android.widget.Adapter |
Known Indirect Subclasses |
An Adapter object acts as a bridge between an AdapterView
and the
underlying data for that view. The Adapter provides access to the data items.
The Adapter is also responsible for making a View
for
each item in the data set.
Constants | |||||||||||
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int | IGNORE_ITEM_VIEW_TYPE | An item view type that causes the AdapterView to ignore the item
view. |
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int | NO_SELECTION |
Public Methods | |||||||||||
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How many items are in the data set represented by this Adapter.
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Get the data item associated with the specified position in the data set.
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Get the row id associated with the specified position in the list.
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Get the type of View that will be created by
getView(int, View, ViewGroup) for the specified item. | |||||||||||
Get a View that displays the data at the specified position in the data set.
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Returns the number of types of Views that will be created by
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Indicates whether the item ids are stable across changes to the
underlying data.
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Register an observer that is called when changes happen to the data used by this adapter.
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Unregister an observer that has previously been registered with this
adapter via
registerDataSetObserver(DataSetObserver) . |
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)
.
How many items are in the data set represented by this Adapter.
Get the data item associated with the specified position in the data set.
position | Position of the item whose data we want within the adapter's data set. |
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Get the row id associated with the specified position in the list.
position | The position of the item within the adapter's data set whose row id we want. |
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Get the type of View that will be created by getView(int, View, ViewGroup)
for the specified item.
position | The position of the item within the adapter's data set whose view type we want. |
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getView(int, View, ViewGroup)
. Note: Integers must be in the
range 0 to getViewTypeCount()
- 1. IGNORE_ITEM_VIEW_TYPE
can
also be returned.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
inflate(int, android.view.ViewGroup, boolean)
to specify a root view and to prevent attachment to the root.
position | The position of the item within the adapter's data set of the item whose view we want. |
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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 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
.
Indicates whether the item ids are stable across changes to the underlying data.
Register an observer that is called when changes happen to the data used by this adapter.
observer | the object that gets notified when the data set changes. |
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Unregister an observer that has previously been registered with this
adapter via registerDataSetObserver(DataSetObserver)
.
observer | the object to unregister. |
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