贪吃蛇Android

来源：互联网发布：东方网络停牌是好是坏编辑：程序博客网时间：2024/06/05 03:06

大家好，今天我来给大家带来贪吃蛇的实现思路，这里我是采用二级缓存的策略来实现背景，蛇身和食物的绘制，操作图片实现蛇身的移动.好了见下图：
这里写图片描述
这就是最后的效果图，其中的笑脸表情是在QQ的安装包中找到的。
1.要搞清楚手势，这里采用的是SimpleOnGestureListener的监听实现类，这里我重写了
SimpleOnGestureListeneronFling（）方法，在这里控制蛇身的移动方向

    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {        //确定方向        float x = e2.getX() - e1.getX();        float y = e2.getY() - e1.getY();        if (Math.abs(x) > Math.abs(y)) {            //x方向的手势            if (x > 0) {                right();            } else {                left();            }        } else {            //y轴方向            if (y > 0) {                down();            } else {                up();            }        }        return super.onFling(e1, e2, velocityX, velocityY);    }

//food

class Food {    //食物的坐标位置    private Point mFoodPoint;    private Random mRandom;    public final int size = mSize;    private Bitmap mIcon;    public Food() {        mRandom = new Random();        mFoodPoint = new Point(mRandom.nextInt(mBg.getWidth() - size), mRandom.nextInt(mBg.getHeight() - size));        mIcon = listBiaoqing.get(myRandom.nextInt(listBiaoqing.size()));    }    public void changeFood() {        mFoodPoint.setX(mRandom.nextInt(mBg.getWidth() - size));        mFoodPoint.setY(mRandom.nextInt(mBg.getHeight() - size));        mIcon = listBiaoqing.get(myRandom.nextInt(listBiaoqing.size()));    }

//绘制食物

    public void drawFoodPoint() {        mCanvas.drawBitmap(mIcon, mFood.mFoodPoint.getX(), mFood.mFoodPoint.getY(), mPaint);    }}//userclass User {    private LinkedList<Point> mUserList;    private LinkedList<Bitmap> mUserIcon;    public User() {        mUserList = new LinkedList<>();        mUserIcon = new LinkedList<>();        Bitmap b = listBiaoqing.get(myRandom.nextInt(listBiaoqing.size()));        Point point = new Point(mSize, mSize);        mUserList.addFirst(point);        mUserIcon.addFirst(b);    }

//绘制蛇身

    public void drawUserPoint() {        for (int i = 0; i < mUserList.size(); i++) {            Bitmap bb = Bitmap.createScaledBitmap(mUserIcon.get(i), mUserIcon.get(i).getWidth(), mUserIcon.get(i).getHeight(), true);            Point p = mUserList.get(i);            mCanvas.drawBitmap(bb, p.getX(), p.getY(), mPaint);        }    }    public void reSet() {        Bitmap b = listBiaoqing.get(myRandom.nextInt(listBiaoqing.size()));        Point point = new Point(mSize, mSize);        mUserList.addFirst(point);        mUserIcon.addFirst(b);    }}

3.让蛇身移动起来

private void move() {    Point first = mUser.mUserList.getFirst();    Point last = mUser.mUserList.getLast();    switch (mState) {        case UP:            last.setX(first.getX());            last.setY(first.getY() - mSize);            break;        case DOWN:            last.setX(first.getX());            last.setY(first.getY() + mSize);            break;        case LEFT:            last.setX(first.getX() - mSize);            last.setY(first.getY());            break;        case RIGHT:            last.setX(first.getX() + mSize);            last.setY(first.getY());            break;    }    mUser.mUserList.addFirst(last);    mUser.mUserList.removeLast();}4.吃掉食物的检查public void checkEat() {    Point user = mUser.mUserList.getFirst();    float x = Math.abs(user.getX() - mFood.mFoodPoint.getX());    float y = Math.abs(user.getY() - mFood.mFoodPoint.getY());    if (x <= mSize && x >= 0) {        if (y <= mSize && y >= 0) {            //吃了            mUser.mUserIcon.addLast(listBiaoqing.get(myRandom.nextInt(listBiaoqing.size())));            Point p = mUser.mUserList.getLast();            Point now = new Point(p.getX(), p.getY());            switch (mState) {                case UP:                    now.setX(p.getX());                    now.setY(p.getY() + mSize);                    break;                case DOWN:                    now.setX(p.getX());                    now.setY(p.getY() - mSize);                    break;                case LEFT:                    now.setX(p.getX() + mSize);                    now.setY(p.getY());                    break;                case RIGHT:                    now.setX(p.getX());                    now.setY(p.getY() - mSize);                    break;            }            mUser.mUserList.addLast(now);            //改变事物            mFood.changeFood();        }    }}5.碰撞检查public boolean check() {    //是否撞到墙    Point p = mUser.mUserList.getFirst();    if (p.getX() < 0 || p.getX() > mBg.getWidth() - mSize) {        //撞墙        return true;    }    if (p.getY() < 0 || p.getY() > mBg.getHeight() - mSize) {        //撞墙        return true;    }    //是否被自己撞到了    if (mUser.mUserList.size() < 3) {        return false;    }    for (int i = 2; i < mUser.mUserList.size(); i++) {        Point point = mUser.mUserList.get(i);        float x = Math.abs(point.getX() - p.getX());        float y = Math.abs(point.getY() - p.getY());        if (x < mSize) {            if (y < mSize) {                         return true;            }        }    }        return false;}

好了，就是这几个比较重要的步骤，通过Canvas，在BitMap上绘制图形，通过不断的绘制BitMap来让蛇身动起来，最后通过SurfaceView的画布将图片绘制到View中，这样复杂的绘制工作交给图片了，减轻了View的负担，更加高效。
源码，请见https://github.com/yzzAndroid/Snake。

2 0