Android 2048的设计

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假期时无意间在微信上看到有人转发了2048的游戏链接，就想试着自己写一个，于是用了五天的时间完成了这个小游戏

游戏截图如下：

这里写图片描述

整个游戏的基础功能的实现十分简单，仅需要用到三个类，分别是卡片类:Card.java，游戏界面组件:GameView.java，主Activity类:MainActivity。

Card类用来生成游戏中的每个方格，继承了FrameLayout，所以Card也是一个布局类，当中包含了一个TextView组件，用来显示每个方格的数值Num，并提供了getNum()和setNum()来设置和获取其数值。代码如下：

public class Card extends FrameLayout {    private TextView label;    private int num;    public Card(Context context) {        super(context);        label = new TextView(getContext());        label.setBackgroundColor(0x33ffffff);        label.setTextSize(32);        label.setGravity(Gravity.CENTER);        LayoutParams lp = new LayoutParams(-1, -1);        lp.setMargins(10, 10, 0, 0);        addView(label, lp);    }    public int getNum() {        return num;    }    public void setNum(int num) {        this.num = num;        if (num == 0) {            label.setText("");            return;        }        label.setText(num + "");    }    public boolean equals(Card c) {        return this.getNum() == c.getNum();    }}

GameView类用来生成游戏的主界面，继承了GridLayout类，所以GameView也是一个布局类。因为2048的游戏区域是一个n行n列的正方形区域，则GameView当中即包含了n*n个Card对象。通过设定每个方格的数值变化即可实现相应的“左移”，“右移”，“合并”等多种操作。
该注意的是，当手指向左滑动时，要实现全部方块向左移动，相邻且数值相同的方块要合并在一起，实现方法是LeftCard()。Left()函数用来实现所有方块向左移动的功能，但不包括数值检测与合并。LeftCard()方法首先执行一次Left()，然后从左往右检测是否有相邻方法数值相同，有则合并，且再执行一次Left()。代码如下：

public class GameView extends GridLayout {    private Card[][] cards;    public GameView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    public GameView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public GameView(Context context) {        super(context);        init();    }    //初始化    public void init() {        setBackgroundColor(0xffbbada0);        cards = new Card[4][4];        for (int y = 0; y < 4; y++) {            for (int x = 0; x < 4; x++) {                cards[x][y] = new Card(getContext());            }        }        RandomCard();        RandomCard();    }    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        int cardWidth = (Math.min(w, h) - 10) / 4;        addCard(cardWidth);    }    public void addCard(int cardWidth) {        for (int y = 0; y < 4; y++) {            for (int x = 0; x < 4; x++) {                addView(cards[x][y], cardWidth, cardWidth);            }        }    }    //生成随机数字    public void RandomCard() {        int i = 0;        for (int x = 0; x < 4; x++) {            for (int y = 0; y < 4; y++) {                if (cards[x][y].getNum() == 0) {                    i++;                }            }        }        if (i == 0) {            return;        }        int random = new Random().nextInt(16);        int x = random / 4;        int y = random % 4;        while (cards[x][y].getNum() != 0) {            random = new Random().nextInt(16);            x = random / 4;            y = random % 4;        }        cards[x][y].setNum(2);    }    //左移    public void LeftCard() {        Left();        for (int y = 0; y < 4; y++) {            for (int x = 0; x < 3; x++) {                if (cards[x][y].getNum() != 0) {                    if (cards[x][y].equals(cards[x + 1][y])) {                        int num = 2 * cards[x][y].getNum();                        cards[x][y].setNum(num);                        cards[x + 1][y].setNum(0);                        Left();                    }                }            }        }        RandomCard();    }    //右移    public void RightCard() {        Right();        for (int y = 0; y < 4; y++) {            for (int x = 3; x > 0; x--) {                if (cards[x][y].getNum() != 0) {                    if (cards[x][y].equals(cards[x - 1][y])) {                        int num = 2 * cards[x][y].getNum();                        cards[x][y].setNum(num);                        cards[x - 1][y].setNum(0);                        Right();                    }                }            }        }        RandomCard();    }    //上移    public void TopCard() {        Top();        for (int x = 0; x < 4; x++) {            for (int y = 0; y < 3; y++) {                if (cards[x][y].getNum() != 0) {                    if (cards[x][y].equals(cards[x][y + 1])) {                        int num = 2 * cards[x][y].getNum();                        cards[x][y].setNum(num);                        cards[x][y + 1].setNum(0);                        Top();                    }                }            }        }        RandomCard();    }    //下移    public void BottomCard() {        Bottom();        for (int x = 0; x < 4; x++) {            for (int y = 3; y > 0; y--) {                if (cards[x][y].getNum() != 0) {                    if (cards[x][y].equals(cards[x][y - 1])) {                        int num = 2 * cards[x][y].getNum();                        cards[x][y].setNum(num);                        cards[x][y - 1].setNum(0);                        Bottom();                    }                }            }        }        RandomCard();    }    //全部向左    public void Left() {        for (int y = 0; y < 4; y++) {            int i = 0;            for (int x = 0; x < 4; x++) {                if (cards[x][y].getNum() != 0) {                    int num = cards[x][y].getNum();                    cards[x][y].setNum(0);                    cards[i++][y].setNum(num);                }            }        }    }    //全部向右    public void Right() {        for (int y = 0; y < 4; y++) {            int i = 3;            for (int x = 3; x > -1; x--) {                if (cards[x][y].getNum() != 0) {                    int num = cards[x][y].getNum();                    cards[x][y].setNum(0);                    cards[i--][y].setNum(num);                }            }        }    }    //全部向上    public void Top() {        for (int x = 0; x < 4; x++) {            int i = 0;            for (int y = 0; y < 4; y++) {                if (cards[x][y].getNum() != 0) {                    int num = cards[x][y].getNum();                    cards[x][y].setNum(0);                    cards[x][i++].setNum(num);                }            }        }    }    //全部向下    public void Bottom() {        for (int x = 0; x < 4; x++) {            int i = 3;            for (int y = 3; y > -1; y--) {                if (cards[x][y].getNum() != 0) {                    int num = cards[x][y].getNum();                    cards[x][y].setNum(0);                    cards[x][i--].setNum(num);                }            }        }    }    //屏幕触摸事件    float X;    float Y;    float OffsetX;    float OffsetY;    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()) {        case MotionEvent.ACTION_DOWN:            X = event.getX();            Y = event.getY();            break;        case MotionEvent.ACTION_UP:            OffsetX = event.getX() - X;            OffsetY = event.getY() - Y;            if (Math.abs(OffsetX) > (Math.abs(OffsetY))) {                if (OffsetX < -5) {                    LeftCard();                } else if (OffsetX > 5) {                    RightCard();                }            } else {                if (OffsetY < -5) {                    TopCard();                } else if (OffsetY > 5) {                    BottomCard();                }            }            break;        }        return true;    }}

这样，向主Activity设置的布局文件activity_main.xml中增添GameView组件，就可以实现游戏的基本功能了。代码如下：

<?xml version="1.0"?><LinearLayout xmlns:tools="http://schemas.android.com/tools"    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context=".MainActivity" >    <chen.zy.game2048.GameView        android:id="@+id/gameView"        android:layout_width="fill_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:columnCount="4"        android:rowCount="4" >    </chen.zy.game2048.GameView></LinearLayout>

仅依靠这三个类，就可以实现2048的基础功能，代码虽然简洁，但实现的效果肯定也没有我上述的截图好，其他功能需要自己再来后续添加，如保存游戏记录、音效、主题等。
这里提供代码下载地址：Android游戏——2048源码

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