拖放时如何找到两个ImageView之间的相交？

Question

我有两个 ImageView

1. 一个固定在一个位置
2. 在第二我需要应用拖放功能.

我需要的:

第二个拖到ImageView另一个ImageView,当它们相交时,我需要调用一个方法.

编辑1:

相交b/w两个imageView DONE但是在拖拽上它没有发生.

编辑2:

我怎样才能实现这个目标Drag and drop？

Answer 1

I assume that you need this functionality for Android. The easiest way is to use intersects method found in Rect class. Link to documentation.

import android.graphics.Rect;

...

Rect rc1 = new Rect();
imageView1.getDrawingRect(rc1);
Rect rc2 = new Rect();
imageView2.getDrawingRect(rc2);
if (Rect.intersects(rc1, rc2)) {
  // intersection is detected
  // here is your method call
}

*EDIT added missing right bracket

Answer 2

这是我的解决方案

private boolean isViewOverlapping(View firstView, View secondView) {

        final int[] location = new int[2];

        firstView.getLocationInWindow(location);
        Rect rect1 = new Rect(location[0], location[1],location[0] + firstView.getWidth(), location[1] + firstView.getHeight());

        secondView.getLocationInWindow(location);
        Rect rect2 = new Rect(location[0], location[1],location[0] + secondView.getWidth(), location[1] + secondView.getHeight());

        return rect1.intersect(rect2);
//        return  (rect1.contains(rect2)) || (rect2.contains(rect1));
    }

调用上面的函数

@Override
    public boolean onDrag(View v, DragEvent event) {
        switch (event.getAction()) {
case DragEvent.ACTION_DROP:

if(isViewOverlapping(view,child))
                                {Toast.makeText(this,"Overlapping with "+child.getTag() or text ,Toast.LENGTH_SHORT).show();
                                }

希望这可以帮助

Answer 3

您是否已经为第二个创建了拖放功能ImageView？

如果是这样，您需要做的就是调用getLeft()、getRight() 等来找到拖动后第二个视图的位置（或者在拖动时每隔几个增量在处理程序上），然后这就变得简单了矩形相交问题，这里已经有答案了。