RecyclerView.ViewCacheExtension

abstract class RecyclerView.ViewCacheExtension

ViewCacheExtension is a helper class to provide an additional layer of view caching that can be controlled by the developer.

When getViewForPosition is called, Recycler checks attached scrap and first level cache to find a matching View. If it cannot find a suitable View, Recycler will call the getViewForPositionAndType before checking RecycledViewPool.

Note that, Recycler never sends Views to this method to be cached. It is developers responsibility to decide whether they want to keep their Views in this custom cache or let the default recycling policy handle it.

Summary

Public constructors

Public functions
abstract View?
getViewForPositionAndType(
    recycler: RecyclerView.Recycler,
    position: Int,
    type: Int
)

Returns a View that can be binded to the given Adapter position.

Public constructors

ViewCacheExtension

Added in 1.0.0
ViewCacheExtension()

Public functions

getViewForPositionAndType

Added in 1.0.0
abstract fun getViewForPositionAndType(
    recycler: RecyclerView.Recycler,
    position: Int,
    type: Int
): View?

Returns a View that can be binded to the given Adapter position.

This method should not create a new View. Instead, it is expected to return an already created View that can be re-used for the given type and position. If the View is marked as ignored, it should first call stopIgnoringView before returning the View.

RecyclerView will re-bind the returned View to the position if necessary.

Parameters
recycler: RecyclerView.Recycler

The Recycler that can be used to bind the View
position: Int

The adapter position
type: Int

The type of the View, defined by adapter
Returns
View?

A View that is bound to the given position or NULL if there is no View to re-use
See also
ignoreView