我有一个使用BaseExpandableListAdapter
的自定义适配器填充的ExpandableListView
。我可以在新活动中添加新数据,然后我必须刷新列表。当清单刷新时,我想保持相同的组展开。添加数据时刷新ExpandableListView:保持状态
可以在列表中的任意位置添加新条目。我们可以添加新的小组或仅添加新的小孩。
现在我使用:
adapter.notifyDataSetChanged();
列表将刷新,但国家是不一样的。例如,如果我有三组:G1展开,G2未展开,G3展开,并且我在G2和G3之间添加了一个新的组G4,则G4从其位置开始获取G3状态。有没有办法自动保持状态,或者我必须在我的适配器中手动执行?
谢谢!
[编辑]
添加一些代码。
这是我的适配器:
public class StopsInnerExpandableListAdapter extends BaseExpandableListAdapter {
private ArrayList<String> groups; // Dates.
private ArrayList<ArrayList<HashMap<String, String>>> children; // HashMap has stop ID, image and price.
private Context context;
public StopsInnerExpandableListAdapter (Context ctx, ArrayList<String> groups,
ArrayList<ArrayList<HashMap<String, String>>> children) {
context = ctx;
this.groups = groups;
this.children = children;
}
@Override
public boolean areAllItemsEnabled() {
return true;
}
public HashMap<String, String> getChild(int groupPosition, int childPosition) {
return children.get(groupPosition).get(childPosition);
}
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
if (convertView == null) {
// Inflate child's view.
LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.stop_row, null);
}
// Get the stop data and use it to fill the child's views.
HashMap<String, String> child = children.get(groupPosition).get(childPosition);
...
return convertView;
}
public int getChildrenCount(int groupPosition) {
return children.get(groupPosition).size();
}
public String getGroup(int groupPosition) {
return groups.get(groupPosition);
}
public int getGroupCount() {
return groups.size();
}
public long getGroupId(int groupPosition) {
return groupPosition;
}
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
if (convertView == null) {
// Inflate group's view.
LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.stop_subgroup, null);
}
String date = groups.get(groupPosition);
TextView dateView = (TextView) convertView.findViewById(R.id.title_date);
dateView.setText(date);
return convertView;
}
public boolean hasStableIds() {
return true;
}
public boolean isChildSelectable(int arg0, int arg1) {
return true;
}
public void updateData(ArrayList<String> groups,
ArrayList<ArrayList<HashMap<String, String>>> children) {
this.groups = groups;
this.children = children;
}
}
在我的活动我这样做:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.stop_list);
mExpandableList = (ExpandableListView)findViewById(R.id.expandable_list);
model = new MyModel(this);
}
@Override
protected void onResume() {
super.onResume();
ListEntries entries = model.getEntries();
if(adapter == null){
// Sets the adapter that provides data to the list.
adapter = new StopsInnerExpandableListAdapter(this, entries.getDates(), entries.getChilds());
mExpandableList.setAdapter(adapter);
}
else{
adapter.updateData(entries.getDates(), entries.getChilds());
adapter.notifyDataSetChanged();
}
}
你能发表一些代码吗? – GrIsHu 2013-02-25 10:38:57
我添加了一些代码的帖子:) – 2013-02-25 10:52:01
你有没有找到解决方案? – 2014-02-06 07:31:07