kalkulator XML

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:background="@color/blue"
    tools:context=".MainActivity">


    <TableLayout
        android:id="@+id/tableLayout"
        android:layout_width="0dp"
        android:layout_height="420dp"
        android:stretchColumns="*"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0">

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <Button
                android:id="@+id/clear"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="AC"
                android:onClick="allClear"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/minusButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="+/-"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/percentButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="%"
                android:onClick="countPerc"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/divButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="/"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />
        </TableRow>

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <Button
                android:id="@+id/sevenButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="7"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/eightButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="8"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/nineButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="9"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/mulButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="x"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />
        </TableRow>

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <Button
                android:id="@+id/fourButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="4"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/fiveButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="5"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/sixButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="6"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/subButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="-"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

        </TableRow>

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <Button
                android:id="@+id/oneButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="1"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/twoButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="2"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/threeButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="3"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/sumButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="+"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />
        </TableRow>

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            tools:layout_editor_absoluteX="-207dp"
            tools:layout_editor_absoluteY="639dp">

            <Button
                android:id="@+id/zeroButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="0"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/nothing"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                app:backgroundTint="@color/light_gray"
                tools:ignore="SpeakableTextPresentCheck" />

            <Button
                android:id="@+id/commaButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text=","
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/equalsButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="="
                android:onClick="showResult"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />
        </TableRow>
    </TableLayout>

    <TextView
        android:id="@+id/result"
        android:layout_width="0dp"
        android:layout_height="170dp"
        android:background="@color/blue"
        android:text="0"
        android:textStyle="bold"
        android:textAlignment="viewEnd"
        android:textColor="@color/white"
        android:textSize="75sp"
        app:layout_constraintBottom_toTopOf="@+id/tableLayout"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0"
        tools:ignore="TextContrastCheck" />

    <TextView
        android:id="@+id/workings"
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:text=""
        android:textAlignment="viewEnd"
        android:textColor="@color/white"
        android:textSize="40sp"
        app:layout_constraintBottom_toTopOf="@+id/result"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0" />
</androidx.constraintlayout.widget.ConstraintLayout>







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LANDSCAPE
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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:background="@color/blue"
    tools:context=".MainActivity">


    <TableLayout
        android:id="@+id/tableLayout"
        android:layout_width="0dp"
        android:layout_height="255dp"
        android:stretchColumns="*"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0">

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <Button
                android:id="@+id/clear"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="AC"
                android:onClick="allClear"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/minusButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="+/-"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/percentButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="%"
                android:onClick="countPerc"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/divButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="/"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/logButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="log10"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/green" />
        </TableRow>

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <Button
                android:id="@+id/sevenButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="7"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/eightButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="8"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/nineButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="9"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/mulButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="x"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/factorialButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="x!"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/green" />
        </TableRow>

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <Button
                android:id="@+id/fourButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="4"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/fiveButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="5"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/sixButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="6"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/subButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="-"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/sqrtButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="sqrt(x)"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/green" />

        </TableRow>

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <Button
                android:id="@+id/oneButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="1"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/twoButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="2"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/threeButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="3"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/sumButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="+"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/cuberootButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="x^3"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/green" />
        </TableRow>

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            tools:layout_editor_absoluteX="-207dp"
            tools:layout_editor_absoluteY="639dp">

            <Button
                android:id="@+id/zeroButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="0"
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/nothing"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/commaButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text=","
                android:onClick="clickNumber"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/equalsButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="="
                android:onClick="showResult"
                android:textSize="20sp"
                app:backgroundTint="@color/light_gray" />

            <Button
                android:id="@+id/squarerootButton"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/background_buttons"
                android:text="x^2"
                android:onClick="clickOperator"
                android:textSize="20sp"
                app:backgroundTint="@color/green" />
        </TableRow>
    </TableLayout>

    <TextView
        android:id="@+id/result"
        android:layout_width="0dp"
        android:layout_height="70dp"
        android:background="@color/blue"
        android:text="0"
        android:textStyle="bold"
        android:textAlignment="viewEnd"
        android:textColor="@color/white"
        android:textSize="45sp"
        app:layout_constraintBottom_toTopOf="@+id/tableLayout"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0"
        tools:ignore="TextContrastCheck" />

    <TextView
        android:id="@+id/workings"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:text=""
        android:textAlignment="viewEnd"
        android:textColor="@color/white"
        android:textSize="30sp"
        app:layout_constraintBottom_toTopOf="@+id/result"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.444" />
</androidx.constraintlayout.widget.ConstraintLayout>