IT. Expert System.

All Known Subinterfaces:

ListAdapter, SpinnerAdapter, WrapperListAdapter

All Known Implementing Classes:

ArrayAdapter, BaseAdapter, CursorAdapter, CursorAdapter, HeaderViewListAdapter, ListOfButtons.MyAdapter, ListWithMailMessages.MyAdapter, RemoteViewsAdapter, ResourceCursorAdapter, ResourceCursorAdapter, SimpleAdapter, SimpleCursorAdapter, SimpleCursorAdapter

public interface Adapter

See Also:

ArrayAdapter, CursorAdapter, SimpleCursorAdapter

• Field Summary

  Fields

  Modifier and Type	Field and Description
  static int	IGNORE_ITEM_VIEW_TYPE An item view type that causes the AdapterView to ignore the item view.
  static int	NO_SELECTION

• Method Summary

  Methods

  Modifier and Type	Method and Description
  int	getCount() How many items are in the data set represented by this Adapter.
  Object	getItem(int position) Get the data item associated with the specified position in the data set.
  long	getItemId(int position) Get the row id associated with the specified position in the list.
  int	getItemViewType(int position) Get the type of View that will be created by getView(int, android.view.View, android.view.ViewGroup) for the specified item.
  View	getView(int position, View convertView, ViewGroup parent) Get a View that displays the data at the specified position in the data set.
  int	getViewTypeCount() Returns the number of types of Views that will be created by 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()
  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(android.database.DataSetObserver).

• Field Detail

  • IGNORE_ITEM_VIEW_TYPE

    static final int IGNORE_ITEM_VIEW_TYPE

    An item view type that causes the AdapterView to ignore the item view. For example, this can be used if the client does not want a particular view to be given for conversion in getView(int, View, ViewGroup).

    See Also:

    getItemViewType(int), getViewTypeCount(), Constant Field Values

  • NO_SELECTION

    static final int NO_SELECTION

    See Also:

    Constant Field Values

• Method Detail

  • registerDataSetObserver

    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.

  • unregisterDataSetObserver

    void unregisterDataSetObserver(DataSetObserver observer)

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

    Parameters:

    observer - the object to unregister.

  • getCount

    int getCount()

    How many items are in the data set represented by this Adapter.

    Returns:

    Count of items.

  • getItem

    Object getItem(int position)

    Get the data item associated with the specified position in the data set.

    Parameters:

    position - Position of the item whose data we want within the adapter's data set.

    Returns:

    The data at the specified position.

  • getItemId

    long getItemId(int position)

    Get the row id associated with the specified position in the list.

    Parameters:

    position - The position of the item within the adapter's data set whose row id we want.

    Returns:

    The id of the item at the specified position.

  • hasStableIds

    boolean hasStableIds()

    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.

  • getView

    View getView(int position,
               View convertView,
               ViewGroup parent)

    Get a View that displays the data at the specified position in the data set. You can either create a View manually or inflate it from an XML layout file. When the View is inflated, the parent View (GridView, ListView...) will apply default layout parameters unless you use LayoutInflater.inflate(int, android.view.ViewGroup, boolean) to specify a root view and to prevent attachment to the root.

    Parameters:

    position - The position of the item within the adapter's data set 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. Heterogeneous lists can specify their number of view types, so that this View is always of the right type (see getViewTypeCount() and getItemViewType(int)).

    parent - The parent that this view will eventually be attached to

    Returns:

    A View corresponding to the data at the specified position.

  • getItemViewType

    int getItemViewType(int position)

    Get the type of View that will be created by getView(int, android.view.View, android.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, android.view.View, android.view.ViewGroup). Note: Integers must be in the range 0 to getViewTypeCount() - 1. IGNORE_ITEM_VIEW_TYPE can also be returned.

    See Also:

    IGNORE_ITEM_VIEW_TYPE

  • getViewTypeCount

    int getViewTypeCount()

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

    Returns:

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

  • isEmpty

    boolean isEmpty()

    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.