重新排列Framelayout android上的视图顺序

Question

我在 frameLayout 上添加了五个视图。

如何重新排列framelayout的childIndex。

我使用以下代码：

fromindex  = 3;
toindex    = 4;
View tempFrom = frameLayout.getChildAt(fromindex);
View tempTo   = frameLayout.getChildAt(toindex);
frameLayout.removeViewAt(fromindex)
frameLayout.removeViewAt(toindex)
frameLayout.addView(tempFrom, toindex)
frameLayout.addView(tempTo,fromindex)

但它会引发以下错误。

java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

framelayout的childindex如何重新排列？

Answer 1

如何重新排列framelayout的childIndex。

FrameLayout 无法直接重新排列其子级，但您可以通过删除这些子级并将它们重新添加到正确的位置来实现。您的代码不起作用，因为您以错误的顺序删除了视图，导致视图仍附加到父级：

fromindex  = 3;
toindex    = 4;
View tempFrom = frameLayout.getChildAt(fromindex);
View tempTo   = frameLayout.getChildAt(toindex);
// first remove the view which is above in the parent's stack
// otherwise, if you remove the other child you'll call the `removeViewAt`
// method with the wrong index and the view which was supposed to be detached
// from the parent is still attached to it
frameLayout.removeViewAt(toindex);
frameLayout.removeViewAt(fromindex);
// first add the child which is lower in the hierarchy so you add the views
// in the correct order
frameLayout.addView(tempTo,fromindex)
frameLayout.addView(tempFrom, toindex)

Answer 2

试试这个代码

frameLayout.removeView(tempFrom) //to remove views
frameLayout.removeView(tempTo)

Answer 3

我认为你不能交换意见。您需要定义新的视图组并膨胀到他的父级并删除旧的。

View C = findViewById(R.id.C);
ViewGroup parent = (ViewGroup) C.getParent();
int index = parent.indexOfChild(C);
parent.removeView(C);
C = getLayoutInflater().inflate(optionId, parent, false);
parent.addView(C, index);