Adapter | Android Developers

Adapter

Kotlin
| java

public

interface
Adapter


android.widget.Adapter
Known indirect subclasses

CursorAdapter, HeaderViewListAdapter, ListAdapter, ResourceCursorAdapter, SimpleAdapter, SimpleCursorAdapter, SpinnerAdapter, ThemedSpinnerAdapter, WrapperListAdapter
ArrayAdapter, BaseAdapter

ArrayAdapter You can use this adapter to provide views for an AdapterView,
Returns a view for each object in a collection of data objects you
provide, and can be used with list-based user interface widgets such as
ListView or Spinner

BaseAdapter 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). 

CursorAdapter Adapter that exposes data from a Cursor to a
ListView widget. 

HeaderViewListAdapter ListAdapter used when a ListView has header views. 

ListAdapter Extended Adapter that is the bridge between a ListView
and the data that backs the list. 

ResourceCursorAdapter An easy adapter that creates views defined in an XML file. 

SimpleAdapter An easy adapter to map static data to views defined in an XML file. 

SimpleCursorAdapter An easy adapter to map columns from a cursor to TextViews or ImageViews
defined in an XML file. 

SpinnerAdapter Extended Adapter that is the bridge between a
Spinner and its data. 

ThemedSpinnerAdapter An extension of SpinnerAdapter that is capable of inflating drop-down views
against a different theme than normal views. 

WrapperListAdapter List adapter that wraps another list adapter. 

An Adapter object acts as a bridge between an AdapterView and the underlie data for that watch. The Adapter provides access to the data items. The Adapter is besides creditworthy for making a View for each item in the data rig .
See also:

  • ArrayAdapter
  • CursorAdapter
  • SimpleCursorAdapter

Summary

Constants

int IGNORE_ITEM_VIEW_TYPE
An token opinion character that causes the AdapterView to ignore the item view .
int NO_SELECTION

Public methods

default

CharSequence[]


getAutofillOptions()

Gets a string representation of the arranger data that can help AutofillService autofill the view backed by the arranger .

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 intend position in the data located .

abstract

long


getItemId(int position)

Get the row id associated with the specify situation in the number .

abstract

int


getItemViewType(int position)

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

abstract

View


getView(int position, View convertView, ViewGroup parent)

Get a view that displays the datum at the assign stead 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 perceiver that is called when changes happen to the data used by this arranger .

abstract

void


unregisterDataSetObserver(DataSetObserver observer)

Unregister an perceiver that has previously been registered with this arranger via registerDataSetObserver(DataSetObserver) .

Constants

IGNORE_ITEM_VIEW_TYPE

Added in API level 1

public static final int IGNORE_ITEM_VIEW_TYPE

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

  • getItemViewType(int)
  • getViewTypeCount()

ceaseless Value : -1 ( 0xffffffff )

NO_SELECTION

Added in API level 1

public static final int NO_SELECTION

changeless Value : -2147483648 ( 0x80000000 )

Public methods

getAutofillOptions

Added in API level 26

public CharSequence[] getAutofillOptions ()

Gets a string representation of the arranger data that can help AutofillService autofill the scene backed by the arranger. It should only be set ( i, non- null if the values do not represent PII ( Personally Identifiable Information – sensitive data such as electronic mail addresses, credit card numbers, passwords, etc … ). For exercise, it ‘s oklahoma to return a list of calendar month names, but not a list of usernames. A good convention of flick is that if the arranger data comes from static resources, such data is not PII – visit ViewStructure.setDataIsSensitive(boolean) for more information .

Returns
CharSequence[] null by default, unless implementations override it.

getCount

Added in API degree 1

public abstract int getCount ()

How many items are in the datum fixed represented by this Adapter .

Returns
int Count of items.

getItem

Added in API flat 1

public abstract Object getItem (int position)

Get the data detail associated with the specified position in the datum hardened .

Parameters
position int: Position of the item whose data we want within the adapter’s
data set.
Returns
Object The data at the specified position.

getItemId

Added in API charge 1

public abstract long getItemId (int position)

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

Parameters
position int: The position of the item within the adapter’s data set whose row id we want.
Returns
long The id of the item at the specified position.

getItemViewType

Added in API flush 1

public abstract int getItemViewType (int position)

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

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

See also:

  • IGNORE_ITEM_VIEW_TYPE

getView

Added in API level 1

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

Get a opinion that displays the data at the pin down stead in the datum set. You can either create a View manually or inflate it from an XML layout charge. When the View is inflated, the rear 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 rout .

Parameters
position int: The position of the item within the adapter’s data set of the item whose view
we want.
convertView View: 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 ViewGroup: The parent that this view will eventually be attached to
Returns
View A View corresponding to the data at the specified position.

getViewTypeCount

Added in API degree 1

public abstract 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 arranger always returns the same type of View for all items, this method acting should return 1 .
This method will lone be called when the arranger is set on the AdapterView .

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

hasStableIds

Added in API degree 1

public abstract boolean hasStableIds ()

Indicates whether the detail ids are stable across changes to the underlying data .

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

isEmpty

Added in API horizontal surface 1

public abstract boolean isEmpty ()
Returns
boolean 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.

registerDataSetObserver

Added in API grade 1

public abstract void registerDataSetObserver (DataSetObserver observer)

Register an perceiver that is called when changes happen to the data used by this arranger .

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

unregisterDataSetObserver

Added in API floor 1

public abstract void unregisterDataSetObserver (DataSetObserver observer)

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

Parameters
observer DataSetObserver: the object to unregister.
source : https://thefartiste.com
Category : Tech

About admin

I am the owner of the website thefartiste.com, my purpose is to bring all the most useful information to users.

Check Also

articlewriting1

Manage participants in a zoom meeting webinar

Call the people who attend the meet as follows Alternate host host Who scheduled the …

Leave a Reply

Your email address will not be published.