如何保存和恢复在Android中的ExpandableListView的状态？ [英] How to save and restore the state of an ExpandableListView in Android?

问题描述

是否可以保存和恢复状态的Andr​​oid的ExpandableListView（这项目晕倒，这不是）？

Is it possible to save and restore the state (which items are collapsed and which not) of an ExpandableListView in Android?

如果有可能，我该怎么办呢？

If it is possible, how can I do that?

我可以，我可以访问ExpandableListView中的onPause（）/ onResume（）又如何呢？

Can I can I access the ExpandableListView in onPause() / onResume() and how?

推荐答案

我遍历组并保存它们的状态：

I iterate through the groups and save the state of them all:

int numberOfGroups = MyExpandableListViewAdapter.getGroupCount();
boolean[] groupExpandedArray = new boolean[numberOfGroups];
  for (int i=0;i<numberOfGroups;i++)
    groupExpandedArray[i] = MyExpandableListView.isGroupExpanded(i);

那么对于恢复状态：

Then for restore the state:

for (int i=0;i<groupExpandedArray.length;i++)
  if (groupExpandedArray[i] == true)
    MyExpandableListView.expandGroup(i);

我不明白你如何访问的onPause（）/ onResume（）在ListView的意思是，如果你的ListView的对象存储为活动类的成员应该是可从那里。

I don't understand what you mean by how to access the ListView in onPause() / onResume(), it should be accessible from there if you store the ListView object as a member of the activity class.

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