layout of a basic calculator

activity_main.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"
    tools:context=".MainActivity">

    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="96dp"
        android:layout_height="296dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.984"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.997">


        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <Button
                android:id="@+id/button13"
                android:layout_width="74dp"
                android:layout_height="38dp"
                android:layout_alignParentRight="true"
                android:text="C"
                android:onClick="cleartext"/>
        </RelativeLayout>


        <Button
            android:id="@+id/buttonAdd"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="suma"
            android:text="@string/suma" />

        <Button
            android:id="@+id/buttonSub"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="resta"
            android:text="@string/resta" />

        <Button
            android:id="@+id/buttonMul"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="multiplicacion"
            android:text="@string/multiplicacion" />

        <Button
            android:id="@+id/buttonDiv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="division"
            android:text="@string/division" />

        <Button
            android:id="@+id/buttonEnter"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="enter"
            android:text="@string/enter" />
    </LinearLayout>

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/campo"
        android:textSize="32sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.293" />

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="82dp"
        android:layout_height="190dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/linearLayout3"
        app:layout_constraintHorizontal_bias="0.551"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.961">

        <Button
            android:id="@+id/button1"
            android:layout_width="match_parent"
            android:layout_height="42dp"
            android:onClick="button1"
            android:text="@string/_1" />

        <Button
            android:id="@+id/button4"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="button4"
            android:text="@string/_4" />

        <Button
            android:id="@+id/button7"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="button7"
            android:text="@string/_7" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/linearLayout3"
        android:layout_width="82dp"
        android:layout_height="210dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.337"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.997">

        <Button
            android:id="@+id/button2"
            android:layout_width="match_parent"
            android:layout_height="42dp"
            android:onClick="button2"
            android:text="@string/_2" />

        <Button
            android:id="@+id/button5"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="button5"
            android:text="@string/_5" />

        <Button
            android:id="@+id/button8"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="button8"
            android:text="@string/_8" />

        <Button
            android:id="@+id/button0"
            android:layout_width="match_parent"
            android:layout_height="63dp"
            android:onClick="button0"
            android:text="@string/_0" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/linearLayout5"
        android:layout_width="82dp"
        android:layout_height="190dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/linearLayout2"
        app:layout_constraintHorizontal_bias="0.326"
        app:layout_constraintStart_toEndOf="@+id/linearLayout3"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.961">

        <Button
            android:id="@+id/button3"
            android:layout_width="match_parent"
            android:layout_height="42dp"
            android:onClick="button3"
            android:text="@string/_3" />

        <Button
            android:id="@+id/button6"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="button6"
            android:text="@string/_6" />

        <Button
            android:id="@+id/button9"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="button9"
            android:text="@string/_9" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/linearLayout4"
        android:layout_width="281dp"
        android:layout_height="79dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@+id/linearLayout3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.058"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.919">

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="ySQRTx"
            android:text="y √ x" />

        <Button
            android:id="@+id/button10"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="potenciaE"
            android:text="POT e" />

        <Button
            android:id="@+id/button11"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="reciproca"
            android:text="reciproca" />

        <Button
            android:id="@+id/button12"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="raizCuadrada"
            android:text="raiz 2" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="285dp"
        android:layout_height="52dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@+id/linearLayout4"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.049"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0">
        <!--This button is a number of the times of a root n-->
        <Button
            android:id="@+id/button14"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="yPOTx"
            android:onClick="yPotenciax"/>

        <Button
            android:id="@+id/button15"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="LOG 10"
            android:onClick="logaritmo10"/>
        <!--Valor de 10 elevado a un numero ingresado-->
        <Button
            android:id="@+id/button16"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="10 pot x"
            android:onClick="Pot10"/>

        <Button
            android:id="@+id/button17"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/eX"
            android:onClick="logaritmoNatural"/>
    </LinearLayout>


</androidx.constraintlayout.widget.ConstraintLayout>