相关疑难解决方法(0)

我正在尝试编写一个我可以在Android中使用的图形类(我知道预先存在的图形类),但转换我的所有坐标都会很痛苦.是否有一种简单的方法可以让屏幕坐标从左下方开始？

我有一个问题:我的自定义列表视图在缩放前不会滚动.缩放按预期工作.我该如何解决这个问题？

ZoomableListView:

public class ZoomableListView extends ListView {

private ScaleGestureDetector mScaleDetector;
private float mScaleFactor = 1.f;
private boolean isPagerEnabled;
private static final int INVALID_POINTER_ID = -1;

// The ‘active pointer’ is the one currently moving our object.
private int mActivePointerId = INVALID_POINTER_ID;

private float mPosX;
private float mPosY;

private float mLastTouchX;
private float mLastTouchY;

// Pivot point for Scaling
static float gx = 0, gy = 0;

public ZoomableListView(Context context, AttributeSet attrs) {
super(context, attrs);
mScaleDetector = new ScaleGestureDetector(getContext(), new …