Simple Maru-Batsu Game (noughts-and-crosses) Code for an Android app

MaruBatsu MainActivity.java

package com.dev_training.android.maru_batsu;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

  
	private static final int STATE_BATSU = 1;
	private static final int STATE_MARU = 2;
	ImageButton imageButton[][] = new ImageButton[3][];
	int cellState[][] = new int[3][];
	
	
	boolean mode = false; // false = maru, true = batsu
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		for (int i=0; i<3; i++){
			imageButton[i] = new ImageButton[3];
			cellState[i] = new int[3];
		}
		
		imageButton[0][0] = (ImageButton) findViewById(R.id.ib00);
		imageButton[0][1] = (ImageButton) findViewById(R.id.ib01);
		imageButton[0][2] = (ImageButton) findViewById(R.id.ib02);	
		imageButton[1][0] = (ImageButton) findViewById(R.id.ib10);	
		imageButton[1][1] = (ImageButton) findViewById(R.id.ib11);	
		imageButton[1][2] = (ImageButton) findViewById(R.id.ib12);	
		imageButton[2][0] = (ImageButton) findViewById(R.id.ib20);	
		imageButton[2][1] = (ImageButton) findViewById(R.id.ib21);	
		imageButton[2][2] = (ImageButton) findViewById(R.id.ib22);	
		
		
		
		findViewById(R.id.resetButton).setOnClickListener(this);
		
	}

	void reset(){
		for (int y = 0; y < 3; y++){
			for (int x = 0; x < 3; x++){
				imageButton[y][x].setImageResource(R.drawable.cell_back);		
				imageButton[y][x].setOnClickListener(this);	
				cellState[y][x] = 0;
			}
		}
	}
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

	@Override
	public void onClick(View v) {
		// クリックしたときの処理
		for (int y = 0; y < 3; y++){
			for (int x = 0; x < 3; x++){
				if (imageButton[y][x].getId() == v.getId()){
					// 設置されていない場合
					if (cellState[y][x] == 0) {
						// ヒットしたら、○もしくは×を描画
						imageButton[y][x].setImageResource(
								(mode)? R.drawable.batsu: R.drawable.maru);
						cellState[y][x] = (mode)? STATE_BATSU : STATE_MARU;
						
						// 判定
						if(judge()) {
							// 結果表示
							Toast.makeText(this, "勝負あり！", Toast.LENGTH_LONG).show();
							return;
						}
						
						mode = !mode;
						break;
					}
					
				}
			}
		}
		
		if (v.getId() == R.id.resetButton){
			reset();
		}

	}
	
	// 判定
	boolean judge(){
		// 横、斜め、縦方向に３連続のコマがないか探索
		int state = (mode)? STATE_BATSU: STATE_MARU;
		
		for (int row=0; row<3; row++) {
			if (judgeRow(row)) return true;
		}
		for (int column=0; column<3; column++) {
			if (judgeColumn(column)) return true;
		}
		
		// 左上から右下の判定
		if (cellState[0][0] == state
				&& cellState[1][1] == state 
				&& cellState[2][2] == state ) return true;
		// 右上から左下の判定
		if (cellState[0][2] == state
				&& cellState[1][1] == state 
				&& cellState[2][0] == state ) return true;
		
		return false;
	}
	
	boolean judgeRow(int row){
		int state = (mode)? STATE_BATSU: STATE_MARU;
		
		for (int i=0; i<3; i++){
			if (cellState[row][i] != state) return false;
		}		
		return true;
	}
	
	boolean judgeColumn(int column){
		int state = (mode)? STATE_BATSU: STATE_MARU;
		
		for (int i=0; i<3; i++){
			if (cellState[i][column] != state) return false;
		}		
		return true;
	}

}