Android游戏开发中对象移动的例子

一时失言乱红尘 2022-08-05 13:10 144阅读 0赞

转载 ： [http://cwq.yfjhh.com/2009/05/android.html][http_cwq.yfjhh.com_2009_05_android.html]

该游戏对象移动，以view的背景作动画，假设开始的位置是父View坐标的(0,0)  
游戏角色view的事件监听应该在父view中监听。  
同时注意，AnimationDrawable.start()不能在Activity.onCreate事件未执行完就调用,  
但可以用在比如点击按纽后就调用等。  
  
public class Dog extends View implements OnKeyListener, Runnable \{  
         
        // 左右移动对应不同的背景动画,用这个记下当前的背景动画  
        private AnimationDrawable nowAnim;  
        // 左移动对应的背景动画  
        private AnimationDrawable animLeft;  
        // 右移动对应的背景动画  
        private AnimationDrawable animRight;  
        private View parent;  
         
        // 记下view的坐标位置，用于移动后重画该区域。该坐标是相对于父View的。  
        // 同时要注意，如果父View是有padding的，要算上，因为是以父Vew的左上角点为原点的  
        // padding最好为每次位移量的正倍数。l,t,r,b为实时的坐标位置,step为每次位移量  
        private int l=0,t=0,r=22,b=20,step=3;  
  
        public Dog(Context context, View parent) \{  
                super(context);  
                // TODO Auto-generated constructor stub  
                this.parent = parent;  
                // 记下父容器,即父View  
                 
                l += parent.getPaddingLeft(); t += parent.getPaddingTop();  
                r += parent.getPaddingRight(); b += parent.getPaddingBottom();  
                // 如果父view有padding,要算上，因为view的坐标是以父view的左上角为原点的  
                 
                // 生成左和右移动对应的背景动画,其实只是一个png,有对象移动时是的几个图片,将其分拆成移动的动画  
                animLeft = AndroidUtils.animationFromSplitImage(  
                                context, R.drawable.woniu, 22, 20, 200);  
                // 只需一个移动方向的png就行了,该animationFromSplitImage函数是将图像水来翻转。  
                animRight = AndroidUtils.animationFromSplitImage(  
                                AndroidUtils.imageFlipHorizintal(context, R.drawable.woniu), 22, 20, 200);  
                 
                setAnimationDrawable( animRight );  
                //this.setOnKeyListener( this );  
                 
        \}  
         
        private void setAnimationDrawable(AnimationDrawable anim) \{  
                if( nowAnim != null ) \{  
                        nowAnim.stop();  
                        // 必须要先stop才行，不然会影响到下一个动画的情况  
                        nowAnim = null;  
                \}  
                nowAnim = anim;  
                this.setBackgroundDrawable(nowAnim);  
        \}  
         
        // 返回当前的动画，用于在其它地方控制停止等。  
        public AnimationDrawable getBgAnimationDrawable() \{  
                return nowAnim;  
        \}  
         
        public boolean onKey(View v, int keyCode, KeyEvent event) \{  
                // TODO Auto-generated method stub  
                if( event.getAction() == KeyEvent.ACTION\_DOWN )  
                \{  
                        switch (keyCode)  
                        \{  
                        case KeyEvent.KEYCODE\_DPAD\_LEFT: \{  
                                if( getLeft()>parent.getPaddingLeft() ) \{  
                                        // 左或右位移量，是相对当前View的坐标  
                                        offsetLeftAndRight(-1\*step);  
                                        // 记下当前的坐标值，用于在父view中重画经过的区域。  
                                        l -= step;  
                                \}  
                                if( animLeft != nowAnim ) \{  
                                        setAnimationDrawable( animLeft );  
                                        nowAnim.start();  
                                \}  
                                break ;  
                        \}  
                        case KeyEvent.KEYCODE\_DPAD\_RIGHT: \{  
                                if( getRight()<(parent.getWidth() - parent.getPaddingRight()) ) \{  
                                        offsetLeftAndRight(step);  
                                        r += step;  
                                \}  
                                if( animRight != nowAnim ) \{  
                                        setAnimationDrawable( animRight );  
                                        nowAnim.start();  
                                \}  
                                break ;  
                        \}  
                        case KeyEvent.KEYCODE\_DPAD\_UP: \{  
                                if( getTop()>parent.getPaddingTop() ) \{  
                                        offsetTopAndBottom(-1\*step);  
                                        t -= step;  
                                \}  
                                break ;  
                        \}  
                        case KeyEvent.KEYCODE\_DPAD\_DOWN: \{  
                                if( getBottom()<(parent.getHeight() - parent.getPaddingBottom()) ) \{  
                                        offsetTopAndBottom(step);  
                                        b += step;  
                                \}  
                                break ;  
                        \}  
                        case KeyEvent.KEYCODE\_DPAD\_CENTER: \{  
                                break ;  
                        \}  
                        default: \{\}  
                        \}  
                        repaint();  
                \}  
                return true;  
        \}  
  
        public void run() \{  
                // TODO Auto-generated method stub  
                // 每次位移后，都重画位移前的区域的内容  
                parent.invalidate(l,t,r,b);  
        \}  
         
        public void repaint() \{  
                this.post(this);  
        \}  
\}

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