1.游戏适屏的简述和作用

由于市面上安装 Android 系统的手机不断增多，出现了各种分辨率、各种屏幕尺寸的Android 系统手机。为了保证一个游戏或者一个软件能在所有的 Android 手机上正常显示，常用的适屏做法有：利用屏幕宽高、位图宽高来设置一些游戏元素的位置；字体的适屏做法最好的使用字体图，这样文字不会因为手机分辨率不同而不同，毕竟图片大小是固定不变的。

2.让游戏主角动起来

实例演示将一张由多行多列的动作帧组成的图片实现动态效果。

 

新建项目，游戏框架为SurfaceView 框架，准备图片robot.png如下：

修改MySurfaceView 类，代码如下：

 

package com.example.ex4_13;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.view.KeyEvent;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class MySurfaceView extends SurfaceView implements Callback,Runnable {    private SurfaceHolder sfh;    private Canvas canvas;    private Paint paint;    private boolean flag;    private Thread th;    //机器人位图    private Bitmap bmpRobot ;    //机器人的方向常量    private final int DIR_LEFT =0;    private final int DIR_RIGHT=1;    //机器人当前的方向    private int dir = DIR_RIGHT;    //动作帧下标    private int currentFrame;    //机器人的X,Y位置    private int robot_x,robot_y;    //处理按键卡现象    private boolean isUp, isDown, isLeft, isRight;    public MySurfaceView(Context context) {        super(context);        sfh = this.getHolder();        sfh.addCallback(this);        paint = new Paint();        paint.setColor(Color.WHITE);        paint.setAntiAlias(true);        setFocusable(true);        bmpRobot = BitmapFactory.decodeResource(this.getResources(), R.drawable.robot);    }    /**     * SurfaceView视图创建，响应此函数     */    @Override    public void surfaceCreated(SurfaceHolder holder) {        flag = true;        //实例线程        th = new Thread(this);        //启动线程        th.start();    }        /**     * SurfaceView视图状态发生改变，响应此函数     */    @Override    public void surfaceChanged(SurfaceHolder holder, int format, int width,            int height) {            }    /**     * SurfaceView视图消亡时，响应此函数     */    @Override    public void surfaceDestroyed(SurfaceHolder holder) {        flag = false;    }    /**     * 绘制函数     */    private void myDraw()    {        try {            canvas = sfh.lockCanvas();            if(canvas!=null)            {                canvas.drawColor(Color.BLACK);                drawFrame(currentFrame,canvas,paint);            }        } catch (Exception e) {            // TODO: handle exception        }finally{            if(canvas!=null)            {                sfh.unlockCanvasAndPost(canvas);            }        }    }    /**     *      * @param currentFrame 绘制帧     * @param frameW       *             每帧的高     * @param frameH      *             每帧的高     * @param canvas       *             画布实例     * @param paint              *              画笔实例     */    private void drawFrame(int currentFrame,Canvas canvas,Paint paint)    {        //每帧的宽        int frameW = bmpRobot.getWidth() / 6;        //每帧的高        int frameH = bmpRobot.getHeight() / 2;        //得到位图的列数        int col = bmpRobot.getWidth() / frameW;        //得到当前帧相对于位图的X坐标        int x = currentFrame % col * frameW;        //得到当前帧相对于位图的Y坐标        int y = currentFrame / col * frameH;        canvas.save();        //设置一个宽高与机器人每帧相同大小的可视区域        canvas.clipRect(robot_x, robot_y, robot_x + bmpRobot.getWidth() / 6, robot_y + bmpRobot.getHeight() / 2);        if (dir == DIR_LEFT) {
   //如果是向左侧移动            //镜像操作 - 反转 - 改变机器人动画的朝向            canvas.scale(-1, 1, robot_x - x + bmpRobot.getWidth() / 2, robot_y - y + bmpRobot.getHeight() / 2);        }        canvas.drawBitmap(bmpRobot, robot_x - x, robot_y - y, paint);        canvas.restore();    }    /**     * 游戏逻辑     */    private void logic() {        //控制机器人位移方向        if (isUp) {            robot_y -= 5;        }        if (isDown) {            robot_y += 5;        }        if (isLeft) {            robot_x -= 5;        }        if (isRight) {            robot_x += 5;        }        //动作帧数的循环控制，让其动作帧不断重复播放        currentFrame++;        if (currentFrame >= 12) {            currentFrame = 0;        }    }        @Override    public void run() {        while (flag) {            long start = System.currentTimeMillis();            myDraw();            logic();            long end = System.currentTimeMillis();            try {                if (end - start < 50) {                    Thread.sleep(50 - (end - start));                }            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }    /**     * 按键事件监听     */    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {            isUp = true;        }        if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {            isDown = true;        }        if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {            isLeft = true;            dir = DIR_LEFT;        }        if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {            isRight = true;            dir = DIR_RIGHT;        }        return super.onKeyDown(keyCode, event);    }    @Override    public boolean onKeyUp(int keyCode, KeyEvent event) {        if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {            isUp = false;        }        if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {            isDown = false;        }        if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {            isLeft = false;        }        if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {            isRight = false;        }        return super.onKeyUp(keyCode, event);    }        }

 

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