mMDT5_GreenWatch/app/src/main/res/layout/activity_connection.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    android:padding="10dp"
    tools:context=".ConnectionActivity">

    <TextView
        android:id="@+id/tvConnectionStatusmessage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Connection Activity">
    </TextView>

    <Button
        android:id="@+id/connectionBackToMainActivity"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Back to MainActivity">
    </Button>

</LinearLayout>