//初始化方法，里面初始化了一些常量，字体颜色等
name="code" class="java">public MainView(Context context) {super(context);Resources resources = context.getResources();//Loading resourcesgame = new MainGame(context, this);try {//Getting assetsbackgroundRectangle = resources.getDrawable(R.drawable.background_rectangle);lightUpRectangle = resources.getDrawable(R.drawable.light_up_rectangle);fadeRectangle = resources.getDrawable(R.drawable.fade_rectangle);TEXT_WHITE = resources.getColor(R.color.text_white);TEXT_BLACK = resources.getColor(R.color.text_black);TEXT_BROWN = resources.getColor(R.color.text_brown);this.setBackgroundColor(resources.getColor(R.color.background));Typeface font = Typeface.createFromAsset(resources.getAssets(), "ClearSans-Bold.ttf");paint.setTypeface(font);paint.setAntiAlias(true);} catch (Exception e) {System.out.println("Error getting assets?");}setOnTouchListener(new InputListener(this));game.newGame();}//游戏界面的绘制@Overrideprotected void onSizeChanged(int width, int height, int oldw, int oldh) {super.onSizeChanged(width, height, oldw, oldh);getLayout(width, height);createBitmapCells();createBackgroundBitmap(width, height);createOverlays();}

MianGame游戏主要逻辑

package com.tpcstld.twozerogame;import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;import java.util.ArrayList;
import java.util.Collections;
import java.util.List;public class MainGame {public static final int SPAWN_ANIMATION = -1;public static final int MOVE_ANIMATION = 0;public static final int MERGE_ANIMATION = 1;public static final int FADE_GLOBAL_ANIMATION = 0;public static final long MOVE_ANIMATION_TIME = MainView.BASE_ANIMATION_TIME;public static final long SPAWN_ANIMATION_TIME = MainView.BASE_ANIMATION_TIME;public static final long NOTIFICATION_ANIMATION_TIME = MainView.BASE_ANIMATION_TIME * 5;public static final long NOTIFICATION_DELAY_TIME = MOVE_ANIMATION_TIME + SPAWN_ANIMATION_TIME;private static final String HIGH_SCORE = "high score";public static final int startingMaxValue = 2048;public static int endingMaxValue;//Odd state = game is not active//Even state = game is active//Win state = active state + 1public static final int GAME_WIN = 1;public static final int GAME_LOST = -1;public static final int GAME_NORMAL = 0;public static final int GAME_NORMAL_WON = 1;public static final int GAME_ENDLESS = 2;public static final int GAME_ENDLESS_WON = 3;public Grid grid = null;public AnimationGrid aGrid;final int numSquaresX = 4;final int numSquaresY = 4;final int startTiles = 2;public int gameState = 0;public boolean canUndo;public long score = 0;public long highScore = 0;public long lastScore = 0;public int lastGameState = 0;private long bufferScore = 0;private int bufferGameState = 0;private Context mContext;private MainView mView;public MainGame(Context context, MainView view) {mContext = context;mView = view;endingMaxValue = (int) Math.pow(2, view.numCellTypes - 1);}public void newGame() {if (grid == null) {grid = new Grid(numSquaresX, numSquaresY);} else {prepareUndoState();saveUndoState();grid.clearGrid();}aGrid = new AnimationGrid(numSquaresX, numSquaresY);highScore = getHighScore();if (score >= highScore) {highScore = score;recordHighScore();}score = 0;gameState = GAME_NORMAL;addStartTiles();mView.refreshLastTime = true;mView.resyncTime();mView.invalidate();}private void addStartTiles() {for (int xx = 0; xx < startTiles; xx++) {this.addRandomTile();}}private void addRandomTile() {if (grid.isCellsAvailable()) {int value = Math.random() < 0.9 ? 2 : 4;Tile tile = new Tile(grid.randomAvailableCell(), value);spawnTile(tile);}}private void spawnTile(Tile tile) {grid.insertTile(tile);aGrid.startAnimation(tile.getX(), tile.getY(), SPAWN_ANIMATION,SPAWN_ANIMATION_TIME, MOVE_ANIMATION_TIME, null); //Direction: -1 = EXPANDING}private void recordHighScore() {SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(mContext);SharedPreferences.Editor editor = settings.edit();editor.putLong(HIGH_SCORE, highScore);editor.commit();}private long getHighScore() {SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(mContext);return settings.getLong(HIGH_SCORE, -1);}private void prepareTiles() {for (Tile[] array : grid.field) {for (Tile tile : array) {if (grid.isCellOccupied(tile)) {tile.setMergedFrom(null);}}}}private void moveTile(Tile tile, Cell cell) {grid.field[tile.getX()][tile.getY()] = null;grid.field[cell.getX()][cell.getY()] = tile;tile.updatePosition(cell);}private void saveUndoState() {grid.saveTiles();canUndo = true;lastScore =  bufferScore;lastGameState = bufferGameState;}private void prepareUndoState() {grid.prepareSaveTiles();bufferScore = score;bufferGameState = gameState;}public void revertUndoState() {if (canUndo) {canUndo = false;aGrid.cancelAnimations();grid.revertTiles();score = lastScore;gameState = lastGameState;mView.refreshLastTime = true;mView.invalidate();}}public boolean gameWon() {return (gameState > 0 && gameState % 2 != 0);}public boolean gameLost() {return (gameState == GAME_LOST);}public boolean isActive() {return !