在慕课网上学习了五子棋的课程，感觉挺不错。然后自己写了个关于五子棋的android程序，从中还是能够学习到很多东西的。现在我们开始今天五子棋程序的编写历程。程序的源码请参见友情链接：
目录导航
好了，我们现在开始一步步的构建出项目来，首先是如下的项目结构图：
运行的效果图：
一、 主活动类MainActivity，在菜单中加入了再来一局的功能：
public class MainActivity extends AppCompatActivity { private ChessBoardView chessBoardView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); chessBoardView = (ChessBoardView) findViewById(R.id.boardView); } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); // 再来一局 if (id == R.id.action_setting) { chessBoardView.start(); return true; } return super.onOptionsItemSelected(item); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_main, menu); return true; } }
二、 常量类便于维护管理：Constants
public class Constants { // 五子连珠 public final static int MAX_COUNT_IN_LINE = 5; // 棋盘的行数 final static int MAX_LINE = 15; // 检查的方向 final static int HORIZONTAL = 0; final static int VERTICAL = 1; final static int LEFT_DIAGONAL = 2; final static int RIGHT_DIAGONAL = 4; }
三、 activity_main.xml中增加了自定义棋盘的View：
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@mipmap/bg" tools:context="com.example.linux.mygobang.MainActivity"> <com.example.linux.mygobang.ChessBoardView android:id="@+id/boardView" android:layout_centerInParent="true" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout>
四、 menu_main.xml中定义再来一局的菜单：
<?xml version="1.0" encoding="utf-8"?> <menu xmlns:tools="http://schemas.android.com/tools" xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/action_setting" android:title="再来一局" android:orderInCategory="100" android:showAsAction="never" tools:ignore="AppCompatResource" /> </menu>
ChessBoardView类，是整个程序比较核心的部分。
一、 初始化工作，程序中用到的变量也放在下面的代码中：
// 棋盘的宽度，也是长度 private int mViewWidth; // 棋盘每格的长度 private float maxLineHeight; private Paint paint = new Paint(); // 定义黑白棋子的Bitmap private Bitmap mwhitePiece, mblackPiece; private float ratioPieceOfLineHeight = 3 * 1.0f / 4; // 判断当前落下的棋子是否是白色的 private boolean mIsWhite = true; // 记录黑白棋子位置的列表 private ArrayList<Point> mwhiteArray = new ArrayList<>(); private ArrayList<Point> mblackArray = new ArrayList<>(); // 游戏是否结束 private boolean mIsGameOver; // 游戏结束，是否是白色方胜利 private boolean mIsWhiteWinner; public ChessBoardView(Context context, AttributeSet attrs) { super(context, attrs); init(); } private void init() { paint.setColor(0x88000000); paint.setAntiAlias(true); paint.setDither(true); paint.setStyle(Paint.Style.STROKE); mwhitePiece = BitmapFactory.decodeResource(getResources(), R.mipmap.stone_w2); mblackPiece = BitmapFactory.decodeResource(getResources(), R.mipmap.stone_b1); }
二、 onMeasure方法，测量View的大小，使View的长宽一致。
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthSize = MeasureSpec.getSize(widthMeasureSpec); int widthModel = MeasureSpec.getMode(widthMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); int heightModel = MeasureSpec.getMode(heightMeasureSpec); int width = Math.min(widthSize, heightSize); if (widthModel == MeasureSpec.UNSPECIFIED) { width = heightSize; } else if (heightModel == MeasureSpec.UNSPECIFIED) { width = widthSize; } setMeasuredDimension(width, width); }
三、 onSizeChanged方法在布局的阶段，如果View的大小发生改变，此方法得到调用。
@Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mViewWidth = w; maxLineHeight = mViewWidth * 1.0f / Constants.MAX_LINE; int pieceWidth = (int) (maxLineHeight * ratioPieceOfLineHeight); mwhitePiece = Bitmap.createScaledBitmap(mwhitePiece, pieceWidth, pieceWidth, false); mblackPiece = Bitmap.createScaledBitmap(mblackPiece, pieceWidth, pieceWidth, false); }
四、 onTouchEvent方法中处理我们下棋子的位置：
@Override public boolean onTouchEvent(MotionEvent event) { if (mIsGameOver) { return false; } int action = event.getAction(); if (action == MotionEvent.ACTION_UP) { int x = (int) event.getX(); int y = (int) event.getY(); Point point = getValidPoint(x, y); if (mwhiteArray.contains(point) || mblackArray.contains(point)) { return false; } if (mIsWhite) { mwhiteArray.add(point); } else { mblackArray.add(point); } invalidate(); mIsWhite = !mIsWhite; } return true; }
五、 在onDraw方法做棋盘的绘制工作：
@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); // 绘制棋盘的网格 drawBoard(canvas); // 绘制棋盘的黑白棋子 drawPieces(canvas); // 检查游戏是否结束 checkGameOver(); }
六、 接下来，我们按上面的流程，一个个的做详细的解释：
绘制棋盘的网格：
// 绘制棋盘的网线 private void drawBoard(Canvas canvas) { int w = mViewWidth; float lineHeight = maxLineHeight; for (int i = 0; i < Constants.MAX_LINE; i++) { int startX = (int) (lineHeight / 2); int endX = (int) (w - lineHeight / 2); int y = (int) ((0.5 + i) * lineHeight); canvas.drawLine(startX, y, endX, y, paint); canvas.drawLine(y, startX, y, endX, paint); } }
