:" />

        <ScrollView
            android:id="@+id/scrollConsoleOutput"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="2">

            <TextView
                android:id="@+id/consoleOutput"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="#FFEB3B"
                android:fontFamily="monospace"
                android:textColor="#000000" />
        </ScrollView>
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>