HW2

<?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="horizontal"
    android:weightSum="4"
    tools:context=".MainActivity">


    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical"
        android:weightSum="4">
            <Button
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="3"
                />
    </LinearLayout>


    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="3"
        android:orientation="vertical"
        android:weightSum="4">

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

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:orientation="horizontal"
            android:weightSum="3">

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

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

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

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:orientation="horizontal"
            android:weightSum="3">

            <Button
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="2" />

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


        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:orientation="horizontal"
            android:weightSum="3">

            <Button
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="3" />


        </LinearLayout>


    </LinearLayout>

</LinearLayout>