Android游戏开发学习①弹跳小球实现方法

bmpBack=BitmapFactory.decodeResource(r, R.drawable.back); bmpWood=BitmapFactory.decodeResource(r, R.drawable.wood);

} public void initMovables() {

Random r=new Random(); for(int i=0;i<ballNumber;i++) {

int index=r.nextInt(32); Bitmap tempBitmap=null;

if(i<ballNumber/2) { //如果是初始化前一半球，就从大球中随机找一个 tempBitmap=bitmapArray[3+index%3];

} else { //如果是初始化前一半球，就从小球中随机找一个 tempBitmap=bitmapArray[index%3];

} //创建Movable对象

Movable m=new Movable(0, 70-tempBitmap.getHeight(), tempBitmap.getWidth()/2, tempBitmap); alMovable.add(m); //加入列表中

} }

public void doDraw(Canvas canvas) { //绘制程序中需要的图片等信息 canvas.drawBitmap(bmpBack, 0, 0,null);

canvas.drawBitmap(bmpWood, 0, 60,null); for (Movable m : alMovable) { //遍历绘制每个Movable对象

m.drawSelf(canvas); }

Paint p=new Paint(); p.setColor(Color.BLUE);

p.setTextSize(18); p.setAntiAlias(true); //设置抗锯齿

canvas.drawText(fps, 30, 30, p); //画出帧速率字符串 }

@Override public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {

} @Override

public void surfaceCreated(SurfaceHolder arg0) { if(!dt.isAlive()) {

dt.start(); }

} @Override

public void surfaceDestroyed(SurfaceHolder arg0) { dt.flag=false;

dt=null; }

}