android - 以编程方式折叠 ExpandableListView 中的组

Question

当我展开一个新组时，我可以折叠最后一个展开的组吗？

Answer 1

试着把它放在你的ExpandableListAdapter,listView是对ExpandableListView自身的引用。并且lastExpandedGroupPosition是在您的ExpandableListAdapter.

    @Override
    public void onGroupExpanded(int groupPosition){
        //collapse the old expanded group, if not the same
        //as new group to expand
        if(groupPosition != lastExpandedGroupPosition){
            listView.collapseGroup(lastExpandedGroupPosition);
        }

        super.onGroupExpanded(groupPosition);           
        lastExpandedGroupPosition = groupPosition;
    }

Answer 2

非常有帮助，但正如Anh Tuan在上面的评论中提到的那样，我遇到了 ExpandableListView 的问题，然后没有滚动回当前选定组的顶部（它会停留在当前滚动的位置，在某处的组中间） . 您还需要添加一个 onGroupClickListener() 以滚动到正确的位置：

@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition,
        long id) {
    // Implement this method to scroll to the correct position as this doesn't
    // happen automatically if we override onGroupExpand() as above
    parent.smoothScrollToPosition(groupPosition);

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

    return true;
}

Answer 3

这对我有用

expandableList.setOnGroupExpandListener(new OnGroupExpandListener() {
    int previousItem = -1;

    @Override
    public void onGroupExpand(int groupPosition) {
        if(groupPosition != previousItem )
            expandableList.collapseGroup(previousItem );
        previousItem = groupPosition;
    }
});

Answer 4

这样做以展开单击的组并折叠所有其他组

public void onGroupExpand(int groupPosition)
{
    for (int i = 0; i < len; i++)
    {
        if (i != groupPosition)
        {
            expandableListDetailsLevel.collapseGroup(i);
        }
    }
}

它对我有用。

Answer 5

    @Override
    public void onGroupExpanded(int groupPosition) {
        for(int i=0;i<mGroupCollection.size();i++){
            if(i==groupPosition){
                System.out.println("Nothing");
                         }
            else{
                   mExpandableListView.collapseGroup(i);
            }

        }
        super.onGroupExpanded(groupPosition);
    }