自定义view画圆跟着鼠标移动

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public class BallView extends View{    private Paint paint;    private int cx=100;    private int cy=100;    public BallView(Context context) {        super(context);    }    public BallView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:                break;            case MotionEvent.ACTION_MOVE:                cx = (int) event.getX();                cy = (int) event.getY();                    invalidate();                break;            case MotionEvent.ACTION_UP:                break;        }        return true;    }    public BallView(Context context, AttributeSet attrs) {        super(context, attrs);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //创建一个画笔        paint = new Paint();        // 抗锯齿        paint.setAntiAlias(true);        //设置画笔的颜色        paint.setColor(Color.RED);        //设置画笔 填充是空心的        paint.setStyle(Paint.Style.FILL);        canvas.drawCircle(cx, cy, 100, paint);    }}

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