public abstract class

BaseAdapter

extends Object
implements ListAdapter SpinnerAdapter
java.lang.Object
   ↳ android.widget.BaseAdapter
Known Direct Subclasses
Known Indirect Subclasses

Class Overview

Common base class of common implementation for an Adapter that can be used in both ListView (by implementing the specialized ListAdapter interface} and Spinner (by implementing the specialized SpinnerAdapter interface.

Summary

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Inherited Constants
From interface android.widget.Adapter
Public Constructors
BaseAdapter()
Public Methods
boolean areAllItemsEnabled()
Are all items in this ListAdapter enabled? If yes it means all items are selectable and clickable.
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 getView(int, View, ViewGroup) for the specified item.
int getViewTypeCount()

Returns the number of types of Views that will be created by getView(int, View, ViewGroup).

boolean hasStableIds()
Indicated 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 View that the underlying data has been changed and it should refresh itself.
void notifyDataSetInvalidated()
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 registerDataSetObserver(DataSetObserver).
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Inherited Methods
From class java.lang.Object
From interface android.widget.Adapter
From interface android.widget.ListAdapter
From interface android.widget.SpinnerAdapter

Public Constructors

public BaseAdapter ()

Public Methods

public boolean areAllItemsEnabled ()

Are all items in this ListAdapter enabled? If yes it means all items are selectable and clickable.

Returns
  • True if all items are enabled

public 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.

Parameters
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 to
Returns
  • a View corresponding to the data at the specified position.

public int getItemViewType (int position)

Get the type of View that will be created by getView(int, View, ViewGroup) for the specified item.

Parameters
position The position of the item within the adapter's data set whose view type we want.
Returns

public int getViewTypeCount ()

Returns the number of types of Views that will be created by getView(int, View, ViewGroup). Each type represents a set of views that can be converted in getView(int, 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.

Returns
  • The number of types of Views that will be created by this adapter

public boolean hasStableIds ()

Indicated whether the item ids are stable across changes to the underlying data.

Returns
  • True if the same id always refers to the same object.

public boolean isEmpty ()

public boolean isEnabled (int position)

Returns true if the item at the specified position is not a separator. (A separator is a non-selectable, non-clickable item).

Parameters
position Index of the item
Returns
  • True if the item is not a separator

public void notifyDataSetChanged ()

Notifies the attached View that the underlying data has been changed and it should refresh itself.

public void notifyDataSetInvalidated ()

public void registerDataSetObserver (DataSetObserver observer)

Register an observer that is called when changes happen to the data used by this adapter.

Parameters
observer the object that gets notified when the data set changes.

public void unregisterDataSetObserver (DataSetObserver observer)

Unregister an observer that has previously been registered with this adapter via registerDataSetObserver(DataSetObserver).

Parameters
observer the object to unregister.