gistfile1.txt

   <!-- Keyboard -->
    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/keyboardLayout"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="10dp"
        android:columnCount="3"
        android:rowCount="4"
        >

        <com.google.android.material.button.MaterialButton
            android:id="@+id/button1"
            style="@style/PinButton"
            android:text="1"

            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintEnd_toStartOf="@id/button2"
            app:layout_constraintBottom_toTopOf="@id/button4"
            tools:ignore="HardcodedText" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/button2"
            style="@style/PinButton"
            android:text="2"

            app:layout_constraintStart_toEndOf="@id/button1"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintEnd_toStartOf="@id/button3"
            app:layout_constraintBottom_toTopOf="@id/button5"
            tools:ignore="HardcodedText" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/button3"
            style="@style/PinButton"
            android:text="3"

            app:layout_constraintStart_toEndOf="@id/button2"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toTopOf="@id/button6"
            tools:ignore="HardcodedText" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/button4"
            style="@style/PinButton"
            android:text="4"

            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/button1"
            app:layout_constraintEnd_toStartOf="@id/button5"
            app:layout_constraintBottom_toTopOf="@id/button7"
            tools:ignore="HardcodedText" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/button5"
            style="@style/PinButton"
            android:text="5"

            app:layout_constraintStart_toEndOf="@id/button4"
            app:layout_constraintTop_toBottomOf="@id/button2"
            app:layout_constraintEnd_toStartOf="@id/button6"
            app:layout_constraintBottom_toTopOf="@id/button8"
            tools:ignore="HardcodedText" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/button6"
            style="@style/PinButton"
            android:text="6"

            app:layout_constraintStart_toEndOf="@id/button5"
            app:layout_constraintTop_toBottomOf="@id/button3"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toTopOf="@id/button9"
            tools:ignore="HardcodedText" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/button7"
            style="@style/PinButton"
            android:text="7"

            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/button4"
            app:layout_constraintEnd_toStartOf="@id/button8"
            app:layout_constraintBottom_toTopOf="@id/buttonLeft"
            tools:ignore="HardcodedText" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/button8"
            style="@style/PinButton"
            android:text="8"

            app:layout_constraintStart_toEndOf="@id/button7"
            app:layout_constraintTop_toBottomOf="@id/button5"
            app:layout_constraintEnd_toStartOf="@id/button9"
            app:layout_constraintBottom_toTopOf="@id/button0"
            tools:ignore="HardcodedText" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/button9"
            style="@style/PinButton"
            android:text="9"

            app:layout_constraintStart_toEndOf="@id/button8"
            app:layout_constraintTop_toBottomOf="@id/button6"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toTopOf="@id/buttonRight"
            tools:ignore="HardcodedText" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/buttonLeft"
            style="@style/PinButton"
            app:icon="@drawable/ic_fingerprint"
            app:iconTint="@color/pin_button_color_states_inverse"
            app:iconGravity="textStart"
            app:iconPadding="0dp"
            app:strokeWidth="0dp"

            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/button7"
            app:layout_constraintEnd_toStartOf="@id/button0"
            app:layout_constraintBottom_toBottomOf="parent"
            tools:ignore="ContentDescription" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/button0"
            style="@style/PinButton"
            android:text="0"

            app:layout_constraintStart_toEndOf="@id/buttonLeft"
            app:layout_constraintTop_toBottomOf="@id/button8"
            app:layout_constraintEnd_toStartOf="@id/buttonRight"
            app:layout_constraintBottom_toBottomOf="parent"
            tools:ignore="HardcodedText" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/buttonRight"
            style="@style/PinButton"
            app:icon="@drawable/ic_backspace"
            app:iconTint="@color/pin_button_color_states_inverse"
            app:iconGravity="textStart"
            app:iconPadding="5dp"
            app:strokeWidth="0dp"

            app:layout_constraintStart_toEndOf="@id/button0"  
            app:layout_constraintTop_toBottomOf="@id/button9"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            tools:ignore="ContentDescription" />

    </androidx.constraintlayout.widget.ConstraintLayout>