How to write custom ExpandableListAdapter

Question

I\'m looking to write my own ExpandableListAdapter which operates similarly to ArrayAdapter. My data model is this:

public class Gr         


        

Answer 1

   public class CustomExpandableAdapter extends BaseExpandableListAdapter {
        private Context mContext;
        private List mData;
        private int mSelectedPosition = -1;

        public CustomExpandableAdapter(Context context, List data ) {
            mData = data;
            mContext = context;

        }

        @Override
        public int getGroupCount() {
            return mData.size();
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return mData.get(groupPosition).children.size();
        }

        @Override
        public Object getGroup(int groupPosition) {
            return mData.get(groupPosition);
        }

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return mData.get(groupPosition).children.get(childPosition);
        }

        @Override
        public long getGroupId(int groupPosition) {
            return groupPosition;
        }

        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return childPosition;
        }

        @Override
        public boolean hasStableIds() {
            return false;
        }

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
            HeaderViewHolder headerViewHolder = null;
            if (convertView == null) {
                convertView = LayoutInflater.from(mContext).inflate(R.layout.faq_header_text_layout, null);
                headerViewHolder = new HeaderViewHolder(convertView);
                convertView.setTag(headerViewHolder);
            }
            headerViewHolder = (HeaderViewHolder) convertView.getTag();

            headerViewHolder.mGroupHeader.setText(mData.get(groupPosition).name);
            return convertView;
        }

        @Override
        public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
            ChildViewHolder childViewHolder = null;
            if (convertView == null) {
                convertView = LayoutInflater.from(mContext).inflate(R.layout.faq_textview_layout, null);
                childViewHolder = new ChildViewHolder(convertView);
                convertView.setTag(childViewHolder);
            }
            childViewHolder = (ChildViewHolder) convertView.getTag();

                        childViewHolder.mChildTitle.setText(mData.get(groupPosition).children.get(childPosition));
            return convertView;
        }

        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return false;
        }

        private static class HeaderViewHolder {
            final TextView mGroupHeader;

            private HeaderViewHolder(View group) {
                mGroupHeader = (TextView) group.findViewById(R.id.txv_faq_header_text_layout);
            }
        }

        private static class ChildViewHolder {
            final TextView mChildTitle;

            private ChildViewHolder(View group) {
                mChildTitle = (TextView) group.findViewById(R.id.txv_faq_textview_layout);
            }
        }

        @Override
        public void unregisterDataSetObserver(DataSetObserver observer) {
            if (observer != null) {
                super.unregisterDataSetObserver(observer);
            }
        }

        public void setSelectedPosition(int selectedPosition) {
            mSelectedPosition = selectedPosition;
        }
    }