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Summary: Inherited Constants | Ctors | Methods | Inherited Methods | [Expand All]

Added in API level 1

public abstract class

BaseAdapter

extends Object
implements ListAdapter SpinnerAdapter

java.lang.Object
↳	android.widget.BaseAdapter

Known Direct Subclasses

ArrayAdapter<T>, CursorAdapter, SimpleAdapter

Known Indirect Subclasses

ResourceCursorAdapter, SimpleCursorAdapter

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() 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 `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() 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void	notifyDataSetInvalidated() Notifies the attached observers that the underlying data is no longer valid or available.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 `registerDataSetObserver(DataSetObserver)`.

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Inherited Methods

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

From interface android.widget.Adapter

abstract int	getCount() How many items are in the data set represented by this Adapter.
abstract Object	getItem(int position) Get the data item associated with the specified position in the data set.
abstract long	getItemId(int position) Get the row id associated with the specified position in the list.
abstract int	getItemViewType(int position) Get the type of View that will be created by `getView(int, View, ViewGroup)` for the specified item.
abstract View	getView(int position, View convertView, ViewGroup parent) Get a View that displays the data at the specified position in the data set.
abstract int	getViewTypeCount() Returns the number of types of Views that will be created by `getView(int, View, ViewGroup)`.
abstract boolean	hasStableIds() Indicates whether the item ids are stable across changes to the underlying data.
abstract boolean	isEmpty()
abstract void	registerDataSetObserver(DataSetObserver observer) Register an observer that is called when changes happen to the data used by this adapter.
abstract void	unregisterDataSetObserver(DataSetObserver observer) Unregister an observer that has previously been registered with this adapter via `registerDataSetObserver(DataSetObserver)`.

From interface android.widget.ListAdapter

From interface android.widget.SpinnerAdapter

Public Constructors

public BaseAdapter ()

Added in API level 1

Public Methods

public boolean areAllItemsEnabled ()

Added in API level 1

Indicates whether all the items in this adapter are enabled. If the value returned by this method changes over time, there is no guarantee it will take effect. If true, it means all items are selectable and clickable (there is no separator.)

Returns

True if all items are enabled, false otherwise.

public View getDropDownView (int position, View convertView, ViewGroup parent)

Added in API level 1

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)

Added in API level 1

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

An integer representing the type of View. Two views should share the same type if one can be converted to the other in getView(int, View, ViewGroup). Note: Integers must be in the range 0 to getViewTypeCount() - 1. IGNORE_ITEM_VIEW_TYPE can also be returned.

public int getViewTypeCount ()

Added in API level 1

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 ()

Added in API level 1

Indicates 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 ()

Added in API level 1

public boolean isEnabled (int position)

Added in API level 1

Returns true if the item at the specified position is not a separator. (A separator is a non-selectable, non-clickable item). The result is unspecified if position is invalid. An ArrayIndexOutOfBoundsException should be thrown in that case for fast failure.

Parameters

position	Index of the item

Returns

True if the item is not a separator

public void notifyDataSetChanged ()

Added in API level 1

Notifies the attached observers that the underlying data has been changed and any View reflecting the data set should refresh itself.

public void notifyDataSetInvalidated ()

Added in API level 1

Notifies the attached observers that the underlying data is no longer valid or available. Once invoked this adapter is no longer valid and should not report further data set changes.

public void registerDataSetObserver (DataSetObserver observer)

Added in API level 1

Parameters

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

public void unregisterDataSetObserver (DataSetObserver observer)

Added in API level 1

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

Parameters

observer	the object to unregister.

Results

Interfaces

Classes

Enums

Exceptions

BaseAdapter

Class Overview

Summary

Public Constructors

public BaseAdapter ()

Public Methods

public boolean areAllItemsEnabled ()

Returns

public View getDropDownView (int position, View convertView, ViewGroup parent)

Parameters

Returns

public int getItemViewType (int position)

Parameters

Returns

public int getViewTypeCount ()

Returns

public boolean hasStableIds ()

Returns

public boolean isEmpty ()

public boolean isEnabled (int position)

Parameters

Returns

public void notifyDataSetChanged ()

public void notifyDataSetInvalidated ()

public void registerDataSetObserver (DataSetObserver observer)

Parameters

public void unregisterDataSetObserver (DataSetObserver observer)

Parameters