在SurfaceView上拖动一架飞机

接上一篇在SurfaceView上拖动一张小图片
什么叫拖动飞机呢？且看


怎么样？厉害吧，飞机都能拖动。:P

public class AppView extends SurfaceView implements SurfaceHolder.Callback,Runnable,OnTouchListener{private static final String tag="AppView";private Context context;private SurfaceHolder holder;private Bitmap player;private int playerWidth,playerHeight;private int indexX,indexY;//图片的索引帧private int x,y;private Paint paint;private boolean running=true;private Rect view;//游戏视窗public AppView(Context context) {super(context);// TODO Auto-generated constructor stubthis.context=context;holder = this.getHolder();//获取holder          holder.addCallback(this);        this.setOnTouchListener(this);       }public AppView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubthis.context=context;holder = this.getHolder();//获取holder          holder.addCallback(this);        this.setOnTouchListener(this);}private void init(){                view=new Rect(this.getLeft(),this.getTop(),this.getRight(),this.getBottom());player =getImage(context,R.drawable.player);playerWidth=player.getWidth()/3;//有3帧playerHeight=player.getHeight();indexX=1;//初始化帧索引indexY=0;x=(view.width()-playerWidth)>>1;//初始化角色位置y=(view.height()-playerHeight)>>1;rect=new Rect(x,y,x+playerWidth,y+playerHeight);//图片的可拖动rectpaint=new Paint();}private void close(){}private void logic(){}private void draw(){ Canvas canvas = holder.lockCanvas();//获取画布  canvas.drawColor(Color.BLACK); canvas.save(); canvas.clipRect(rect); canvas.drawBitmap(player, rect.left-playerWidth*indexX,rect.top-playerHeight*indexY,null);// canvas.clipRect(screen); canvas.restore(); holder.unlockCanvasAndPost(canvas);// 解锁画布，提交画好的图像  }@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stubLog.i(tag, "=================surfaceCreated======================");init();running=true;new Thread(this).start();}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stubLog.i(tag, "=================surfaceDestroyed======================");running=false;close();}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stubLog.i(tag, "=================surfaceChanged======================");}@Overridepublic void run() {// TODO Auto-generated method stubint SLEEP_TIME=100;while (running) {long start=System.currentTimeMillis();logic();draw();            long end=System.currentTimeMillis();              if(end-start<SLEEP_TIME){                  try {                      Thread.sleep(SLEEP_TIME-(end-start));                  } catch (InterruptedException e) {                      // TODO Auto-generated catch block                      e.printStackTrace();                  }              }  }}//Region region=new Region();private Point point=new Point();//点击点private Rect rect;//图片的可拖动rectprivate boolean canDrag=false;//判断是否点击在图片上，否则拖动无效private int offsetX=0,offsetY=0;//点击点离图片左上角的距离private VelocityTracker tracker = null;//速度跟踪器，用于判断飞机偏左还是偏右移动@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubswitch (event.getAction()) {case MotionEvent.ACTION_DOWN:point.x=(int)event.getX();point.y=(int)event.getY();if(rect.contains(point.x, point.y)){canDrag=true;offsetX=point.x-rect.left;offsetY=point.y-rect.top;if(tracker == null){tracker = VelocityTracker.obtain();              }else{            tracker.clear();             }tracker.addMovement(event);}break;case MotionEvent.ACTION_MOVE:if(canDrag){rect.left=(int)event.getX()-offsetX;rect.top=(int)event.getY()-offsetY;rect.right=rect.left+playerWidth;rect.bottom=rect.top+playerHeight;tracker.addMovement(event);  tracker.computeCurrentVelocity(1000);float  XVelocity=tracker.getXVelocity();//Log.i(tag, "XVelocity="+XVelocity);if(XVelocity<-100){//偏左indexX=0;indexY=0;}else if(XVelocity>100){//偏右indexX=2;indexY=0;}else{indexX=1;indexY=0;}if (rect.left < 0) {  rect.left = 0;rect.right =  rect.left+playerWidth;indexX=1;indexY=0;            }              if (rect.right >  getMeasuredWidth()) {              rect.right =  getMeasuredWidth();            rect.left = rect.right-playerWidth;            indexX=1;indexY=0;            }              if (rect.top < 0) {            rect.top = 0;            rect.bottom = rect.top+playerHeight;            }              if (rect.bottom > getMeasuredHeight()) {            rect.bottom = getMeasuredHeight();            rect.top = rect.bottom-playerHeight;            }}break;case MotionEvent.ACTION_UP://case MotionEvent.ACTION_CANCEL:if(canDrag){tracker.recycle();canDrag=false;indexX=1;indexY=0;}break;default:break;}return true;}//****************************************************************************public static final Bitmap getImage(Context context, int imageId) {  return BitmapFactory.decodeResource(context.getResources(),imageId);  }  }

布局随便弄一个：
public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        AppView view=new AppView(this);
//        setContentView(view);
        setContentView(R.layout.main);
}
图片文件：



一个游戏角色在屏幕行走的demo
http://blog.csdn.net/xiaominghimi/article/details/6090631