在此之前，先修复以往的一个bug,因为前面的MapList是通过static方法得到二维数组的，因此不论调用

public static int[][] getMap(int grade)该方法多少此，都将得到同一块二维数组的引用，如果一个改变，则应一个也会改变。而判断某一关是否过关比较的way[][]和may[][]的目标位置是否都变成了箱子，因此就会有一个bug. 解决办法，修改MapList，从三维数组重新拷贝出一个二维数组。 MapList.java

package edu.pushbox;public class MapList {    /**     * 0 nothing      * 1 wall      * 2 goal      * 3 road      * 4 box      * 5 box at goal      * 6 worker     * */        public static int[][][] map =        {            {                     { 0, 0, 1, 1, 1, 0, 0, 0 },                    { 0, 0, 1, 2, 1, 0, 0, 0 },                    { 0, 0, 1, 3, 1, 1, 1, 1 },                    { 1, 1, 1, 4, 3, 4, 2, 1 },                    { 1, 2, 3, 4, 6, 1, 1, 1 },                    { 1, 1, 1, 1, 4, 1, 0, 0 },                    { 0, 0, 0, 1, 2, 1, 0, 0 },                     { 0, 0, 0, 1, 1, 1, 0, 0 }             },            {                         { 1, 1, 1, 1, 1, 0, 0, 0, 0 },                    { 1, 6, 3, 3, 1, 0, 0, 0, 0 },                    { 1, 3, 4, 4, 1, 0, 1, 1, 1 },                    { 1, 3, 4, 3, 1, 0, 1, 2, 1 },                    { 1, 1, 1, 3, 1, 1, 1, 2, 1 },                    { 0, 1, 1, 3, 3, 3, 3, 2, 1 },                    { 0, 1, 3, 3, 3, 1, 3, 3, 1 },                    { 0, 1, 3, 3, 3, 1, 1, 1, 1 },                    { 0, 1, 1, 1, 1, 1, 0, 0, 0 }             }        };    public static int count = map.length;    public static int getCount() {        return count;    }    /*     * 判断是否到最后一关     */    public static boolean isEnd(int grade) {        if(grade==count){            return true;        }else{            return false;        }    }/* * 从MapList分离出int map[][] */    public static int[][] getMap(int grade) {        int row = map[grade].length;        int col = map[grade][0].length;        int[][] result = new int[row][col];        for (int i = 0; i < row; i++) {            for (int j = 0; j < col; j++) {                result[i][j] = map[grade][i][j];            }        }        return result;    }    /*     * CopyMap return int[][]     */    public static int[][] copyMap(int[][] src) {        int row = src.length;        int col = src[0].length;        int[][] result = new int[row][col];        for (int i = 0; i < row; i++) {            for (int j = 0; j < col; j++) {                result[i][j] = src[i][j];            }        }        return result;    }}

本节： 当某一步走错是需要有一个back返回功能，这就要记录下上一次的map存起来，当用户需要返回时，再取回。这就要求每一次推之前就要先记录当前map[][]然后再更新。特别添加map助手类。

CurrentMap.java(把map[][]包装，以便存入mapUtil中)

package edu.pushbox.util;public class CurrentMap {    private int[][] currentMap;    public int[][] getCurrentMap() {        int row = currentMap.length;        int col = currentMap[0].length;        int[][] result = new int[row][col];        for (int i = 0; i < row; i++) {            for (int j = 0; j < col; j++) {                result[i][j] = currentMap[i][j];            }        }        return result;    }    public void setCurrentMap(int[][] currentMap) {        this.currentMap = currentMap;    }    public CurrentMap(int[][] currentMap) {        int row = currentMap.length;        int col = currentMap[0].length;        int[][] result = new int[row][col];        for (int i = 0; i < row; i++) {            for (int j = 0; j < col; j++) {                result[i][j] = currentMap[i][j];            }        }        this.currentMap = result;    }}

MapUtils.java 

package edu.pushbox.util;import java.util.ArrayList;public class MapUtils {    private ArrayList
     
       list;    private int size=10;    public int getSize() {        return size;    }    public void setSize(int size) {        this.size = size;    }    private static MapUtils mapUtils = new MapUtils();    private MapUtils() {        list = new ArrayList
      
