MainActivity code

MainActivity.java

package com.techienaman.tictactoe;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    boolean gameActive = true;
    // Player Representation:
    // 0 - X
    // 1 - O
    int activePlayer = 0;

    // State meaning:
    // 0 - X
    // 1 - O
    // 2 - Null
    int gameState[] = {2, 2, 2, 2, 2, 2, 2, 2, 2};

    // Game winning positions
    int winPositions[][] = {
            {0, 1, 2}, {3, 4, 5}, {6, 7, 8},
            {0, 3, 6}, {1, 4, 7}, {2, 5, 8},
            {0, 4, 8}, {2, 4, 6}
    };

    public void playerTap(View view) {
        ImageView img = (ImageView) view;
        int tappedImage = Integer.parseInt(img.getTag().toString());

        if (!gameActive) {
            gameReset(view);
        }

        if (gameState[tappedImage] == 2) {
            gameState[tappedImage] = activePlayer;
            img.setTranslationY(-1000f);

            if (activePlayer == 0) {
                img.setImageResource(R.drawable.x);
                activePlayer = 1;
                TextView status = findViewById(R.id.status);
                status.setText("O's Turn - Tap To Play");
            } else {
                img.setImageResource(R.drawable.zero);
                activePlayer = 0;
                TextView status = findViewById(R.id.status);
                status.setText("X's Turn - Tap To Play");
            }
            img.animate().translationYBy(1000f).setDuration(300);
        }

        // check if any player won
        for (int[] winPosition : winPositions) {
            if (gameState[winPosition[0]] == gameState[winPosition[1]] &&
                    gameState[winPosition[1]] == gameState[winPosition[2]] &&
                    gameState[winPosition[0]] != 2) {

                String winnerStr;
                gameActive = false;
                if (gameState[winPosition[0]] == 0) {
                    winnerStr = "X has won";
                } else {
                    winnerStr = "O has won";
                }
                // Update the status bar for the winner
                TextView status = findViewById(R.id.status);
                status.setText(winnerStr);

            }
        }
    }

    public void gameReset(View view) {
        gameActive = true;
        activePlayer = 0;
        for (int i = 0; i < gameState.length; i++) {
            gameState[i] = 2;
        }

        // Hiding and show Image after button click
        ((ImageView) findViewById(R.id.imageView0)).setImageResource(0);
        ((ImageView) findViewById(R.id.imageView1)).setImageResource(0);
        ((ImageView) findViewById(R.id.imageView2)).setImageResource(0);
        ((ImageView) findViewById(R.id.imageView3)).setImageResource(0);
        ((ImageView) findViewById(R.id.imageView4)).setImageResource(0);
        ((ImageView) findViewById(R.id.imageView5)).setImageResource(0);
        ((ImageView) findViewById(R.id.imageView6)).setImageResource(0);
        ((ImageView) findViewById(R.id.imageView7)).setImageResource(0);
        ((ImageView) findViewById(R.id.imageView8)).setImageResource(0);
    }

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