public abstract class BaseAdapter extends Object implements ListAdapter, SpinnerAdapter
Adapter
that can be
used in both ListView
(by implementing the specialized
ListAdapter
interface} and Spinner
(by implementing the
specialized SpinnerAdapter
interface.IGNORE_ITEM_VIEW_TYPE, NO_SELECTION
Constructor and Description |
---|
BaseAdapter() |
Modifier and Type | Method and Description |
---|---|
boolean |
areAllItemsEnabled()
Indicates whether all the items in this adapter are enabled.
|
View |
getDropDownView(int position,
View convertView,
ViewGroup parent)
Get a
View that displays in the drop down popup
the data at the specified position in the data set. |
int |
getItemViewType(int position)
Get the type of View that will be created by
Adapter.getView(int, android.view.View, android.view.ViewGroup) for the specified item. |
int |
getViewTypeCount()
Returns the number of types of Views that will be created by
Adapter.getView(int, android.view.View, android.view.ViewGroup) . |
boolean |
hasStableIds()
Indicates whether the item ids are stable across changes to the
underlying data.
|
boolean |
isEmpty() |
boolean |
isEnabled(int position)
Returns true if the item at the specified position is not a separator.
|
void |
notifyDataSetChanged()
Notifies the attached observers that the underlying data has been changed
and any View reflecting the data set should refresh itself.
|
void |
notifyDataSetInvalidated()
Notifies the attached observers that the underlying data is no longer valid
or available.
|
void |
registerDataSetObserver(DataSetObserver observer)
Register an observer that is called when changes happen to the data used by this adapter.
|
void |
unregisterDataSetObserver(DataSetObserver observer)
Unregister an observer that has previously been registered with this
adapter via
Adapter.registerDataSetObserver(android.database.DataSetObserver) . |
public boolean hasStableIds()
Adapter
hasStableIds
in interface Adapter
public void registerDataSetObserver(DataSetObserver observer)
Adapter
registerDataSetObserver
in interface Adapter
observer
- the object that gets notified when the data set changes.public void unregisterDataSetObserver(DataSetObserver observer)
Adapter
Adapter.registerDataSetObserver(android.database.DataSetObserver)
.unregisterDataSetObserver
in interface Adapter
observer
- the object to unregister.public void notifyDataSetChanged()
public void notifyDataSetInvalidated()
public boolean areAllItemsEnabled()
ListAdapter
areAllItemsEnabled
in interface ListAdapter
ListAdapter.isEnabled(int)
public boolean isEnabled(int position)
ListAdapter
ArrayIndexOutOfBoundsException
should be thrown in that case for fast failure.isEnabled
in interface ListAdapter
position
- Index of the itemListAdapter.areAllItemsEnabled()
public View getDropDownView(int position, View convertView, ViewGroup parent)
SpinnerAdapter
Get a View
that displays in the drop down popup
the data at the specified position in the data set.
getDropDownView
in interface SpinnerAdapter
position
- index of the item whose view we want.convertView
- the old view to reuse, if possible. Note: You should
check that this view is non-null and of an appropriate type before
using. If it is not possible to convert this view to display the
correct data, this method can create a new view.parent
- the parent that this view will eventually be attached toView
corresponding to the data at the
specified position.public int getItemViewType(int position)
Adapter
Adapter.getView(int, android.view.View, android.view.ViewGroup)
for the specified item.getItemViewType
in interface Adapter
position
- The position of the item within the adapter's data set whose view type we
want.Adapter.getView(int, android.view.View, android.view.ViewGroup)
. Note: Integers must be in the
range 0 to Adapter.getViewTypeCount()
- 1. Adapter.IGNORE_ITEM_VIEW_TYPE
can
also be returned.Adapter.IGNORE_ITEM_VIEW_TYPE
public int getViewTypeCount()
Adapter
Returns the number of types of Views that will be created by
Adapter.getView(int, android.view.View, android.view.ViewGroup)
. Each type represents a set of views that can be
converted in Adapter.getView(int, android.view.View, android.view.ViewGroup)
. If the adapter always returns the same
type of View for all items, this method should return 1.
This method will only be called when when the adapter is set on the
the AdapterView
.
getViewTypeCount
in interface Adapter
public boolean isEmpty()
isEmpty
in interface Adapter