StickyHeaderExpandbleRecyclerView

Maven:

compile 'com.drake.ui:stickyheaderexpandablerecyclerview:1.0.1'

This library is based on CommonRecyclerView.

Init StickyHeaderExpandbleRecyclerView

StickyHeaderExpandableRecyclerView<MyChildItem, MyGroupItem> recyclerView = findViewById(R.id.id_stick_header_expandable_recyclerView);

recyclerView.setCallback(new StickyHeaderExpandableRecyclerView.Callback<MyGroupItem>() {

    @Override
    public RecyclerView.ViewHolder getHolder(Context context, ViewGroup parent, int viewType) {
        // TODO Add your ViewHolder like this:
        return ListFactory.getHolder(context, parent, viewType);
    }

    @Override
    public void buildList(List<MyGroupItem> list) {
        // TODO Add your Item like this:
        for (int i = 0; i < 5; i++) {
            MyGroupItem groupItem = new MyGroupItem();
            groupItem.title = "Group" + i;
            groupItem.mList = new ArrayList<>();
            for (int j = 0; j < 10; j++) {
                MyChildItem childItem = new MyChildItem();
                childItem.title = "Child-->" + j;
                groupItem.mList.add(childItem);
            }
            list.add(groupItem);
        }
    }

});

// Load Async
recyclerView.reloadData();

ListFactory

public class ListFactory {

    public static final int VIEW_TYPE_GROUP = 1;

    public static final int VIEW_TYPE_CHILD = 2;

    public static View getView(Context context, ViewGroup parent, int viewType) {
        switch (viewType) {
            case VIEW_TYPE_GROUP:
                return LayoutInflater.from(context).inflate(R.layout.layout_list_group, parent, false);
            case VIEW_TYPE_CHILD:
                return LayoutInflater.from(context).inflate(R.layout.layout_list_child, parent, false);
        }
        return null;
    }

    public static RecyclerView.ViewHolder getHolder(Context context, ViewGroup parent, int viewType) {
        View view = getView(context, parent, viewType);
        switch (viewType) {
            case VIEW_TYPE_GROUP:
                return new MyGroupHolder(context, view);
            case VIEW_TYPE_CHILD:
                return new MyChildHolder(context, view);

        }
        return null;
    }
}

MyGroupHolder

public class MyGroupHolder extends BaseGroupViewHolder<MyGroupItem> {

    private TextView mTitle;

    private MyGroupItem mItem;

    public MyGroupHolder(Context context, View itemView) {
        super(context, itemView);
        mTitle = itemView.findViewById(R.id.id_list_item_group_tv);
    }

    @Override
    public void build(MyGroupItem groupItem, int groupPosition) {
        mItem = groupItem;

        if (mItem == null)
            return;

        if (mTitle != null) {
            mTitle.setText(mItem.title);
        }
    }

}

MyChildHolder

public class MyChildHolder extends BaseChildViewHolder<MyChildItem, MyGroupItem> {

    private TextView mTitle;

    private MyChildItem mItem;

    public MyChildHolder(Context context, View itemView) {
        super(context, itemView);
        mTitle = itemView.findViewById(R.id.id_list_item_child_tv);
    }

    @Override
    public void build(MyGroupItem groupItem, MyChildItem childItem, int groupPosition, int childPosition) {
        mItem = childItem;

        if (mItem == null)
            return;

        if (mTitle != null) {
            mTitle.setText(mItem.title);
        }
    }

}

MyGroupItem

public class MyGroupItem extends BaseGroupItem<MyChildItem> {

    public String title;
    public List<MyChildItem> mList;

    @Override
    public List<MyChildItem> getChildrenList() {
        return mList;
    }

    @Override
    public int getType() {
        return ListFactory.VIEW_TYPE_GROUP;
    }
}

MyChildItem

public class MyChildItem extends BaseChildItem {

    public String title;

    @Override
    public int getType() {
        return ListFactory.VIEW_TYPE_CHILD;
    }
}

Load Data

// Load Async
recyclerView.reloadData();

Refresh List Async

recyclerView.updateListAsync();

Refresh List Sync (Same to notifyDataSetChange)

recyclerView.updateList();

Set your Item list

recyclerView.setItemList(mList);
// refresh
recyclerView.updateList();

Get CommonRecyclerView

CommonRecyclerView getRecyclerView();