修改
我找到了解决方案,请参阅下文。
ORIGINAL:
我创建了一个ExpandableListView
,它看起来像这样:
每个组视图都有3~5个子视图,我强制扩展所有组视图,
mExpandableListView = (ExpandableListView) mView.findViewById(R.id.expandable_list);
CollectionExpandableListAdapter adapter = new MyExpandableListAdapter(getActivity(), mGroups, mProdChild);
adapter.setInflater(LayoutInflater.from(getActivity().getBaseContext()), getActivity());
mExpandableListView.setAdapter(adapter);
mExpandableListView.setGroupIndicator(null);
for (int i = 0; i < groupList.size() - 1; i++) {
mExpandableListView.expandGroup(i);
}
此外,这是我的适配器代码:
public class MyExpandableListAdapter extends BaseExpandableListAdapter {
private ArrayList<String> mGroupItem;
private ArrayList<ProductListData> mTempChild = new ArrayList<ProductListData>();
private ArrayList<Object> mChildItem = new ArrayList<Object>();
private LayoutInflater mInflater;
private Activity mActivity;
private ImageLoader mImageLoader;
public CollectionExpandableListAdapter(Activity context, ArrayList<String> grList,
ArrayList<Object> childItem) {
mGroupItem = grList;
mChildItem = childItem;
mActivity = context;
mImageLoader = new ImageLoader(mActivity);
}
public void setInflater(LayoutInflater inflater, Activity activity) {
mInflater = inflater;
mActivity = activity;
}
@Override
public ProductListData getChild(int groupPosition, int childPosition) {
return ((ArrayList<ProductListData>) mChildItem.get(groupPosition)).get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, final int childPosition, boolean isLastChild,
View convertView, ViewGroup parent) {
mTempChild = (ArrayList<ProductListData>) mChildItem.get(groupPosition);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.adapter_collection_row_child, null);
}
...
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return ((ArrayList<ProductListData>) mChildItem.get(groupPosition)).size();
}
@Override
public Object getGroup(int groupPosition) {
return mGroupItem.get(groupPosition);
}
@Override
public int getGroupCount() {
return mGroupItem.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup arg3) {
Log.d("LOG", "Group position : " + groupPosition);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.group_row_layout, null);
}
...
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int arg0, int arg1) {
return false;
}
@Override
public void onGroupCollapsed(int groupPosition) {
super.onGroupCollapsed(groupPosition);
}
@Override
public void onGroupExpanded(int groupPosition) {
super.onGroupExpanded(groupPosition);
}
}
创建一个expandableListView工作正常,但是当我滚动列表时,我在getGroupView()
中一直得到0值。在我的logcat中,我希望看到groupPosition
为0, 1, 2, 3, 4..
(当我向下滚动时),但实际上显示0, 0, 0, 1, 0, 2, 0, 3, 0, 4..
在每个0
之前有groupPosition
}。这只发生在第一次滚动时,所以如果我多次向上和向下滚动,它就不会显示额外的0值。
我用Google搜索并花了很多时间来调试它,但我找不到任何解决方案。任何人都可以帮助我吗?
解决方案
我的问题出现在Listview
的布局中。我将layout_height
更改为match_parent
,错误消失了!我找到了解决方案here。
答案 0 :(得分:4)
我有一次类似的问题,得到了错误的观点。 不确定这是否是这种情况,但我做的是评论/删除该行:
if (convertView == null) {
在listadapter中的getGroupView方法和getChildView方法中都。
和ofc相应的结束大括号。
它与listadapter在显示视图时重用视图以使用较少的系统资源有关,但这使得管理imo变得更加困难。