刷新可扩展列表视图
Refresh Expandable Listview
可扩展列表视图正常,但再次调用时不刷新。旧项目再次出现在可扩展列表视图中。这是我的适配器 class。
我如何刷新 expab=ndable 列表视图中的项目?
MyAdapter.class
public class MyAdapter extends BaseExpandableListAdapter {
private Context _context;
private static List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private static HashMap<String, List<String>> _listDataChild;
public MyAdapter(Context context, List<String> listDataHeader,HashMap<String, List<String>> listChildData) {
this._context = context;
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition)).get(childPosititon);
}
@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) {
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_item, null);
}
TextView txtListChild = (TextView) convertView
.findViewById(R.id.lblListItem);
txtListChild.setText(childText);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}
@Override
public Object getGroup(int groupPosition) {
return this._listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
return this._listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_group, null);
}
TextView lblListHeader = (TextView) convertView.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
将此方法添加到 MyAdapter 并使用它:
public void setNewItems(List<String> listDataHeader,HashMap<String, List<String>> listChildData) {
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
notifyDataSetChanged();
}
listView.invalidateViews()
这里也可以帮忙
您应该在适配器外部调用此函数以满足您的需要。
在主要 class 中,您可以在 onClick
或 onExpand
.
之后调用它
adapter.notifyDataSetChanged();
应该做。
需要在适配器内部完成
假设我们需要在 header 的项目点击后刷新可扩展列表,然后在项目点击侦听器中。
只需使用键从 child 哈希映射中清除项目,
然后从 header 数组列表中清除项目,
然后通知数据集改变了。
childList.remove(parentList.get(groupPosition));
parentList.remove(parentList.get(groupPosition));
notifyDataSetChanged();
可扩展列表视图正常,但再次调用时不刷新。旧项目再次出现在可扩展列表视图中。这是我的适配器 class。 我如何刷新 expab=ndable 列表视图中的项目?
MyAdapter.class
public class MyAdapter extends BaseExpandableListAdapter {
private Context _context;
private static List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private static HashMap<String, List<String>> _listDataChild;
public MyAdapter(Context context, List<String> listDataHeader,HashMap<String, List<String>> listChildData) {
this._context = context;
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition)).get(childPosititon);
}
@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) {
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_item, null);
}
TextView txtListChild = (TextView) convertView
.findViewById(R.id.lblListItem);
txtListChild.setText(childText);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}
@Override
public Object getGroup(int groupPosition) {
return this._listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
return this._listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_group, null);
}
TextView lblListHeader = (TextView) convertView.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
将此方法添加到 MyAdapter 并使用它:
public void setNewItems(List<String> listDataHeader,HashMap<String, List<String>> listChildData) {
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
notifyDataSetChanged();
}
listView.invalidateViews()
这里也可以帮忙
您应该在适配器外部调用此函数以满足您的需要。
在主要 class 中,您可以在 onClick
或 onExpand
.
adapter.notifyDataSetChanged();
应该做。
需要在适配器内部完成
假设我们需要在 header 的项目点击后刷新可扩展列表,然后在项目点击侦听器中。 只需使用键从 child 哈希映射中清除项目, 然后从 header 数组列表中清除项目, 然后通知数据集改变了。
childList.remove(parentList.get(groupPosition));
parentList.remove(parentList.get(groupPosition));
notifyDataSetChanged();