IT. Expert System.

All Implemented Interfaces:

Adapter, ListAdapter, SpinnerAdapter

Direct Known Subclasses:

ArrayAdapter, CursorAdapter, CursorAdapter, RemoteViewsAdapter, SimpleAdapter

public abstract class BaseAdapter
extends Object
implements ListAdapter, SpinnerAdapter

• Field Summary

  • Fields inherited from interface android.widget.Adapter

    IGNORE_ITEM_VIEW_TYPE, NO_SELECTION

• Constructor Summary

  Constructors

  Constructor and Description
  BaseAdapter()

• Method Summary

  Methods

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  void	notifyDataSetInvalidated() Notifies the attached observers that the underlying data is no longer valid or available.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

  • Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Methods inherited from interface android.widget.Adapter

    getCount, getItem, getItemId, getView

• Constructor Detail

  • BaseAdapter

    public BaseAdapter()

• Method Detail

  • hasStableIds

    public boolean hasStableIds()

    Description copied from interface: Adapter
    Indicates whether the item ids are stable across changes to the underlying data.

    Specified by:

    hasStableIds in interface Adapter

    Returns:

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

  • registerDataSetObserver

    public void registerDataSetObserver(DataSetObserver observer)

    Description copied from interface: Adapter
    Register an observer that is called when changes happen to the data used by this adapter.

    Specified by:

    registerDataSetObserver in interface Adapter

    Parameters:

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

  • unregisterDataSetObserver

    public void unregisterDataSetObserver(DataSetObserver observer)

    Description copied from interface: Adapter
    Unregister an observer that has previously been registered with this adapter via Adapter.registerDataSetObserver(android.database.DataSetObserver).

    Specified by:

    unregisterDataSetObserver in interface Adapter

    Parameters:

    observer - the object to unregister.

  • notifyDataSetChanged

    public void notifyDataSetChanged()

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

  • notifyDataSetInvalidated

    public void notifyDataSetInvalidated()

    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.

  • areAllItemsEnabled

    public boolean areAllItemsEnabled()

    Description copied from interface: ListAdapter
    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.)

    Specified by:

    areAllItemsEnabled in interface ListAdapter

    Returns:

    True if all items are enabled, false otherwise.

    See Also:

    ListAdapter.isEnabled(int)

  • isEnabled

    public boolean isEnabled(int position)

    Description copied from interface: ListAdapter
    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.

    Specified by:

    isEnabled in interface ListAdapter

    Parameters:

    position - Index of the item

    Returns:

    True if the item is not a separator

    See Also:

    ListAdapter.areAllItemsEnabled()

  • getDropDownView

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

    Description copied from interface: SpinnerAdapter

    Get a View that displays in the drop down popup the data at the specified position in the data set.

    Specified by:

    getDropDownView in interface SpinnerAdapter

    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.

  • getItemViewType

    public int getItemViewType(int position)

    Description copied from interface: Adapter
    Get the type of View that will be created by Adapter.getView(int, android.view.View, android.view.ViewGroup) for the specified item.

    Specified by:

    getItemViewType in interface Adapter

    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 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.

    See Also:

    Adapter.IGNORE_ITEM_VIEW_TYPE

  • getViewTypeCount

    public int getViewTypeCount()

    Description copied from interface: 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.

    Specified by:

    getViewTypeCount in interface Adapter

    Returns:

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

  • isEmpty

    public boolean isEmpty()

    Specified by:

    isEmpty in interface Adapter

    Returns:

    true if this adapter doesn't contain any data. This is used to determine whether the empty view should be displayed. A typical implementation will return getCount() == 0 but since getCount() includes the headers and footers, specialized adapters might want a different behavior.