public
static
abstract
class
RecyclerView.ViewCacheExtension
extends Object
| java.lang.Object | |
| ↳ | android.support.v7.widget.RecyclerView.ViewCacheExtension |
ViewCacheExtension is a helper class to provide an additional layer of view caching that can ben controlled by the developer.
When getViewForPosition(int) 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(Recycler, int, int) before checking
RecyclerView.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.
Public constructors | |
|---|---|
RecyclerView.ViewCacheExtension()
|
|
Public methods | |
|---|---|
abstract
View
|
getViewForPositionAndType(RecyclerView.Recycler recycler, int position, int type)
Returns a View that can be binded to the given Adapter position. |
Inherited methods | |
|---|---|
 From
class
java.lang.Object
| |
RecyclerView.ViewCacheExtension ()
View getViewForPositionAndType (RecyclerView.Recycler recycler, int position, int type)
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(View) 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:
Developers