(gameWon() || gameLost());}public void move(int direction) {aGrid.cancelAnimations();// 0: up, 1: right, 2: down, 3: leftif (!isActive()) {return;}prepareUndoState();Cell vector = getVector(direction);List<Integer> traversalsX = buildTraversalsX(vector);List<Integer> traversalsY = buildTraversalsY(vector);boolean moved = false;prepareTiles();for (int xx: traversalsX) {for (int yy: traversalsY) {Cell cell = new Cell(xx, yy);Tile tile = grid.getCellContent(cell);if (tile != null) {Cell[] positions = findFarthestPosition(cell, vector);Tile next = grid.getCellContent(positions[1]);if (next != null && next.getValue() == tile.getValue() && next.getMergedFrom() == null) {Tile merged = new Tile(positions[1], tile.getValue() * 2);Tile[] temp = {tile, next};merged.setMergedFrom(temp);grid.insertTile(merged);grid.removeTile(tile);// Converge the two tiles' positionstile.updatePosition(positions[1]);int[] extras = {xx, yy};aGrid.startAnimation(merged.getX(), merged.getY(), MOVE_ANIMATION,MOVE_ANIMATION_TIME, 0, extras); //Direction: 0 = MOVING MERGEDaGrid.startAnimation(merged.getX(), merged.getY(), MERGE_ANIMATION,SPAWN_ANIMATION_TIME, MOVE_ANIMATION_TIME, null);// Update the scorescore = score + merged.getValue();highScore = Math.max(score, highScore);// The mighty 2048 tileif (merged.getValue() >= winValue() && !gameWon()) {gameState = gameState + GAME_WIN; // Set win stateendGame();}} else {moveTile(tile, positions[0]);int[] extras = {xx, yy, 0};aGrid.startAnimation(positions[0].getX(), positions[0].getY(), MOVE_ANIMATION, MOVE_ANIMATION_TIME, 0, extras); //Direction: 1 = MOVING NO MERGE}if (!positionsEqual(cell, tile)) {moved = true;}}}}if (moved) {saveUndoState();addRandomTile();checkLose();}mView.resyncTime();mView.invalidate();}private void checkLose() {if (!movesAvailable() && !gameWon()) {gameState = GAME_LOST;endGame();}}private void endGame() {aGrid.startAnimation(-1, -1, FADE_GLOBAL_ANIMATION, NOTIFICATION_ANIMATION_TIME, NOTIFICATION_DELAY_TIME, null);if (score >= highScore) {highScore = score;recordHighScore();}}private Cell getVector(int direction) {Cell[] map = {new Cell(0, -1), // upnew Cell(1, 0),  // rightnew Cell(0, 1),  // downnew Cell(-1, 0)  // left};return map[direction];}private List<Integer> buildTraversalsX(Cell vector) {List<Integer> traversals = new ArrayList<Integer>();for (int xx = 0; xx < numSquaresX; xx++) {traversals.add(xx);}if (vector.getX() == 1) {Collections.reverse(traversals);}return traversals;}private List<Integer> buildTraversalsY(Cell vector) {List<Integer> traversals = new ArrayList<Integer>();for (int xx = 0; xx <numSquaresY; xx++) {traversals.add(xx);}if (vector.getY() == 1) {Collections.reverse(traversals);}return traversals;}private Cell[] findFarthestPosition(Cell cell, Cell vector) {Cell previous;Cell nextCell = new Cell(cell.getX(), cell.getY());do {previous = nextCell;nextCell = new Cell(previous.getX() + vector.getX(),previous.getY() + vector.getY());} while (grid.isCellWithinBounds(nextCell) && grid.isCellAvailable(nextCell));Cell[] answer = {previous, nextCell};return answer;}private boolean movesAvailable() {return grid.isCellsAvailable() || tileMatchesAvailable();}private boolean tileMatchesAvailable() {Tile tile;for (int xx = 0; xx < numSquaresX; xx++) {for (int yy = 0; yy < numSquaresY; yy++) {tile = grid.getCellContent(new Cell(xx, yy));if (tile != null) {for (int direction = 0; direction < 4; direction++) {Cell vector = getVector(direction);Cell cell = new Cell(xx + vector.getX(), yy + vector.getY());Tile other = grid.getCellContent(cell);if (other != null && other.getValue() == tile.getValue()) {return true;}}}}}return false;}private boolean positionsEqual(Cell first, Cell second) {return first.getX() == second.getX() && first.getY() == second.getY();}private int winValue() {if (!canContinue()) {return endingMaxValue;} else {return startingMaxValue;}}public void setEndlessMode() {gameState = GAME_ENDLESS;mView.invalidate();mView.refreshLastTime = true;}public boolean canContinue() {return !(gameState == GAME_ENDLESS || gameState == GAME_ENDLESS_WON);}
}