试试这个适配器：
public class ExpandableListAdapter extends baseExpandableListAdapter {class ViewHolder { TextView childText; TextView counterText; Button addItemButton; Button deleteItemButton;}class ChildItem{ String name; int quantity; ChildItem(String name, int quantity){ this.name = name; this.quantity = quantity; }}class Pos{ int group; int child; Pos(int group, int child){ this.group = group; this.child = child; }}private Context context;private List<String> listDataHeader;//private HashMap<String, List<String>> listHashMap;private HashMap<String, List<ChildItem>> listChildMap;public ExpandableListAdapter(Context context, List<String> listDataHeader, HashMap<String, List<String>> listHashMap) { this.context = context; this.listDataHeader = listDataHeader; listChildMap = new HashMap<>(); for(int i=0; i<getGroupCount(); i++){ List<ChildItem> listTemp = new ArrayList<>(); for(int j=0; j<listHashMap.get(listDataHeader.get(i)).size(); j++){ listTemp.add(new ChildItem(listHashMap.get(listDataHeader.get(i)).get(j), 0)); } listChildMap.put(listDataHeader.get(i), listTemp); }}@Overridepublic int getGroupCount() { return listDataHeader.size();}@Overridepublic int getChildrenCount(int groupPosition) { return listChildMap.get(listDataHeader.get(groupPosition)).size();}@Overridepublic String getGroup(int groupPosition) { return listDataHeader.get(groupPosition);}@Overridepublic ChildItem getChild(int groupPosition, int childPosition) { return listChildMap.get(listDataHeader.get(groupPosition)).get(childPosition);}@Overridepublic long getGroupId(int groupPosition) { return groupPosition;}@Overridepublic long getChildId(int groupPosition, int childPosition) { return childPosition;}@Overridepublic boolean hasStableIds() { return false;}@Overridepublic View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { String headerTitle = getGroup(groupPosition); if(convertView == null) { LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = inflater.inflate(R.layout.list_group, null); } TextView listHeader = (TextView) convertView.findViewById(R.id.list_header); listHeader.setTypeface(null, Typeface.BOLD); listHeader.setText(headerTitle); return convertView;}@Overridepublic View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { ViewHolder viewHolder; if(convertView == null) { LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = inflater.inflate(R.layout.list_item, null); TextView textListChild = (TextView) convertView.findViewById(R.id.list_item_header); TextView itemsCounter = (TextView) convertView.findViewById(R.id.items_counter); Button addItemButton = (Button) convertView.findViewById(R.id.plus_btn); viewHolder = new ViewHolder(); viewHolder.childText = textListChild; viewHolder.counterText = itemsCounter; viewHolder.addItemButton = addItemButton; } else { viewHolder = (ViewHolder) convertView.getTag(); } ChildItem child = getChild(groupPosition, childPosition); viewHolder.childText.setText(child.name); viewHolder.counterText.setText("" + child.quantity); viewHolder.addItemButton.setonClickListener(new View.onClickListener(){ @Override public void onClick(View v) { Pos pos = (Pos)v.getTag(); ChildItem selectedItem = getChild(pos.group, pos.child); selectedItem.quantity = selectedItem.quantity + 1; notifyDataSetChanged(); PutOrderDrinks.addOrder(selectedItem.name); } }); viewHolder.addItemButton.setTag(new Pos(groupPosition, childPosition)); convertView.setTag(viewHolder); return convertView;}@Overridepublic boolean isChildSelectable(int groupPosition, int childPosition) { return true;}}