       ();    }    public static MapUtils getSingleton() {        return mapUtils;    }    /*     * 判断是否能回     */    public boolean canBack() {        boolean flag = false;        if (list.size() > 0) {            flag = true;        }        return flag;    }    /*     * 储存一步     */    public void storeOneMap(CurrentMap currentMap) {        list.add(currentMap);        if (list.size() > size) {            list.remove(0);        }    }    /*     * 退回一步     */    public CurrentMap returnBack() {        CurrentMap currentMap = list.get(list.size() - 1);        list.remove(list.size() - 1);        return currentMap;    }    /*     * 清空路     */    public void clear() {        list.clear();    }}
      
     

GameView.java

package edu.pushbox;import android.annotation.SuppressLint;import android.app.AlertDialog;import android.app.Dialog;import android.content.Context;import android.content.DialogInterface;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.util.Log;import android.view.KeyEvent;import android.view.View;import android.view.WindowManager;import android.widget.Toast;import edu.phshbox.R;import edu.pushbox.service.PreferencesService;import edu.pushbox.util.CurrentMap;import edu.pushbox.util.MapUtils;import edu.pushbox.util.Point;import edu.pushbox.util.Position;public class GameView extends View {    private int count = 0;// count    private long beginTime = 0;// time    private long currentTime = 0;// time    int width = 0;    int oxOff = 15;    int oyOff = 30;    GameMain gameMain = null;    public final int WALL = 1;// 墙    public final int GOAL = 2;// 目标    public final int ROAD = 3;// 路    public final int BOX = 4;// 锟斤拷锟斤拷    public final int BOX_AT_GOAL = 5;// 锟斤拷锟接碉拷目锟斤拷位锟斤拷    public final int WORKER = 6;//    public final int BACK = 7;    public final int UP = 8;    public final int DOWN = 9;    public final int LEFT = 10;    public final int RIGHT = 11;    public final int EXIT = 12;    public final int SETTING = 13;    private MapUtils mapUtils = MapUtils.getSingleton();;    private Point workPoint;    int wrow, wcolumn;    public static int picSize = 30;    private int map[][] = null;// 路锟斤拷位锟斤拷    private int way[][] = null;// 原始路锟斤拷位锟斤拷    private int row = 0;    private int col = 0;    private static int grade = 0;    private String[] arrayGrade = null;    private static final int GRADE = 2;    private Bitmap picture[] = null;    private PreferencesService preferencesService = null;    private int selectedGradeIndex = 0;    public GameView(Context context, AttributeSet attrs) {        super(context, attrs);        gameMain = (GameMain) context;        preferencesService = new PreferencesService(context);        WindowManager win = gameMain.getWindowManager();        width = win.getDefaultDisplay().getWidth();        grade = Integer.parseInt(preferencesService.getPreferences("grade"));        Log.d("GRADE", grade + "");        init();    }    public void init() {        initMap();        initWay();        initMapUtils();        initWorkerPosition();        initTimeAndCount();        reset();        initPicture();    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {            moveDown();        } else if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {            moveUp();        } else if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {            moveLeft();        } else if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {            moveRight();        } else if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {            if (mapUtils.canBack()) {                count--;                returnBack();            } else {                Toast.makeText(this.getContext(), "Can't return more",                        Toast.LENGTH_LONG).show();            }        }        if (Position.isSuccess(map, way, GOAL)) {            Dialog alterDialog = new AlertDialog.Builder(getContext())                    .setTitle(R.string.tip)                    .setMessage(R.string.continue_next)                    .setIcon(getResources().getDrawable(R.drawable.tip))                    .setPositiveButton(R.string.yes,                            new DialogInterface.OnClickListener() {                                @Override                                