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*/@Overridepublic 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*/@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}/*** SurfaceView视图消亡时，响应此函数*/@Overridepublic 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;}}@Overridepublic 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*/@Overridepublic 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);}@Overridepublic 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);}}