mobile-android/app/src/main/res/layout/view_pin.xml

<?xml version="1.0" encoding="utf-8"?>
<merge 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"
    tools:layout_height="match_parent"
    tools:layout_width="match_parent"
    tools:parentTag="androidx.constraintlayout.widget.ConstraintLayout">

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/pin_1"
        style="@style/PinInput"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/keyline_7"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@+id/space_1"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number" />

    <Space
        android:id="@+id/space_1"
        android:layout_width="@dimen/keyline_2"
        android:layout_height="wrap_content"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toRightOf="@+id/pin_1"
        app:layout_constraintRight_toLeftOf="@+id/pin_2"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number" />

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/pin_2"
        style="@style/PinInput"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/keyline_7"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toRightOf="@+id/space_1"
        app:layout_constraintRight_toLeftOf="@+id/space_2"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number" />

    <Space
        android:id="@+id/space_2"
        android:layout_width="@dimen/keyline_2"
        android:layout_height="wrap_content"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toRightOf="@+id/pin_2"
        app:layout_constraintRight_toLeftOf="@+id/pin_3"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number" />

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/pin_3"
        style="@style/PinInput"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/keyline_7"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toRightOf="@+id/space_2"
        app:layout_constraintRight_toLeftOf="@+id/space_3"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number" />

    <Space
        android:id="@+id/space_3"
        android:layout_width="@dimen/keyline_2"
        android:layout_height="wrap_content"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toRightOf="@+id/pin_3"
        app:layout_constraintRight_toLeftOf="@+id/pin_4"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number" />

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/pin_4"
        style="@style/PinInput"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/keyline_7"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toRightOf="@+id/space_3"
        app:layout_constraintRight_toLeftOf="@+id/space_4"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number"
        />

    <Space
        android:id="@+id/space_4"
        android:layout_width="@dimen/keyline_2"
        android:layout_height="wrap_content"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toRightOf="@+id/pin_4"
        app:layout_constraintRight_toLeftOf="@+id/pin_5"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number" />

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/pin_5"
        style="@style/PinInput"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/keyline_7"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toRightOf="@+id/space_4"
        app:layout_constraintRight_toLeftOf="@+id/space_6"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number" />

    <Space
        android:id="@+id/space_6"
        android:layout_width="@dimen/keyline_2"
        android:layout_height="wrap_content"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toRightOf="@+id/pin_5"
        app:layout_constraintRight_toLeftOf="@+id/pin_6"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number" />

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/pin_6"
        style="@style/PinInput"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/keyline_7"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintLeft_toRightOf="@+id/space_6"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/enter_pin_wrong_number" />
</merge>