鲲鹏it教育android课件游戏开发项目

Android游戏开发游戏开发视图让游戏主角动起来碰撞检测课程安排游戏周边自定义动画游戏开发视图回顾ViewpublicclassMyViewextendsView{…}protectedvoidonDraw(Canvascanvas){Paintpaint=newPaint();paint.setColor(Color.WHITE);canvas.drawText("Game",textX,textY,paint);super.onDraw(canvas);}publicbooleanonKeyDown(intkeyCode,KeyEventevent){if(keyCode==KeyEvent.KEYCODE_DPAD_UP){textY-=2;}elseif(keyCode==KeyEvent.KEYCODE_DPAD_DOWN){textY+=2;}elseif(keyCode==KeyEvent.KEYCODE_DPAD_LEFT){textX-=2;}elseif(keyCode==KeyEvent.KEYCODE_DPAD_RIGHT){textX+=2;}invalidate();//postInvalidate();returnsuper.onKeyDown(keyCode,event);}publicbooleanonTouchEvent(MotionEventevent){//获取用户手指触屏的X坐标赋值与文本的X坐标textX=(int)event.getX();//获取用户手指触屏的Y坐标赋值与文本的Y坐标textY=(int)event.getY();//重绘画布invalidate();//postInvalidate();returntrue;}1、继承android.view.View类。2、实现OnDraw方法，该方法被系统调用3、在事件处理函数中加入invalidate函数，重绘view。4、在Activity类中，使用setContentView(newMyView(this));游戏开发视图回顾SurfaceViewpublicclassMySurfaceViewextendsSurfaceViewimplementsCallback,Runnable{//用于控制SurfaceViewprivateSurfaceHoldersfh;//声明一条线程privateThreadth;//线程消亡的标识位privatebooleanflag;…}publicMySurfaceView(Contextcontext){super(context);//实例SurfaceHoldersfh=this.getHolder();//为SurfaceView添加状态监听sfh.addCallback(this);paint=newPaint();paint.setColor(Color.WHITE);//设置焦点setFocusable(true);}publicvoidsurfaceCreated(SurfaceHolderholder){flag=true;//实例线程th=newThread(this);//启动线程th.start();}publicvoidsurfaceDestroyed(SurfaceHolderholder){flag=false;}publicvoidmyDraw(){try{canvas=sfh.lockCanvas();if(canvas!=null){canvas.drawRGB(0,0,0);canvas.drawText("Game",textX,textY,paint);}}catch(Exceptione){}finally{if(canvas!=null)sfh.unlockCanvasAndPost(canvas);}}publicvoidrun(){while(flag){longstart=System.currentTimeMillis();

myDraw();logic();longend=System.currentTimeMillis();

try{if(end-start<50){

Thread.sleep(50-(end-start));

}}catch(InterruptedExceptione){ e.printStackTrace(); }}}游戏开发视图回顾1、View和SurfaceView有哪些不同更新方式不同，View是事件驱动型，SurfaceView是主动更新。

SurfaceView使用了内存缓冲区，View没有。双缓冲有益于减少画面闪烁，对于帧速高的游戏很重要。2、有哪些刷屏方法canvas.drawRect(0,0,this.getWidth(),this.getHeight(),paint);canvas.drawColor(Color.Black);canvas.drawRGB(0,0,0);

重绘背景图

View自身实现了刷屏。3、线程中加入flag的作用

back和home键会将程序切入后台。当重新激活程序时，调用顺序是：surfaceDestroy->sufaceCreated->surfaceChanged自定义动画动态位图法

不断改变位图的X轴或Y轴坐标。帧动画

导入多张图片，按一定顺序播放。见FrameMoview项目

privateBitmapfishBmp[]=newBitmap[10];publicMySurfaceView(Contextcontext){super(context);sfh=this.getHolder();sfh.addCallback(this);paint=newPaint();paint.setColor(Color.WHITE);paint.setAntiAlias(true);setFocusable(true);//将每张小鱼帧图生成位图存入小鱼帧数组中for(inti=0;i<fishBmp.length;i++){fishBmp[i]=BitmapFactory.decodeResource(this.getResources(),R.drawable.fish0+i);}}剪切图动画

类似帧动画，但所有帧放在一张图片中，设置可视区域。见ClipBitmap项目publicvoidmyDraw(){…canvas.drawBitmap(fishBmp[currentFrame],0,0,paint);…}publicvoidlogic(){…currentFrame++;If(currentFrame>=fishBmp.length)currentFrame=0;…}让游戏主角动起来准备工作 Robot.png此图是机器人向右奔跑的所有动作帧，每帧大小相同，顺序从上往下，从左到右。下标为N帧的X坐标：frameX=n%col*frameWY坐标:frameY=n/col*frameHdrawFrame函数：publicvoiddrawFrame(intcurrentFrame,Canvascanvas,Paintpaint){intframeW=bmpRobot.getWidth()/6;intframeH=bmpRobot.getHeight()/2;intcol=bmpRobot.getWidth()/frameW;intx=currentFrame%col*frameW;inty=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();}publicbooleanonKeyDown(intkeyCode,KeyEventevent){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;}returnsuper.onKeyDown(keyCode,event);}让游戏主角动起来需要按键抬起函数终止用户动作publicbooleanonKeyUp(intkeyCode,KeyEventevent){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;}returnsuper.onKeyUp(keyCode,event);}privatevoidlogic(){if(isUp){robot_y-=5;}if(isDown){robot_y+=5;}if(isLeft){robot_x-=5;}if(isRight){robot_x+=5;}currentFrame++;if(currentFrame>=12){currentFrame=0;}}碰撞检测子弹和玩家，子弹和敌机，敌机和玩家相撞，都需要碰撞检测。如果用像素循环检测，就会影响速度。矩形碰撞圆形碰撞多矩形碰撞图2图1图1图2图2图1图1图2x1:矩形1的x坐标x2:矩形2的x坐标y1:矩形1的y坐标y2:矩形2的y坐标w1:矩形1的宽 w2:矩形2的宽h1:矩形1的高 h2:矩形2的高publicbooleanisCollsionWithRect(intx1,inty1,intw1,inth1,intx2,inty2,intw2,inth2){if(x1>=x2&&x1>=x2+w2){returnfalse;}elseif(x1<=x2&&x1+w1<=x2){returnfalse;}elsei