public void onClick(DialogInterface dialog,                                        int which) {                                    GameView.grade = GameView.grade + 1;                                    preferencesService.save("grade", grade);                                    // Log.d("Grade",grade+"");                                    if (MapList.isEnd(grade)) {                                        resetGrade();                                    }                                    Log.d("Grade", grade + "");                                    init();                                    initMapUtils();                                }                            })                    .setNegativeButton(R.string.no,                            new DialogInterface.OnClickListener() {                                @Override                                public void onClick(DialogInterface dialog,                                        int which) {                                }                            }).create();            alterDialog.show();        }        invalidate();        currentTime = System.currentTimeMillis();        invalidate();        return super.onKeyDown(keyCode, event);    }    private void returnBack() {        map = mapUtils.returnBack().getCurrentMap();        initWay();        initWorkerPosition();    }    /*     * 重置关数     */    private void resetGrade() {        grade = 0;    }　　/** 　　 *移动之前先保存当前路径 　　 */ private void moveDown() {        if (map[wrow + 1][wcolumn] == ROAD || map[wrow + 1][wcolumn] == GOAL) {            count++;            mapUtils.storeOneMap(new CurrentMap(map));            map[wrow + 1][wcolumn] = WORKER;            map[wrow][wcolumn] = roadOrGoal();            wrow++;            return;        } else if (map[wrow + 1][wcolumn] == BOX                || map[wrow + 1][wcolumn] == BOX_AT_GOAL) {            if (map[wrow + 2][wcolumn] == ROAD                    || map[wrow + 2][wcolumn] == GOAL) {                count++;                mapUtils.storeOneMap(new CurrentMap(map));                map[wrow + 2][wcolumn] = map[wrow + 2][wcolumn] == GOAL ? BOX_AT_GOAL                        : BOX;                map[wrow + 1][wcolumn] = WORKER;                map[wrow][wcolumn] = roadOrGoal();                wrow++;                return;            }        }    }    private void moveUp() {        if (map[wrow - 1][wcolumn] == ROAD || map[wrow - 1][wcolumn] == GOAL) {            count++;            mapUtils.storeOneMap(new CurrentMap(map));            map[wrow - 1][wcolumn] = WORKER;            map[wrow][wcolumn] = roadOrGoal();            wrow--;            return;        } else if (map[wrow - 1][wcolumn] == BOX                || map[wrow - 1][wcolumn] == BOX_AT_GOAL) {            if (map[wrow - 2][wcolumn] == ROAD                    || map[wrow - 2][wcolumn] == GOAL) {                count++;                mapUtils.storeOneMap(new CurrentMap(map));                map[wrow - 2][wcolumn] = map[wrow - 2][wcolumn] == GOAL ? BOX_AT_GOAL                        : BOX;                map[wrow - 1][wcolumn] = WORKER;                map[wrow][wcolumn] = roadOrGoal();                wrow--;                return;            }        }    }    private void moveLeft() {        if (map[wrow][wcolumn - 1] == ROAD || map[wrow][wcolumn - 1] == GOAL) {            count++;            mapUtils.storeOneMap(new CurrentMap(map));            map[wrow][wcolumn - 1] = WORKER;            map[wrow][wcolumn] = roadOrGoal();            wcolumn--;            return;        } else if (map[wrow][wcolumn - 1] == BOX                || map[wrow][wcolumn - 1] == BOX_AT_GOAL) {            if (map[wrow][wcolumn - 2] == ROAD                    || map[wrow][wcolumn - 2] == GOAL) {                count++;                mapUtils.storeOneMap(new CurrentMap(map));                map[wrow][wcolumn - 2] = map[wrow][wcolumn - 2] == GOAL ? BOX_AT_GOAL                        : BOX;                map[wrow][wcolumn - 1] = WORKER;                map[wrow][wcolumn] = roadOrGoal();                wcolumn--;                return;            }        }    }    private void moveRight() {        if (map[wrow][wcolumn + 1] == ROAD || map[wrow][wcolumn + 1] == GOAL) {            