android getChildView is not being called after notifyDataSetChanged

Question

I have a expandableListView and tried to change its childs like that:

((SubItem) adapter.getChild(i+1, 5)).setCount(unreadBox);
 adapter.notifyDataSetChanged();

Here is my adapter class:

public class DrawerAdapter extends BaseExpandableListAdapter {

private Context context;
private List<Item> items;
private List<List<SubItem>> subItems;

public DrawerAdapter(Context context, List<Item> items, List<List<SubItem>> subItems) {
    this.context = context;
    this.items = items;
    this.subItems = subItems;
}

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

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

@Override
public Object getGroup(int position) {
    return items.get(position);
}

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

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

@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 view, ViewGroup viewGroup) {

    Item item = (Item) getGroup(groupPosition);

    if (view == null) {
        LayoutInflater layoutInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = layoutInflater.inflate(R.layout.list_drawer_group, null);
    }

    ImageView iconView = (ImageView) view.findViewById(R.id.icon_view);
    if (item.iconDrawableId != null) {
        iconView.setImageResource(item.iconDrawableId);
        iconView.setVisibility(View.VISIBLE);
    } else {
        iconView.setVisibility(View.GONE);
    }

    TextView groupHeader = (TextView) view.findViewById(R.id.group_header);
    groupHeader.setText(item.title);
    if (item.iconDrawableId != null) {
        groupHeader.setPadding(
            DimensionHelper.dpToPixels(context, 4.0f), 0,
            DimensionHelper.dpToPixels(context, 16.0f), 0);
    } else {
        groupHeader.setPadding(
            DimensionHelper.dpToPixels(context, 16.0f), 0,
            DimensionHelper.dpToPixels(context, 16.0f), 0);
    }

    ImageView imageView = (ImageView) view.findViewById(R.id.image_view);
    imageView.setImageResource(isExpanded ? R.drawable.ic_navigation_collapse : R.drawable.ic_navigation_expand);
    imageView.setVisibility(getChildrenCount(groupPosition) > 0 ? View.VISIBLE : View.GONE);

    return view;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isExpanded, View view, ViewGroup viewGroup) {

    SubItem subItem = (SubItem) getChild(groupPosition, childPosition);

    if (view == null) {
        LayoutInflater layoutInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = layoutInflater.inflate(R.layout.list_drawer_item, null);
    }

    TextView colorPreView = (TextView) view.findViewById(R.id.colorPreView);
    if (subItem.getColor() != -1) {
        colorPreView.setBackgroundColor(subItem.getColor());
        colorPreView.setVisibility(View.VISIBLE);
    } else {
        colorPreView.setVisibility(View.GONE);
    }

    ImageView iconView = (ImageView) view.findViewById(R.id.icon_view);
    if (subItem.iconDrawableId != null) {
        iconView.setImageResource(subItem.iconDrawableId);
        iconView.setVisibility(View.VISIBLE);
    } else {
        iconView.setVisibility(View.GONE);
    }

    TextView title = (TextView) view.findViewById(R.id.title_text_view);
    title.setText(subItem.title);

    if (subItem.iconDrawableId != null) {
        title.setPadding(
                DimensionHelper.dpToPixels(context, 4.0f), 0,
                DimensionHelper.dpToPixels(context, 16.0f), 0);
    } else {
        title.setPadding(
                DimensionHelper.dpToPixels(context, 40.0f), 0,
                DimensionHelper.dpToPixels(context, 16.0f), 0);
    }

    TextView counter = (TextView) view.findViewById(R.id.counter_text_view);
    counter.setText(String.valueOf(subItem.count));
    counter.setVisibility(subItem.count > 0 ? View.VISIBLE : View.GONE);

    return view;
}

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

public static class Item {

    protected String   title;
    protected Integer  iconDrawableId;
    protected Listener listener;

    public Item(String title, Integer iconDrawableId, Listener listener) {
        this.title = title;
        this.iconDrawableId = iconDrawableId;
        this.listener = listener;
    }

    public Listener getListener() {
        return listener;
    }

    public static interface Listener {
        public void onClick(FragmentManager fragmentManager);
    }
}

public static class SubItem extends Item {

    protected long count;
    protected int color;

    public SubItem(String title, Integer iconDrawableId, long count, int color, Listener listener) {
        super(title, iconDrawableId, listener);
        this.count = count;
        this.color = color;
    }

    public long getCount() {
        return count;
    }

    public void setCount(long count) {
        this.count = count;
    }

    public int getColor() {
        return color;
    }

    public void setColor(int color) {
        this.color = color;
    }
}
}

notifyDataSetChanged() method is not working properly, sometimes getChildView is being called sometimes not,please help in order to fix this issue.

Answer 1

You are changing value to child Item however not setting back inside of Adapter.

SubItem item = ((SubItem) adapter.getChild(i+1, 5)).setCount(unreadBox);
adapter.setChild(i+1,5,item);
adapter.notifyDataSetChanged();

add this in Adapter

@Override
public void setChild(int groupPosition, int childPosition,SubItem item) {
    subItems.get(groupPosition).get(childPosition) = item;
}