PPB android studio

 

<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".home"
    android:orientation="vertical"
    android:layout_gravity="center"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="350dp"
        android:orientation="horizontal"
        android:layout_margin="10dp"
        android:layout_gravity="center"
        >
        <Button
            android:layout_width="100dp"
            android:layout_height="300dp"
            android:background="@color/purple_200"
            android:layout_margin="5dp"
            />
        <Button
            android:layout_width="150dp"
            android:layout_height="300dp"
            android:background="@color/purple_200"
            android:layout_margin="5dp"
            />
        <Button
            android:layout_width="100dp"
            android:layout_height="300dp"
            android:background="@color/purple_200"
            android:layout_margin="5dp"
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_margin="10dp"
        android:layout_gravity="center"
        >
        <Button
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:background="@color/purple_500"
            android:layout_margin="5dp"
            />
        <Button
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:background="@color/purple_500"
            android:layout_margin="5dp"
            />
        <Button
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:background="@color/purple_500"
            android:layout_margin="5dp"
            />

    </LinearLayout>