TicTacToe.java

package com.example.lab1.tictactoe;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class TicTacToe extends AppCompatActivity {

    private static final int BOARD_SIZE = 3;
    private static final String DEFAULT_TEXT = "?";

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

        generateLayout((ViewGroup) findViewById(R.id.ticTacToeLayout));
    }

    private void log(String s) {
        Log.i("BOI", s);
    }

    private void generateLayout(ViewGroup parent) {
        TableLayout tl = (TableLayout) new TableLayout(this);
        tl.setLayoutParams(new TableLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));

        parent.addView(tl);

        Counter[] xRow = new Counter[BOARD_SIZE];
        Counter[] oRow = new Counter[BOARD_SIZE];
        Counter[] xCol = new Counter[BOARD_SIZE];
        Counter[] oCol = new Counter[BOARD_SIZE];
        Counter[] xDiag = new Counter[2];
        Counter[] oDiag = new Counter[2];

        Toggle turnToggle = new Toggle();
        turnToggle.toggle();

        for (int i = 0; i < BOARD_SIZE; i++) {
            xRow[i] = new Counter();
            oRow[i] = new Counter();
            xCol[i] = new Counter();
            oCol[i] = new Counter();
        }

        for (int i = 0; i < 2; i++) {
            xDiag[i] = new Counter();
            oDiag[i] = new Counter();
        }

        for (int i = 0; i < BOARD_SIZE; i++) {
            TableRow tr = new TableRow(this);
            tr.setLayoutParams(new TableLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));

            tl.addView(tr);

            for (int j = 0; j < BOARD_SIZE; j++) {
                Button tv = new Button(this);
                tr.addView(tv);
                tv.setTextAppearance(R.style.TextAppearance_AppCompat_Title);
                tv.setText(DEFAULT_TEXT);

                List<Counter> xs = new ArrayList<>(Arrays.asList(xRow[i], xCol[j]));
                List<Counter> os = new ArrayList<>(Arrays.asList(oRow[i], oCol[j]));

                if (i == j) {
                    xs.add(xDiag[0]);
                    os.add(oDiag[0]);
                } else if (i + j == BOARD_SIZE - 1) {
                    log(String.format("(%s, %s)", i, j));
                    xs.add(xDiag[1]);
                    os.add(oDiag[1]);
                }

                tv.setOnClickListener(new CellListener(xs, os, turnToggle));
            }
        }
    }


    private class Counter {

        private int val = 0;

        public int value() { return val; }

        public void increase() { val++; }
    }

    private class Toggle {

        private boolean val = false;

        public boolean state() {
            return val;
        }

        public void toggle() {
            val = !val;
        }
    }

    private class CellListener implements View.OnClickListener {

        private List<Counter> xs, os;
        private Toggle toggle;

        public CellListener(List<Counter> xs, List<Counter> os, Toggle toggle) {
            this.xs = xs;
            this.os = os;
            this.toggle = toggle;
        }


        @Override
        public void onClick(View v) {
            List<Counter> counterList = toggle.state() ? xs : os;
            String name = toggle.state() ? "X" : "O";

            Button tv = (Button) v;

            if (tv.getText() != DEFAULT_TEXT) return;
            else tv.setText(name);


            for (Counter c : counterList) {
                c.increase();

                if (c.value() == BOARD_SIZE) {
                    log(name + " wins!");
                    break;
                }
            }

            toggle.toggle();
        }
    }
}