GridLayout

<?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"
    tools:context="com.example.i310_54.myapplication08.MainActivity"
    >

    <GridLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
 
 

        android:columnCount="3"
        android:rowCount="2"
        >
    
        <Button android:text="1" />
        <Button android:text="1" />
        <Button android:text="1" />
        <Button android:text="1" />
        <Button android:text="1" />
        <Button android:text="1" />

    </GridLayout>


</LinearLayout>

<?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"
    tools:context="com.example.i310_54.myapplication08.MainActivity"

    >

    <GridLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:columnCount="3"
        android:rowCount="2"
        >

        <Button android:text="1" android:layout_row="0" android:layout_column="0"/>
        <Button android:text="1" android:layout_row="0" android:layout_column="1"/>
        <Button android:text="1" android:layout_row="0" android:layout_column="2"/>
        <Button android:text="1" android:layout_row="1" android:layout_column="0"/>
        <Button android:text="1" android:layout_row="1" android:layout_column="1"/>
        <Button android:text="1" android:layout_row="1" android:layout_column="2"/>

    </GridLayout>


</LinearLayout>

 * android:layout_row 와 column은 필수 속성은 아니지만 그 부분(ex.0,1)만 지우고 싶을때 주석 잡고 쓰임