Android Section Adapter allows you to easily create a RecyclerView.Adapter which will automatically sort your data into sections and add a header above each section.

You can use it with the provided header view:

Or you can use it with a custom header view that you specify:

Add the dependency to your build.gradle file.

compile 'com.cardinalsolutions:android-sectioned-adapter:1.0.0'

Your data object needs to implement Categorizable.getCategory() to return the name of its category. For each category name that appears in the data, SectionedAdapter will automatically create and insert a header view for that category and place all the item views beneath it. For example, the Dog class will be sectioned according to the breed of the dog.

class Dog implements Categorizable
{
    String name;
    String breed;

    public String getCategory()
    {
        return breed;
    }
}

The Person example is sectioned according to the first letter of his/her last name.

class Person implements Categorizable
{
    String firstName;
    String lastName;

    public String getCategory()
    {
        return lastName.substring(0, 1);
    }
}

Sectioned Adapter takes care of generating and inserting the header views, so all your subclass needs to do is implement onCreateItemViewHolder() to create a ViewHolder for your items and onBindItemViewHolder() to bind the data, exactly like you would do when creating a normal RecyclerView.Adapter. SectionedAdapter takes type parameter, the type of your model object you want to adapt. Finally, you must call setListItems() with your list of Categorizable data in order to generate the headers and show your data.

Sectioned Adapter will automatically generate a header view for your data using a built-in layout as seen in the Yankees example above. You can also specify an XML layout that you want to inflate for each header. The view must contain a Text View with the ID @android:id/title.