我需要一种在子视图到父视图之间进行拖放的方法。所以我会放一张图片来更好地解释:
黄色代表一个扩展RelativeLayout 的类。黑色代表一个扩展 ViewGroup 的类 白色代表 ImageViews 红色代表一个 View
所以我需要将 White Blocks(ImageViews) 放在 Yellow View 上,但我只拖过 Black View,因为 ImageView 有一个像父亲一样的 BlackView,所以我现在的解决方案是更改父亲的拖动视图,但是当我添加视图时在 YellowView 上,这会取消我的拖动事件,所以当我在视图之间切换时需要继续拖动。请注意,WhiteView 的唯一方法是放置在 RedView 上,如果 Touch up 和 White view 远离 RedView 白色块将返回 BlackView。
所以,我使用从网上获得的这段代码:
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
touchDown(event);
break;
case MotionEvent.ACTION_MOVE:
touchMove(event);
break;
case MotionEvent.ACTION_UP:
touchUp(event);
break;
}
if (aViewIsDragged())
return true;
return false;
}
private void touchDown(MotionEvent event) {
initialX = (int)event.getRawX();
initialY = (int)event.getRawY();
lastTouchX = (int)event.getRawX() + (gridPageWidth);
lastTouchY = (int)event.getRawY();
}
public boolean onLongClick(View v) {
if(positionForView(v) != -1) {
movingView = true;
dragged = positionForView(v);
return true;
}
return false;
}
private void touchMove(MotionEvent event) {
if (movingView && aViewIsDragged()) {
lastTouchX = (int) event.getX();
lastTouchY = (int) event.getY();
moveDraggedView(lastTouchX, lastTouchY);
manageSwapPosition(lastTouchX, lastTouchY);
manageEdgeCoordinates(lastTouchX);
manageDeleteZoneHover(lastTouchX, lastTouchY);
}
}
private void moveDraggedView(int x, int y) {
ImageView child = null;
View childAt = getChildAt(dragged);
int width = childAt.getMeasuredWidth();
int height = childAt.getMeasuredHeight();
int left = x - (1 * width / 2);
int t = y - (1 * height / 2);
childAt.layout(left, t, left + width, t + height);
//TODO at this point if left less than 0, I detect part of view is out and I need to change this view to Yello
if (left <0){
child = (ImageView) childAt;
ViewGroup parent = (ViewGroup) getParent();
cloneimage = new ImageView(getContext());
cloneimage.setBackgroundDrawable(child.getDrawable());
parent.addView(cloneimage);
}
}
所以我认为这有点困难,但如果有人帮助我将 WhiteView 从 Black 更改为 Yellow 并继续拖动,我会很感激。
谢谢!