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Class MyMIDlet extends MIDlet { private FirstScreen firstScreen; private SecondScreen secondScreen; public MyMIDlet() { … }public void startApp() { Displayable current = Display.getDisplay(this).getCurrent();if (current == null) { firstScreen = new FirstScreen(this, …);Display.getDisplay(this).setCurrent(firstScreen);//显示应用程序的第一个用户界面屏幕} else { Display.getDisplay(this).setCurrent(current);} } // FirstScreen 回调切换到下一个屏幕public void firstScreenDone() { … secondScreen = new SecondScreen(this, …);display.getDisplay(this).setCurrent(secondScreen);} // SecondScreen回调终止应用程序public void secondScreenQuit() { … destroyApp(false);notifyDestroyed();}… } |
Class FirstScreen extends Form implements CommandListener { private MyMIDlet midlet;public FirstScreen(MyMIDlet midlet) { this.midlet = midlet;… }public void commandAction(Command c) { if (c == cmdQuit){ parent.firstScreenDone();}…} … } |
package example.tictactoe;import java.io.IOException;import javax.microedition.midlet.*;import javax.microedition.lcdui.*;import javax.microedition.io.*;public class TicTacToeMIDlet extends MIDlet { private ChoosePieceScreen choosePieceScreen;private GameScreen gameScreen;public TicTacToeMIDlet() { }public void startApp() { Displayable current = Display.getDisplay(this).getCurrent();if (current == null) { // first time we've been called // Get the logo image Image logo = null;try{ logo = Image.createImage("/tictactoe.png");}catch (IOException e) { // just use null image}Alert splashScreen = new Alert(null, "Tic-Tac-Toe Forum Nokia", logo, AlertType.INFO);splashScreen.setTimeout(4000);// 4 seconds choosePieceScreen = new ChoosePieceScreen(this);Display.getDisplay(this).setCurrent(splashScreen, choosePieceScreen);}else { Display.getDisplay(this).setCurrent(current);}}public void pauseApp() { }public void destroyApp(boolean unconditional) { }public void quit() { destroyApp(false);notifyDestroyed();}public void choosePieceScreenDone(boolean isPlayerCircle){ gameScreen = new GameScreen(this, isPlayerCircle);Display.getDisplay(this).setCurrent(gameScreen);}} |
package example.tictactoe;import javax.microedition.midlet.*;import javax.microedition.lcdui.*;import javax.microedition.io.*;public class ChoosePieceScreen extends List implements CommandListener { private static final String CIRCLE_TEXT = "Circle";private static final String CROSS_TEXT = "Cross";private final TicTacToeMIDlet midlet;private final Command quitCommand;public ChoosePieceScreen(TicTacToeMIDlet midlet) { super("Choose your piece", List.IMPLICIT);this.midlet = midlet;append(CIRCLE_TEXT, loadImage("/circle.png"));append(CROSS_TEXT, loadImage("/cross.png"));quitCommand = new Command("Quit", Command.EXIT, 2);addCommand(quitCommand);setCommandListener(this);}public void commandAction(Command c, Displayable d) { boolean isPlayerCircle = getString(getSelectedIndex()).equals(CIRCLE_TEXT);if (c == List.SELECT_COMMAND) { midlet.choosePieceScreenDone(isPlayerCircle);}else // quit Command { midlet.quit();}}private Image loadImage(String imageFile){ Image image = null;try { image = Image.createImage(imageFile);}catch (Exception e) { // Use a 'null' image in the choice list (i.e. text only choices). }return image;}} |
package example.tictactoe;import java.util.Random;import javax.microedition.midlet.*;import javax.microedition.lcdui.*;class GameScreen extends Canvas implements CommandListener { private static final int BLACK = 0x00000000;private static final int WHITE = 0x00FFFFFF;private static final int RED = 0x00FF0000;private static final int BLUE = 0x000000FF;private static final int NO_MOVE = -1;private final TicTacToeMIDlet midlet;private final Game game;private final Command exitCommand;private final Command newGameCommand;private final Random random = new Random();private int screenWidth, screenHeight;private int boardCellSize, boardSize, boardTop, boardLeft;private boolean playerIsCircle;private boolean computerIsCircle;private int preCursorPosition, cursorPosition;private int computerMove = NO_MOVE;private int playerMove = NO_MOVE;private int computerGamesWonTally = 0;private int playerGamesWonTally = 0;private boolean isRestart;public GameScreen(TicTacToeMIDlet midlet, boolean playerIsCircle) { this.midlet = midlet;this.playerIsCircle = playerIsCircle;computerIsCircle = !playerIsCircle;game = new Game(random);initializeBoard();// configure Screen commands exitCommand = new Command("Exit", Command.EXIT, 1);newGameCommand = new Command("New", Command.SCREEN, 2);addCommand(exitCommand);addCommand(newGameCommand);setCommandListener(this);// begin the game play initialize();}// Initialize the Game and Game screen. Also used for game restarts.private void initialize() { game.initialize();preCursorPosition = cursorPosition = 0;playerMove = NO_MOVE;boolean computerFirst = ((random.nextInt() & 1) == 0);if (computerFirst) { computerMove = game.makeComputerMove();}else { computerMove = NO_MOVE;}isRestart = true;repaint();}public void paint(Graphics g) { if (game.isGameOver()) { paintGameOver(g);}else { paintGame(g);}}private void paintGame(Graphics g) { if (isRestart) { // clean the canvas g.setColor(WHITE);g.fillRect(0, 0, screenWidth, screenHeight);drawBoard(g);isRestart = false;}drawCursor(g);if (playerMove != NO_MOVE) { drawPiece(g, playerIsCircle, playerMove);}if (computerMove != NO_MOVE) { drawPiece(g, computerIsCircle, computerMove);}}private void paintGameOver(Graphics g) { String statusMsg = null;if(game.isComputerWinner()) { statusMsg = "I win !";computerGamesWonTally++;}else if (game.isPlayerWinner()) { statusMsg = "You win";playerGamesWonTally++;}else { statusMsg = "Stalemate";}String tallyMsg = "You:" + playerGamesWonTally + " Me:" + computerGamesWonTally;Font font = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM);int strHeight = font.getHeight();int statusMsgWidth = font.stringWidth(statusMsg);int tallyMsgWidth = font.stringWidth(tallyMsg);int strWidth = tallyMsgWidth;if (statusMsgWidth > tallyMsgWidth) { strWidth = statusMsgWidth;}// Get the { x, y}position for painting the strings. int x = (screenWidth - strWidth) / 2;x = x < 0 ? 0 : x;int y = (screenHeight - 2 * strHeight) / 2;y = y < 0 ? 0 : y;// clean the canvas g.setColor(WHITE);g.fillRect(0, 0, screenWidth, screenHeight);// paint the strings' text g.setColor(BLACK);g.drawString(statusMsg, x, y, (Graphics.TOP | Graphics.LEFT));g.drawString(tallyMsg, x, (y + 1 + strHeight), (Graphics.TOP | Graphics.LEFT));}public void commandAction(Command c, Displayable d) { if (c == exitCommand) { midlet.quit();}else if (c == newGameCommand) { initialize();}}private void initializeBoard() { screenWidth = getWidth();screenHeight = getHeight();if (screenWidth > screenHeight) { boardCellSize = (screenHeight - 2) / 3;boardLeft = (screenWidth - (boardCellSize * 3)) / 2;boardTop = 1;}else { boardCellSize = (screenWidth - 2) / 3;boardLeft = 1;boardTop = (screenHeight - boardCellSize * 3) / 2;}}protected void keyPressed(int keyCode) { // can't continue playing until the player restarts if (game.isGameOver()) { return;}int gameAction = getGameAction(keyCode);switch (gameAction) { case FIRE: doPlayerMove();break;case RIGHT: doMoveCursor(1, 0);break;case DOWN: doMoveCursor(0, 1);break;case LEFT: doMoveCursor(-1, 0);break;case UP: doMoveCursor(0, -1);break;default: break;}}private void doPlayerMove() { if (game.isFree(cursorPosition)) { // player move game.makePlayerMove(cursorPosition);playerMove = cursorPosition;// computer move if (!game.isGameOver()) { computerMove = game.makeComputerMove();}repaint();}}private void doMoveCursor(int dx, int dy) { int newCursorPosition = cursorPosition + dx + 3 * dy;if ((newCursorPosition >= 0) && (newCursorPosition < 9)) { preCursorPosition = cursorPosition;cursorPosition = newCursorPosition;repaint();}}// Draw a CIRCLE or CROSS piece on the board private void drawPiece(Graphics g, boolean isCircle, int pos) { int x = ((pos % 3) * boardCellSize) + 3;int y = ((pos / 3) * boardCellSize) + 3;if (isCircle) { drawCircle(g, x, y);}else { drawCross(g, x, y);}}// Draw blue CIRCLE onto the board image private void drawCircle(Graphics g, int x, int y) { g.setColor(BLUE);g.fillArc(x + boardLeft, y + boardTop, boardCellSize - 4, boardCellSize - 4, 0, 360);g.setColor(WHITE);g.fillArc(x + 4 + boardLeft, y + 4 + boardTop, boardCellSize - 4 - 8, boardCellSize - 4 - 8, 0, 360);}// Draw red CROSS onto the board image private void drawCross(Graphics g, int x, int y) { g.setColor(RED);for (int i = 0;i < 4;i++) { g.drawLine(x + 1 + i + boardLeft, y + boardTop, x + boardCellSize - 4 - 4 + i + boardLeft, y + boardCellSize - 5 + boardTop);g.drawLine(x + 1 + i + boardLeft, y + boardCellSize - 5 + boardTop, x + boardCellSize - 4 - 4 + i + boardLeft, y + boardTop);}}// Visually indicates a Player selected square on the board image private void drawCursor(Graphics g) { // draw cursor at selected Player square. g.setColor(WHITE);g.drawRect(((preCursorPosition % 3) * boardCellSize) + 2 + boardLeft, ((preCursorPosition/3) * boardCellSize) + 2 + boardTop, boardCellSize - 3, boardCellSize - 3);// draw cursor at selected Player square. g.setColor(BLACK);g.drawRect(((cursorPosition % 3) * boardCellSize) + 2 + boardLeft, ((cursorPosition/3) * boardCellSize) + 2 + boardTop, boardCellSize - 3, boardCellSize - 3);}private void drawBoard(Graphics g) { // clean the board g.setColor(WHITE);g.fillRect(0, 0, screenWidth, screenHeight);// draw the board g.setColor(BLACK);for (int i = 0;i < 4;i++) { g.fillRect(boardLeft, boardCellSize * i + boardTop, (boardCellSize * 3) + 2, 2);g.fillRect(boardCellSize * i + boardLeft, boardTop, 2, boardCellSize * 3);}}} |
package example.tictactoe;import java.util.Random;import javax.microedition.midlet.*;import javax.microedition.lcdui.*;// The game logic for TicTacToe class Game { private static final int[] WINS = { // horizontals bit(0) | bit(1) | bit(2), bit(3) | bit(4) | bit(5), bit(6) | bit(7) | bit(8), // verticals bit(0) | bit(3) | bit(6), bit(1) | bit(4) | bit(7), bit(2) | bit(5) | bit(8), // diagonals bit(0) | bit(4) | bit(8), bit(2) | bit(4) | bit(6) };private static final int DRAWN_GAME = bit(0) | bit(1) | bit(2) | bit(3) | bit(4) | bit(5) | bit(6) | bit(7) | bit(8);private int playerState;private int computerState;private Random random;Game(Random random) { this.random = random;initialize();}void initialize() { playerState = 0;computerState = 0;}boolean isFree(int position) { int bit = bit(position);return (((playerState & bit) == 0) && ((computerState & bit) == 0));}// The 'Contract' is that caller will always make valid moves. // We don't check that it's the player's turn. void makePlayerMove(int position) { playerState |= bit(position);}// The 'Contract' is that we will be called only when there is still // at least one free square. int makeComputerMove() { int move = getWinningComputerMove();if (move == -1) { // can't win move = getRequiredBlockingComputerMove();if (move == -1) { // don't need to block move = getRandomComputerMove();}}computerState |= bit(move);return move;}boolean isGameOver() { return isPlayerWinner() | isComputerWinner() | isGameDrawn();}boolean isPlayerWinner() { return isWin(playerState);}boolean isComputerWinner() { return isWin(computerState);}boolean isGameDrawn() { return (playerState | computerState) == DRAWN_GAME;}// Return a winning move if there is at least one, otherwise return -1private int getWinningComputerMove() { int move = -1;for (int i = 0;i < 9;++i) { if (isFree(i) && isWin(computerState | bit(i))) { move = i;break;}}return move;}// Return a required blocking move if there is at least one (more // than one and we've inevitably lost), otherwise return -1 private int getRequiredBlockingComputerMove() { int move = -1;for (int i = 0;i < 9;++i) { if (isFree(i) && isWin(playerState | bit(i))) { move = i;break;}}return move;}// Return a random move in a free square, // or return -1 if none are available private int getRandomComputerMove() { int move = -1;// determine how many possible moves there are int numFreeSquares = 0;for (int i = 0;i < 9;++i) { if (isFree(i)) { numFreeSquares++;}}// if there is at least one possible move, pick randomly if (numFreeSquares > 0) { // shift twice to get rid of sign bit, then modulo numFreeSquares int pick = ((random.nextInt()<<1)>>>1) % numFreeSquares;// now find the chosen free square by counting pick down to zero for (int i = 0;i < 9;++i) { if (isFree(i)) { if (pick == 0) { move = i;break;}pick--;}}}return move;}private static boolean isWin(int state) { boolean isWinner = false;for (int i = 0;i < WINS.length;++i) { if ((state & WINS[i]) == WINS[i]) { isWinner = true;break;}}return isWinner;}private static int bit(int i) { return 1 << i;}} |
MIDlet-Name: TicTacToe MIDlet-Vendor: Forum Nokia MIDlet-Version: 1.1.1 MIDlet-Jar-Size: 11409 MIDlet-Jar-URL: TicTacToe.jar MIDlet-1: TicTacToe, /tictactoe.png, example.tictactoe.TicTacToeMIDlet |
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