BaseAdapter

Kotlin |Java

abstract class BaseAdapter : ListAdapter, SpinnerAdapter

kotlin.Any
↳	android.widget.BaseAdapter

Known Direct Subclasses

ArrayAdapter, CursorAdapter, SimpleAdapter

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`.
CursorAdapter	Adapter that exposes data from a `Cursor` to a `ListView` widget.
SimpleAdapter	An easy adapter to map static data to views defined in an XML file.

Known Indirect Subclasses

ResourceCursorAdapter, SimpleCursorAdapter

ResourceCursorAdapter	An easy adapter that creates 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.

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

Public constructors
`BaseAdapter()`

Public methods
open Boolean	`areAllItemsEnabled()`
open Array<CharSequence!>?	`getAutofillOptions()`
open View!	`getDropDownView(position: Int, convertView: View!, parent: ViewGroup!)`
open Int	`getItemViewType(position: Int)`
open Int	`getViewTypeCount()`
open Boolean	`hasStableIds()`
open Boolean	`isEmpty()`
open Boolean	`isEnabled(position: Int)`
open Unit	`notifyDataSetChanged()` Notifies the attached observers that the underlying data has been changed and any View reflecting the data set should refresh itself.
open Unit	`notifyDataSetInvalidated()` Notifies the attached observers that the underlying data is no longer valid or available.
open Unit	`registerDataSetObserver(observer: DataSetObserver!)`
open Unit	`setAutofillOptions(vararg options: CharSequence!)` Sets the value returned by `getAutofillOptions()`
open Unit	`unregisterDataSetObserver(observer: DataSetObserver!)`

Public constructors

BaseAdapter

BaseAdapter()

Public methods

areAllItemsEnabled

Added in API level 1

open fun areAllItemsEnabled(): Boolean

Return
`Boolean`	True if all items are enabled, false otherwise.

getAutofillOptions

Added in API level 26

open fun getAutofillOptions(): Array<CharSequence!>?

Return
`Array<CharSequence!>?`	`null` by default, unless implementations override it.

getDropDownView

Added in API level 1

open fun getDropDownView(
    position: Int, 
    convertView: View!, 
    parent: ViewGroup!
): View!

Parameters
`position`	Int: index 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.
`parent`	ViewGroup!: the parent that this view will eventually be attached to

Return
`View!`	a `android.view.View` corresponding to the data at the specified position.

getItemViewType

Added in API level 1

open fun getItemViewType(position: Int): Int

Parameters
`position`	Int: The position of the item within the adapter's data set whose view type we want.

Return
`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`. Note: Integers must be in the range 0 to `getViewTypeCount` - 1. `IGNORE_ITEM_VIEW_TYPE` can also be returned.

getViewTypeCount

Added in API level 1

open fun getViewTypeCount(): Int

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

hasStableIds

Added in API level 1

open fun hasStableIds(): Boolean

Return
`Boolean`	True if the same id always refers to the same object.

isEmpty

Added in API level 1

open fun isEmpty(): Boolean

Return
`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.

isEnabled

Added in API level 1

open fun isEnabled(position: Int): Boolean

Parameters
`position`	Int: Index of the item

Return
`Boolean`	True if the item is not a separator

notifyDataSetChanged

Added in API level 1

open fun notifyDataSetChanged(): Unit

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

notifyDataSetInvalidated

Added in API level 1

open fun notifyDataSetInvalidated(): Unit

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.

registerDataSetObserver

Added in API level 1

open fun registerDataSetObserver(observer: DataSetObserver!): Unit

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

setAutofillOptions

Added in API level 27

open fun setAutofillOptions(vararg options: CharSequence!): Unit

Sets the value returned by getAutofillOptions()

Parameters
`options`	CharSequence!: This value may be `null`.

unregisterDataSetObserver

Added in API level 1

open fun unregisterDataSetObserver(observer: DataSetObserver!): Unit

Parameters
`observer`	DataSetObserver!: the object to unregister.