Making 3 by 3 buttons in Android Studio

I am new to learning how to use Android Studio. I was trying to follow a Youtube Video on how to create a game of TicTacToe and some part of the instruction was unclear.

At the moment, I have this:

But I want to be like this:

My activity_main.xml file code:

<?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="vertical"
    tools:context=".MainActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/text_view_p1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Player 1 : 0"
            android:textSize="30sp" />
        <TextView
            android:id="@+id/text_view_p2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/text_view_p1"
            android:text="Player 2 : 0"
            android:textSize="30sp" />

        <Button
            android:id="@+id/button_reset"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:layout_centerVertical="true"
            android:layout_marginEnd="41dp"
            android:text="reset" />

    </RelativeLayout>

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

        <Button
            android:id="@+id/button_00"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:textSize="60sp" />

        <Button
            android:id="@+id/button_01"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:textSize="60sp" />

        <Button
            android:id="@+id/button_02"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:textSize="60sp" />

        <Button
            android:id="@+id/button_10"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:textSize="60sp" />

        <Button
            android:id="@+id/button_11"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:textSize="60sp" />

        <Button
            android:id="@+id/button_12"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:textSize="60sp" />

    </LinearLayout>

</LinearLayout>

My MainActivity.java file code:

package com.example.tictactoe;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private Button[][] buttons = new Button[3][3];

    private boolean player1Turn = true;

    private int rountCount;

    private int player1Points;
    private int player2Points;

    private TextView textViewplayer1;
    private TextView textViewplayer2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

I feel that mostly something is not correct with the button section of the script of the activity_main.xml file.

Which part of my code am I not doing correctly?

You are doing it wrong first don't make height of your parent layout to match parent and secondly you have to user nested linear layouts to achieve your goal I would suggest you to use constraint layout instead.

I have left the last row for you to complete, and I have sorted your code out so I am sure you won't find any issue doing that

    <?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="wrap_content"
android:orientation="vertical"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/text_view_p1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Player 1 : 0"
android:textSize="30sp" />
<TextView
android:id="@+id/text_view_p2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text_view_p1"
android:text="Player 2 : 0"
android:textSize="30sp" />
<Button
android:id="@+id/button_reset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_marginEnd="41dp"
android:text="reset" />
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/button_00"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_01"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_02"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/button_10"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_11"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_12"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
</LinearLayout>
</LinearLayout>
</LinearLayout>

Set heights of buttons to wrap_content instead of match_parent:

<?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="vertical"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/text_view_p1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Player 1 : 0"
android:textSize="30sp" />
<TextView
android:id="@+id/text_view_p2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text_view_p1"
android:text="Player 2 : 0"
android:textSize="30sp" />
<Button
android:id="@+id/button_reset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_marginEnd="41dp"
android:text="reset" />
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="@+id/button_00"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_01"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_02"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_10"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_11"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_12"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textSize="60sp" />
</LinearLayout>
</LinearLayout>

Try this. But not tested.

<?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="vertical"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/text_view_p1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Player 1 : 0"
android:textSize="30sp" />
<TextView
android:id="@+id/text_view_p2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text_view_p1"
android:text="Player 2 : 0"
android:textSize="30sp" />
<Button
android:id="@+id/button_reset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_marginEnd="41dp"
android:text="reset" />
</RelativeLayout>
<LinearLayout 
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="3" >
<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="fill_parent"
android:layout_weight="1"
/>
<Button
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
/>
<Button
android:layout_width="0dp"
android:layout_height="fill_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="fill_parent"
android:layout_weight="1"
/>
<Button
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
/>
<Button
android:layout_width="0dp"
android:layout_height="fill_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="fill_parent"
android:layout_weight="1"
/>
<Button
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
/>
<Button
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
/>
</LinearLayout>
</LinearLayout>
</LinearLayout>

You should use TableLayout as following

<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="vertical"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/text_view_p1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Player 1 : 0"
android:textSize="30sp" />
<TextView
android:id="@+id/text_view_p2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text_view_p1"
android:text="Player 2 : 0"
android:textSize="30sp" />
<Button
android:id="@+id/button_reset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_marginEnd="41dp"
android:text="reset" />
</RelativeLayout>
<TableLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:stretchColumns="*"
android:layout_weight="1">
<TableRow>
<Button
android:textSize="60sp" />
<Button
android:textSize="60sp" />
<Button
android:textSize="60sp" />
</TableRow>
<TableRow>
<Button
android:textSize="60sp" />
<Button
android:textSize="60sp" />
<Button
android:textSize="60sp" />
</TableRow>
<TableRow>
<Button
android:textSize="60sp" />
<Button
android:textSize="60sp" />
<Button
android:textSize="60sp" />
</TableRow>
</TableLayout>
</LinearLayout>

Depend your button id. I think it is :

<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="vertical"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/text_view_p1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Player 1 : 0"
android:textSize="30sp" />
<TextView
android:id="@+id/text_view_p2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text_view_p1"
android:text="Player 2 : 0"
android:textSize="30sp" />
<Button
android:id="@+id/button_reset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_marginEnd="41dp"
android:text="reset" />
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="@+id/button_00"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_01"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_02"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="@+id/button_10"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_11"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_12"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<Button
android:id="@+id/button_20"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_21"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
<Button
android:id="@+id/button_22"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:textSize="60sp" />
</LinearLayout>

</LinearLayout>