You can use this class to realize a simple sectioned grid `RecyclerView.Adapter` without changing your code.

![Screen](http://3.bp.blogspot.com/-8cl5IxT3X7c/VLhOC8EWUiI/AAAAAAAAkMs/2V9K-EoPThc/s400/sectionedGridRecycler.png)  

The `RecyclerView` has to use a `GridLayoutManager`.

This is a porting of the class `SimpleSectionedListAdapter` provided by [Google](https://github.com/google/iosched/blob/master/android/src/main/java/com/google/samples/apps/iosched/ui/SimpleSectionedListAdapter.java)

If you are looking for a sectioned list `RecyclerView.Adapter` you can take a look [here](https://gist.github.com/gabrielemariotti/4c189fb1124df4556058)


Example:
```java
         //Your RecyclerView
        mRecyclerView = (RecyclerView) getActivity().findViewById(R.id.list);
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(new GridLayoutManager(getActivity(),4));

        //Your RecyclerView.Adapter
        mAdapter = new SimpleAdapter(getActivity());

        //This is the code to provide a sectioned grid
        List<SectionedGridRecyclerViewAdapter.Section> sections =
                new ArrayList<SectionedGridRecyclerViewAdapter.Section>();

        //Sections
        sections.add(new SectionedGridRecyclerViewAdapter.Section(0,"Section 1"));
        sections.add(new SectionedGridRecyclerViewAdapter.Section(5,"Section 2"));
        sections.add(new SectionedGridRecyclerViewAdapter.Section(12,"Section 3"));
        sections.add(new SectionedGridRecyclerViewAdapter.Section(14,"Section 4"));
        sections.add(new SectionedGridRecyclerViewAdapter.Section(20,"Section 5"));

        //Add your adapter to the sectionAdapter
        SectionedGridRecyclerViewAdapter.Section[] dummy = new SectionedGridRecyclerViewAdapter.Section[sections.size()];
        SectionedGridRecyclerViewAdapter mSectionedAdapter = new
                SectionedGridRecyclerViewAdapter(getActivity(),R.layout.section,R.id.section_text,mRecyclerView,mAdapter);
        mSectionedAdapter.setSections(sections.toArray(dummy));

        //Apply this adapter to the RecyclerView
        mRecyclerView.setAdapter(mSectionedAdapter);
```

You can customize the section layout, changing the layout `section.xml` and changing the code in the `SectionedGridRecyclerViewAdapter.SectionViewHolder` class and `SectionedGridRecyclerViewAdapter#onBindViewHolder` method.