Signal-Android/app/src/main/res/layout/create_payment_fragment.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">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/create_payment_fragment_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        app:layout_constraintTop_toTopOf="parent"
        app:navigationIcon="@drawable/ic_arrow_left_24" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fadeScrollbars="false"
        android:fillViewport="true">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/create_payment_fragment_constraint_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/create_payment_fragment_balance"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginBottom="24dp"
                android:textColor="@color/signal_text_secondary"
                android:textSize="16sp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                tools:text="684.924 MOB available" />

            <com.google.android.material.button.MaterialButton
                android:id="@+id/create_payment_fragment_request"
                style="@style/Signal.Widget.Button.Large.Primary"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="48dp"
                android:layout_marginBottom="24dp"
                android:text="@string/CreatePaymentFragment__request"
                android:visibility="gone"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_balance"
                app:layout_constraintEnd_toStartOf="@id/create_payment_fragment_pay"
                app:layout_constraintStart_toStartOf="parent" />

            <com.google.android.material.button.MaterialButton
                android:id="@+id/create_payment_fragment_pay"
                style="@style/Signal.Widget.Button.Large.Primary"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="12dp"
                android:layout_marginEnd="48dp"
                android:layout_marginBottom="24dp"
                android:text="@string/CreatePaymentFragment__pay"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_balance"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/create_payment_fragment_request"
                app:layout_goneMarginStart="48dp" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_decimal"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:layout_marginBottom="@dimen/create_payment_key_bottom_row_margin_bottom"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__decimal"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_bottom_controls"
                app:layout_constraintEnd_toStartOf="@id/create_payment_fragment_keyboard_0"
                app:layout_constraintStart_toStartOf="parent" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_0"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:layout_marginBottom="@dimen/create_payment_key_bottom_row_margin_bottom"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__0"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_bottom_controls"
                app:layout_constraintEnd_toStartOf="@id/create_payment_fragment_keyboard_lt"
                app:layout_constraintStart_toEndOf="@id/create_payment_fragment_keyboard_decimal" />

            <ImageView
                android:id="@+id/create_payment_fragment_keyboard_lt"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:layout_marginBottom="@dimen/create_payment_key_bottom_row_margin_bottom"
                android:background="?attr/selectableItemBackground"
                android:contentDescription="@string/CreatePaymentFragment__backspace"
                android:gravity="center"
                android:padding="14dp"
                android:scaleType="centerInside"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_bottom_controls"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/create_payment_fragment_keyboard_0"
                app:srcCompat="@drawable/ic_arrow_left_20" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_7"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__7"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_decimal"
                app:layout_constraintEnd_toStartOf="@id/create_payment_fragment_keyboard_8"
                app:layout_constraintStart_toStartOf="parent" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_8"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__8"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_decimal"
                app:layout_constraintEnd_toStartOf="@id/create_payment_fragment_keyboard_9"
                app:layout_constraintStart_toEndOf="@id/create_payment_fragment_keyboard_7" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_9"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__9"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_decimal"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/create_payment_fragment_keyboard_8" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_4"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__4"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_7"
                app:layout_constraintEnd_toStartOf="@id/create_payment_fragment_keyboard_5"
                app:layout_constraintStart_toStartOf="parent" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_5"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__5"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_7"
                app:layout_constraintEnd_toStartOf="@id/create_payment_fragment_keyboard_6"
                app:layout_constraintStart_toEndOf="@id/create_payment_fragment_keyboard_4" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_6"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__6"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_7"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/create_payment_fragment_keyboard_5" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_1"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:layout_marginTop="@dimen/create_payment_key_top_row_margin_top"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__1"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_4"
                app:layout_constraintEnd_toStartOf="@id/create_payment_fragment_keyboard_2"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintVertical_bias="1" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_2"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:layout_marginTop="@dimen/create_payment_key_top_row_margin_top"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__2"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_4"
                app:layout_constraintEnd_toStartOf="@id/create_payment_fragment_keyboard_3"
                app:layout_constraintStart_toEndOf="@id/create_payment_fragment_keyboard_1"
                app:layout_constraintTop_toTopOf="@id/create_payment_fragment_keyboard_1"
                app:layout_constraintVertical_bias="1" />

            <TextView
                android:id="@+id/create_payment_fragment_keyboard_3"
                android:layout_width="@dimen/create_payment_key_size"
                android:layout_height="@dimen/create_payment_key_size"
                android:layout_marginTop="@dimen/create_payment_key_top_row_margin_top"
                android:background="?attr/selectableItemBackground"
                android:gravity="center"
                android:text="@string/CreatePaymentFragment__3"
                android:textColor="@color/signal_text_primary"
                android:textSize="24sp"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_4"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@id/create_payment_fragment_keyboard_2"
                app:layout_constraintTop_toTopOf="@id/create_payment_fragment_keyboard_1"
                app:layout_constraintVertical_bias="1" />

            <include
                android:id="@+id/create_payment_fragment_amount_header"
                layout="@layout/create_payment_fragment_amount"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <org.thoughtcrime.securesms.components.emoji.EmojiTextView
                android:id="@+id/create_payment_fragment_note"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/rounded_rectangle_tertiary"
                android:paddingStart="12dp"
                android:paddingTop="8dp"
                android:paddingEnd="12dp"
                android:paddingBottom="8dp"
                android:visibility="gone"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_1"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/create_payment_fragment_amount_header"
                app:layout_constraintVertical_bias="0.2"
                tools:text="Thanks for dinner!" />

            <com.google.android.material.button.MaterialButton
                android:id="@+id/create_payment_fragment_add_note"
                style="@style/Signal.Widget.Button.Medium.Secondary"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/CreatePaymentFragment__add_note"
                app:layout_constraintBottom_toTopOf="@id/create_payment_fragment_keyboard_1"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@id/create_payment_fragment_amount_header"
                app:layout_constraintVertical_bias="0.2" />

            <androidx.constraintlayout.widget.Barrier
                android:id="@+id/create_payment_fragment_bottom_controls"
                android:layout_width="match_parent"
                android:layout_height="1dp"
                app:barrierDirection="top"
                app:constraint_referenced_ids="create_payment_fragment_request,create_payment_fragment_pay,create_payment_fragment_balance" />

        </androidx.constraintlayout.widget.ConstraintLayout>

    </ScrollView>

</LinearLayout>