A Common RecyclerView.Adapter implementation which supports all kind of items and has useful data operating APIs such as remove,add,etc.

 protected CommonRecyclerAdapter adapter;
 ...
 recyclerView.setAdapter(adapter);

public class BookTitleBean extends BaseDataBean<Book, BookTitleViewHolder> {

    public BookTitleBean(Book data) {
        super(data);
    }

    @Override
    public BookTitleViewHolder createHolder(ViewGroup parent) {
	    //create an instance of Your ViewHolder
        return new BookTitleViewHolder(getView(parent, BookTitleViewHolder.LAYOUT_ID));
    }
}

public class BookTitleViewHolder extends BaseRecyclerViewHolder<Book> {
	//declare LAYOUT_ID
    public static final int LAYOUT_ID = R.layout.item_book_title;

    public BookTitleViewHolder(View itemView) {
        super(itemView);
    }

    @Override
    public void setData(Book data) {
        if (data == null)
            return;
        setText(R.id.name, data.getName());
        setText(R.id.price, String.valueOf(data.getPrice()));
    }
}

/**
     * Convert normal DataSet to DisplayBeans
     * If the data set which  returned by the server in the same order as in the list on ui,
     * this process will be easy
     */
    protected void initData() {
        //fake data
        Map<ICategory, List<Book>> sourceData = fetchSourceData();
        //display beans
        List<DisplayBean> displayBeans = new ArrayList<>(20);

        //Add a ProgressBar DisplayBean to show a ProgressBar in the top of the list
        CommonDisplayBean progressBean = new CommonDisplayBean(R.layout.item_progress);
        displayBeans.add(progressBean);

        //add categories and books to the list
        for (Iterator<Map.Entry<ICategory, List<Book>>> iterator = sourceData.entrySet().iterator(); iterator.hasNext(); ) {
            Map.Entry<ICategory, List<Book>> entry = iterator.next();
            ICategory category = entry.getKey();
            //add category to the list
            displayBeans.add(new CategoryBean(category));
            List<Book> books = entry.getValue();
            //add books to the category
            if (category != null && books != null) {
                for (Book book : books) {
                    BookTitleBean bookTitleBean = new BookTitleBean(book);
                    displayBeans.add(bookTitleBean);
                }
            }
        }
        //load data and show data in the list
        adapter.loadData(displayBeans);
    }

/**
* An interface represents an abstract category
*/
public interface ICategory {

   String getName();
   long getId();
}

public class CategoryBean extends BaseDataBean<ICategory, CategoryViewHolder> {

   public CategoryBean(ICategory data) {
       super(data);
   }

   @Override
   public CategoryViewHolder createHolder(ViewGroup parent) {
       return new CategoryViewHolder(getView(parent, CategoryViewHolder.LAYOUT_ID));
   }
}

public class CategoryViewHolder extends BaseRecyclerViewHolder<ICategory> {
    public static final int LAYOUT_ID = R.layout.item_book_catagory;
    public CategoryViewHolder(View itemView) {
        super(itemView);
    }
    @Override
    public void setData(ICategory category) {
        if (category == null)
            return;
        setText(R.id.book_category,category.getName());
    }

}

//use DataBean annotation to annotate your ViewHolder
@DataBean(beanName = "BookTitleBean", data = Book.class)
public class BookTitleViewHolder extends BaseRecyclerViewHolder<Book> {

    public static final int LAYOUT_ID = R.layout.item_book_title;

    public BookTitleViewHolder(View itemView) {
        super(itemView);
    }

    @Override
    public void setData(Book data) {
        if (data == null)
            return;
        setText(R.id.name, data.getName());
        setText(R.id.price, String.valueOf(data.getPrice()));
    }
}

package com.steve.creact.powerfuladapter.presentation.viewholder.databean;

import android.view.ViewGroup;

import com.steve.creact.library.display.BaseDataBean;
import com.steve.creact.powerfuladapter.data.Book;
import com.steve.creact.powerfuladapter.presentation.viewholder.BookTitleViewHolder;

/**
 * Generated DataBean for BookTitleViewHolder
 * Powered by Holder-Compiler
 */

public class BookTitleBean extends BaseDataBean<Book, BookTitleViewHolder> {

    public BookTitleBean(Book data) {

        super(data);
    }

    @Override
    public BookTitleViewHolder createHolder(ViewGroup parent) {
        return new BookTitleViewHolder(getView(parent, BookTitleViewHolder.LAYOUT_ID));//that's why need LAYOUT_ID field in ViewHolder
    }
}

#if (${PACKAGE_NAME} && ${PACKAGE_NAME} != "")package ${PACKAGE_NAME};#end
#parse("File Header.java")
@DataBean( beanName = "${DATA}DataBean",data = ${DATA}.class)
public class ${DATA}ViewHolder extends BaseRecyclerViewHolder<${DATA}> {

  public static final int LAYOUT_ID = R.layout.your_layout_id;

  public ${DATA}ViewHolder( View itemView ) {
    super( itemView );
  }

  @Override
  public void setData( ${DATA} data ) {
    if ( data == null ) return;
  }
}