arcanechat-android/res/layout/setup_code_grid.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- the FrameLayout is needed as View.inflate() without a root discards all layout_-attributes -->

    <GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginTop="16dp"
                android:layout_marginLeft="24dp"
                android:layout_marginStart="24dp"
                android:layout_marginRight="24dp"
                android:layout_marginEnd="24dp"
                android:columnCount="6"
                android:rowCount="1">

        <!-- 1st row -->

        <EditText
            android:id="@+id/setupCode0"
            android:layout_marginBottom="8dp"
            android:layout_width="wrap_content"
            android:inputType="numberDecimal"
            android:maxLength="4"
            android:minEms="3"/>

        <TextView
            android:layout_marginBottom="8dp"
            android:text=" - "
            android:textAppearance="@style/TextAppearance.AppCompat"/>

        <EditText
            android:id="@+id/setupCode1"
            android:layout_marginBottom="8dp"
            android:layout_width="wrap_content"
            android:inputType="numberDecimal"
            android:maxLength="4"
            android:minEms="3"/>

        <TextView
            android:text=" - "
            android:textAppearance="@style/TextAppearance.AppCompat"/>

        <EditText
            android:id="@+id/setupCode2"
            android:layout_marginBottom="8dp"
            android:layout_width="wrap_content"
            android:inputType="numberDecimal"
            android:maxLength="4"
            android:minEms="3"/>

        <TextView
            android:layout_marginBottom="8dp"
            android:text=" - "
            android:textAppearance="@style/TextAppearance.AppCompat"/>

        <!-- 2nd row -->

        <EditText
            android:id="@+id/setupCode3"
            android:layout_marginBottom="8dp"
            android:layout_width="wrap_content"
            android:inputType="numberDecimal"
            android:maxLength="4"
            android:minEms="3"/>

        <TextView
            android:layout_marginBottom="8dp"
            android:text=" - "
            android:textAppearance="@style/TextAppearance.AppCompat"/>

        <EditText
            android:id="@+id/setupCode4"
            android:layout_marginBottom="8dp"
            android:layout_width="wrap_content"
            android:inputType="numberDecimal"
            android:maxLength="4"
            android:minEms="3"/>

        <TextView
            android:layout_marginBottom="8dp"
            android:text=" - "
            android:textAppearance="@style/TextAppearance.AppCompat"/>

        <EditText
            android:id="@+id/setupCode5"
            android:layout_marginBottom="8dp"
            android:layout_width="wrap_content"
            android:inputType="numberDecimal"
            android:maxLength="4"
            android:minEms="3"/>

        <TextView
            android:text=" - "
            android:textAppearance="@style/TextAppearance.AppCompat"/>

        <!-- 3rd row -->

        <EditText
            android:id="@+id/setupCode6"
            android:layout_marginBottom="8dp"
            android:layout_width="wrap_content"
            android:inputType="numberDecimal"
            android:maxLength="4"
            android:minEms="3"/>

        <TextView
            android:text=" - "
            android:layout_marginBottom="8dp"
            android:textAppearance="@style/TextAppearance.AppCompat"/>

        <EditText
            android:id="@+id/setupCode7"
            android:layout_marginBottom="8dp"
            android:layout_width="wrap_content"
            android:inputType="numberDecimal"
            android:maxLength="4"
            android:minEms="3"/>

        <TextView
            android:text=" - "
            android:layout_marginBottom="8dp"
            android:textAppearance="@style/TextAppearance.AppCompat"/>

        <EditText
            android:id="@+id/setupCode8"
            android:layout_marginBottom="8dp"
            android:layout_width="wrap_content"
            android:inputType="numberDecimal"
            android:maxLength="4"
            android:minEms="3"/>

        <TextView
            android:text=" "
            android:layout_marginBottom="8dp"
            android:textAppearance="@style/TextAppearance.AppCompat"/>

    </GridLayout>

</FrameLayout>