绘制棋盘的黑白棋子：
// 根据黑白棋子的数组绘制棋子 private void drawPieces(Canvas canvas) { for (int i = 0, n = mwhiteArray.size(); i < n; i++) { Point whitePoint = mwhiteArray.get(i); float left = (whitePoint.x + (1 - ratioPieceOfLineHeight) / 2) * maxLineHeight; float top = (whitePoint.y + (1 - ratioPieceOfLineHeight) / 2) * maxLineHeight; canvas.drawBitmap(mwhitePiece, left, top, null); } for (int i = 0, n = mblackArray.size(); i < n; i++) { Point blackPoint = mblackArray.get(i); float left = (blackPoint.x + (1 - ratioPieceOfLineHeight) / 2) * maxLineHeight; float top = (blackPoint.y + (1 - ratioPieceOfLineHeight) / 2) * maxLineHeight; canvas.drawBitmap(mblackPiece, left, top, null); } }
检查游戏是否已经结束：
// 检查游戏是否结束 private void checkGameOver() { CheckWinner checkWinner = new CheckWinner(); boolean whiteWin = checkWinner.checkFiveInLineWinner(mwhiteArray); boolean blackWin = checkWinner.checkFiveInLineWinner(mblackArray); if (whiteWin || blackWin) { mIsGameOver = true; mIsWhiteWinner = whiteWin; String text = mIsWhiteWinner ? "白棋胜利" : "黑棋胜利"; Toast.makeText(getContext(), text, Toast.LENGTH_SHORT).show(); } }
一、 保存残局，例如切换横坚屏时：
private static final String INSTANCE = "instance"; private static final String INSTANCE_GAME_OVER = "instance_game_over"; private static final String INSTANCE_WHITE_ARRAY = "instance_white_array"; private static final String INSTANCE_BLACK_ARRAY = "instance_black_array"; @Override protected Parcelable onSaveInstanceState() { Bundle bundle = new Bundle(); bundle.putParcelable(INSTANCE, super.onSaveInstanceState()); bundle.putBoolean(INSTANCE_GAME_OVER, mIsGameOver); bundle.putParcelableArrayList(INSTANCE_BLACK_ARRAY, mblackArray); bundle.putParcelableArrayList(INSTANCE_WHITE_ARRAY, mwhiteArray); return bundle; }
二、 从bundle中恢复棋局：
@Override protected void onRestoreInstanceState(Parcelable state) { if (state instanceof Bundle) { Bundle bundle = (Bundle) state; mIsGameOver = bundle.getBoolean(INSTANCE_GAME_OVER); mwhiteArray = bundle.getParcelableArrayList(INSTANCE_WHITE_ARRAY); mblackArray = bundle.getParcelableArrayList(INSTANCE_BLACK_ARRAY); super.onRestoreInstanceState(bundle.getParcelable(INSTANCE)); return; } super.onRestoreInstanceState(state); }
三、 增加再来一局游戏的逻辑：
// 再来一局 public void start() { mwhiteArray.clear(); mblackArray.clear(); mIsGameOver = false; mIsWhiteWinner = false; invalidate(); }
在CheckWinner中，对棋盘中的棋子做”米“字型的检查是否五子连珠：
一、 check方法中，针对不同的方向，做判断：
private boolean check(int x, int y, List<Point> points, int checkOri) { int count = 1; for (int i = 1; i < Constants.MAX_COUNT_IN_LINE; i++) { switch (checkOri) { case Constants.HORIZONTAL: point1 = new Point(x - i, y); point2 = new Point(x + i, y); break; case Constants.VERTICAL: point1 = new Point(x, y - i); point2 = new Point(x, y + i); break; case Constants.LEFT_DIAGONAL: point1 = new Point(x - i, y + i); point2 = new Point(x + i, y - i); break; case Constants.RIGHT_DIAGONAL: point1 = new Point(x + i, y + i); point2 = new Point(x - i, y - i); break; } if (points.contains(point1) || points.contains(point2)) { count++; } else { break; } } if (count == Constants.MAX_COUNT_IN_LINE) { return true; } return false; }
二、 做四个方向检查：
// 横向判断 private boolean checkHorizontal(int x, int y, List<Point> points) { checkModel = Constants.HORIZONTAL; return check(x, y, points, checkModel); } // 竖向判断 private boolean checkVertical(int x, int y, List<Point> points) { checkModel = Constants.VERTICAL; return check(x, y, points, checkModel); } // 左斜判断 private boolean checkLeftDiagonal(int x, int y, List<Point> points) { checkModel = Constants.LEFT_DIAGONAL; return check(x, y, points, checkModel); } // 右斜判断 private boolean checkRighttDiagonal(int x, int y, List<Point> points) { checkModel = Constants.RIGHT_DIAGONAL; return check(x, y, points, checkModel); }
三、 做具体的判断，是否游戏结束：
private Point point1, point2; private int checkModel = -1; public boolean checkFiveInLineWinner(List<Point> points) { for (Point point : points) { int x = point.x; int y = point.y; if (checkHorizontal(x, y, points)) { return true; } else if (checkVertical(x, y, points)) { return true; } else if (checkLeftDiagonal(x, y, points)) { return true; } else if (checkRighttDiagonal(x, y, points)) { return true; } } return false; }
原文：http://www.cnblogs.com/huhx/p/MyAndroidgobang.html