Android Tic Tac Toe

ENGINE

package com.example.d851.matrix;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

public class Main extends AppCompatActivity implements View.OnClickListener
{
    Button btTL, btTM, btTR, btML, btMM, btMR, btBL, btBM, btBR, btReset;
    TextView text;
    boolean turn;
    int numOfTurns;
    int[][] board;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btTL = findViewById(R.id.btTL);
        btTM = findViewById(R.id.btTM);
        btTR = findViewById(R.id.btTR);
        btML = findViewById(R.id.btML);
        btMM = findViewById(R.id.btMM);
        btMR = findViewById(R.id.btMR);
        btBL = findViewById(R.id.btBL);
        btBM = findViewById(R.id.btBM);
        btBR = findViewById(R.id.btBR);
        btReset = findViewById(R.id.btReset);
        text = findViewById(R.id.text);
        turn = true;
        numOfTurns = 0;
        board = new int[3][3];
        for (int x = 0; x < 3; x++)
        {
            for (int y = 0; y < 3; y++)
            {
                board[x][y] = 0;
            }
        }

        btTL.setOnClickListener(this);
        btTM.setOnClickListener(this);
        btTR.setOnClickListener(this);
        btML.setOnClickListener(this);
        btMM.setOnClickListener(this);
        btMR.setOnClickListener(this);
        btBL.setOnClickListener(this);
        btBM.setOnClickListener(this);
        btBR.setOnClickListener(this);
        btReset.setOnClickListener(this);
    }

    @Override
    public void onClick(View view)
    {
        if (view == btReset)
        {
            turn = true;
            numOfTurns = 0;
            for (int x = 0; x < 3; x++)
            {
                for (int y = 0; y < 3; y++)
                {
                    board[x][y] = 0;
                }
            }
            btTL.setText("");
            btTM.setText("");
            btTR.setText("");
            btML.setText("");
            btMM.setText("");
            btMR.setText("");
            btBL.setText("");
            btBM.setText("");
            btBR.setText("");
            text.setText("");
        }
        if (!checkWin())
        {
            if (view == btTL && btTL.getText().equals(""))
            {
                btTL.setText(turn ? "X" : "O");
                turn = !turn;
                numOfTurns++;
                board[0][0] = turn ? 1 : -1;
            }
            if (view == btTM && btTM.getText().equals(""))
            {
                btTM.setText(turn ? "X" : "O");
                turn = !turn;
                numOfTurns++;
                board[0][1] = turn ? 1 : -1;
            }
            if (view == btTR && btTR.getText().equals(""))
            {
                btTR.setText(turn ? "X" : "O");
                turn = !turn;
                numOfTurns++;
                board[0][2] = turn ? 1 : -1;
            }
            if (view == btML && btML.getText().equals(""))
            {
                btML.setText(turn ? "X" : "O");
                turn = !turn;
                numOfTurns++;
                board[1][0] = turn ? 1 : -1;
            }
            if (view == btMM && btMM.getText().equals(""))
            {
                btMM.setText(turn ? "X" : "O");
                turn = !turn;
                numOfTurns++;
                board[1][1] = turn ? 1 : -1;
            }
            if (view == btMR && btMR.getText().equals(""))
            {
                btMR.setText(turn ? "X" : "O");
                turn = !turn;
                numOfTurns++;
                board[1][2] = turn ? 1 : -1;
            }
            if (view == btBL && btBL.getText().equals(""))
            {
                btBL.setText(turn ? "X" : "O");
                turn = !turn;
                numOfTurns++;
                board[2][0] = turn ? 1 : -1;
            }
            if (view == btBM && btBM.getText().equals(""))
            {
                btBM.setText(turn ? "X" : "O");
                turn = !turn;
                numOfTurns++;
                board[2][1] = turn ? 1 : -1;
            }
            if (view == btBR && btBR.getText().equals(""))
            {
                btBR.setText(turn ? "X" : "O");
                turn = !turn;
                numOfTurns++;
                board[2][2] = turn ? 1 : -1;
            }

            if (numOfTurns > 4)
            {
                boolean winner = checkWin();
                if (winner)
                    text.setText((!turn) ? "X wins!" : "O wins!");
                else if (numOfTurns == 9)
                {
                    text.setText("It's a tie!");
                }
            }
        }
    }

    public boolean checkWin()
    {
        for (int x = 0; x < 3; x++)
        {
            if (board[x][0] == board[x][1] && board[x][0] == board[x][2] && board[x][0] != 0)
            {
                return true;
            }
        }

        for (int y = 0;y < 3; y++)
        {
            if (board[0][y] == board[1][y] && board[0][y] == board[2][y] && board[0][y] != 0)
            {
                return true;
            }
        }

        if (board[0][0] == board[1][1] && board[0][0] == board[2][2] && board[0][0] != 0)
        {
            return true;
        }

        if (board[0][2] == board[1][1] && board[0][2] == board[2][0] && board[2][0] != 0)
        {
            return true;
        }

        return false;
    }
}

XML

<?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="com.example.d851.matrix.Main">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="40dp"
        android:gravity="center"
        android:textStyle="bold"
        android:text="Tic Tac Toe"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="3"
        android:orientation="horizontal">
        <Button
            android:id="@+id/btTL"
            android:textSize="20dp"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="100dp"/>
        <Button
            android:id="@+id/btTM"
            android:textSize="20dp"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="100dp"/>
        <Button
            android:id="@+id/btTR"
            android:textSize="20dp"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="100dp"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="3"
        android:orientation="horizontal">
        <Button
            android:id="@+id/btML"
            android:textSize="20dp"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="100dp"/>
        <Button
            android:id="@+id/btMM"
            android:textSize="20dp"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="100dp"/>
        <Button
            android:id="@+id/btMR"
            android:textSize="20dp"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="100dp"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="3"
        android:orientation="horizontal">
        <Button
            android:id="@+id/btBL"
            android:textSize="20dp"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="100dp"/>
        <Button
            android:id="@+id/btBM"
            android:textSize="20dp"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="100dp"/>
        <Button
            android:id="@+id/btBR"
            android:textSize="20dp"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="100dp"/>
    </LinearLayout>

    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textSize="35dp"
        android:textStyle="bold" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:orientation="vertical"
        android:layout_weight="1"
        android:gravity="bottom|center">
        <Button
            android:id="@+id/btReset"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Reset"
            android:textStyle="bold"
            android:textSize="20dp"
            android:layout_gravity="center"/>
    </LinearLayout>

</LinearLayout>