android - 折叠组在多级可扩展 ListView 中不起作用

Question

我有一个多级 ExpandableListView。我一次只需要扩展一个项目。在第二关，我用过这个方法，但是没有用:

simpleExpandableListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {
    @Override
    public void onGroupExpand(int groupPosition) {
        if (lastExpandedPositions != -1 && groupPosition != lastExpandedPositions) {
            simpleExpandableListView.collapseGroup(lastExpandedPositions);
            // getChildView
        }
        lastExpandedPositions = groupPosition;
    }
});

为什么方法 collapseGroup(lastExpandedPositions) 没有响应？有人可以帮忙吗？？

Answer 1

我的问题已解决，答案在下面的代码中我将此代码添加到一级可扩展列表适配器的 getchildView() 方法中:

int  lastExpandedPositions=-1;

simpleExpandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
                @Override
                public boolean onGroupClick(ExpandableListView parent, View view,
                                            int groupPosition, long id) {

                    setListViewHeight(parent, groupPosition);

                       parent.smoothScrollToPosition(groupPosition);

                    // Need default behaviour here otherwise group does not get expanded/collapsed
                    if (parent.isGroupExpanded(groupPosition)) {
                        parent.collapseGroup(groupPosition);

                    } else {
                        parent.expandGroup(groupPosition);
                        if (lastExpandedPositions != -1
                                && groupPosition != lastExpandedPositions) {
                          parent.collapseGroup(lastExpandedPositions);



                        }
                        lastExpandedPositions = groupPosition;
                    }

                    return true;
                }
            });