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ConcatAdapter

class ConcatAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder!>
kotlin.Any
   ↳ androidx.recyclerview.widget.RecyclerView.Adapter<androidx.recyclerview.widget.RecyclerView.ViewHolder>
   ↳ androidx.recyclerview.widget.ConcatAdapter

An Adapter implementation that presents the contents of multiple adapters in sequence. 

MyAdapter adapter1 = ...;
  AnotherAdapter adapter2 = ...;
  ConcatAdapter concatenated = new ConcatAdapter(adapter1, adapter2);
  recyclerView.setAdapter(concatenated);

By default, ConcatAdapter isolates view types of nested adapters from each other such that it will change the view type before reporting it back to the RecyclerView to avoid any conflicts between the view types of added adapters. This also means each added adapter will have its own isolated pool of ViewHolders, with no re-use in between added adapters.

If your Adapters share the same view types, and can support sharing ViewHolder s between added adapters, provide an instance of Config where you set Config#isolateViewTypes to false. A common usage pattern for this is to return the R.layout.<layout_name> from the Adapter#getItemViewType(int) method.

When an added adapter calls one of the notify methods, ConcatAdapter properly offsets values before reporting it back to the RecyclerView. If an adapter calls Adapter#notifyDataSetChanged(), ConcatAdapter also calls Adapter#notifyDataSetChanged() as calling Adapter#notifyItemRangeChanged(int, int) will confuse the RecyclerView. You are highly encouraged to to use SortedList or ListAdapter to avoid calling Adapter#notifyDataSetChanged().

Whether ConcatAdapter should support stable ids is defined in the Config object. Calling Adapter#setHasStableIds(boolean) has no effect. See documentation for Config.StableIdMode for details on how to configure ConcatAdapter to use stable ids. By default, it will not use stable ids and sub adapter stable ids will be ignored. Similar to the case above, you are highly encouraged to use ListAdapter, which will automatically calculate the changes in the data set for you so you won't need stable ids.

It is common to find the adapter position of a ViewHolder to handle user action on the ViewHolder. For those cases, instead of calling ViewHolder#getAdapterPosition(), use ViewHolder#getBindingAdapterPosition(). If your adapters share ViewHolders, you can use the ViewHolder#getBindingAdapter() method to find the adapter which last bound that ViewHolder.

Summary

Nested classes

The configuration object for a ConcatAdapter.
Public constructors
<init>(@NonNull vararg adapters: RecyclerView.Adapter<out RecyclerView.ViewHolder!>!)

Creates a ConcatAdapter with Config#DEFAULT and the given adapters in the given order.
<init>(@NonNull config: ConcatAdapter.Config, @NonNull vararg adapters: RecyclerView.Adapter<out RecyclerView.ViewHolder!>!)

Creates a ConcatAdapter with the given config and the given adapters in the given order.

Creates a ConcatAdapter with Config#DEFAULT and the given adapters in the given order.
<init>(@NonNull config: ConcatAdapter.Config, @NonNull adapters: MutableList<out RecyclerView.Adapter<out RecyclerView.ViewHolder!>!>)

Creates a ConcatAdapter with the given config and the given adapters in the given order.
Public methods
Boolean

Appends the given adapter to the existing list of adapters and notifies the observers of this ConcatAdapter.
Boolean
addAdapter(index: Int, @NonNull adapter: RecyclerView.Adapter<out RecyclerView.ViewHolder!>)

Adds the given adapter to the given index among other adapters that are already added.
Int