count++;            mapUtils.storeOneMap(new CurrentMap(map));            map[wrow][wcolumn + 1] = WORKER;            map[wrow][wcolumn] = roadOrGoal();            wcolumn++;            return;        } else if (map[wrow][wcolumn + 1] == BOX                || map[wrow][wcolumn + 1] == BOX_AT_GOAL) {            if (map[wrow][wcolumn + 2] == ROAD                    || map[wrow][wcolumn + 2] == GOAL) {                count++;                mapUtils.storeOneMap(new CurrentMap(map));                map[wrow][wcolumn + 2] = map[wrow][wcolumn + 2] == GOAL ? BOX_AT_GOAL                        : BOX;                map[wrow][wcolumn + 1] = WORKER;                map[wrow][wcolumn] = roadOrGoal();                wcolumn++;                return;            }        }    }    private int roadOrGoal() {        int result = ROAD;        if (way[wrow][wcolumn] == GOAL)            result = GOAL;        return result;    }    public void reset() {        row = map.length;        col = map[0].length;        picSize = (int) Math.floor((width - oxOff - oyOff) / col);    }    private void initMap() {        map = MapList.getMap(grade);    }    //    private void initTimeAndCount() {        beginTime = System.currentTimeMillis();        currentTime = System.currentTimeMillis();        count = 0;    }    /*     * copy map to way     */    private void initWay() {        way = MapList.copyMap(map);    }    /*     * getWorkPosition     */    private void initWorkerPosition() {        workPoint = Position.getPosition(map, WORKER);// 找到人的位置        wrow = workPoint.row;        wcolumn = workPoint.column;    }    /*     * initMapUtils     */    private void initMapUtils() {        mapUtils.clear();    }    private void initPicture() {        picture = new Bitmap[14];        loadPicture(WALL, R.drawable.wall);        loadPicture(GOAL, R.drawable.goal);        loadPicture(ROAD, R.drawable.road);        loadPicture(BOX, R.drawable.box);        loadPicture(BOX_AT_GOAL, R.drawable.box_at_goal);        loadPicture(WORKER, R.drawable.worker);        loadPicture(BACK, R.drawable.back);        loadPicture(UP, R.drawable.up);        loadPicture(DOWN, R.drawable.down);        loadPicture(LEFT, R.drawable.left);        loadPicture(RIGHT, R.drawable.right);        loadPicture(EXIT, R.drawable.exit);        loadPicture(SETTING, R.drawable.setting);    }    private void loadPicture(int key, int pictureId) {        Drawable drawable = getResources().getDrawable(pictureId);        Bitmap bitMap = Bitmap.createBitmap(picSize, picSize,                Bitmap.Config.ARGB_8888);        drawable.setBounds(0, 0, picSize, picSize);        Canvas canvas = new Canvas(bitMap);        drawable.draw(canvas);        picture[key] = bitMap;    }    @SuppressLint("DrawAllocation")    @Override    protected void onDraw(Canvas canvas) {        Paint paint = new Paint();        paint.setColor(Color.RED);        paint.setTextSize(14);        for (int i = 0; i < row; i++) {            for (int j = 0; j < col; j++) {                if (map[i][j] > 0)                    canvas.drawBitmap(picture[map[i][j]], oxOff + picSize * j,                            oyOff + picSize * i, paint);            }        }        canvas.drawText(getContext().getString(R.string.time) + ""                + (currentTime - beginTime) / 1000, 6, 16, paint);        canvas.drawText(getContext().getString(R.string.count) + "" + count,                190, 16, paint);        canvas.drawBitmap(picture[BACK], oxOff, oyOff + row * picSize + 20,                paint);        canvas.drawBitmap(picture[UP], oxOff + picSize, oyOff + row * picSize                + 20, paint);        canvas.drawBitmap(picture[DOWN], oxOff + 2 * picSize, oyOff + row                * picSize + 20, paint);        canvas.drawBitmap(picture[LEFT], oxOff + 3 * picSize, oyOff + row                * picSize + 20, paint);        canvas.drawBitmap(picture[RIGHT], oxOff + 4 * picSize, oyOff + row                * picSize + 20, paint);        canvas.drawBitmap(picture[EXIT], oxOff + 5 * picSize + 10, oyOff + row                * picSize + 20, paint);        canvas.drawBitmap(picture[SETTING], oxOff + 7 * picSize, oyOff + row                * picSize + 20, paint);        super.onDraw(canvas);    }}