# Adapter Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) # Adapter *** ** * ** *** Kotlin \|[Java](https://developer.android.com/reference/android/widget/Adapter "View this page in Java") ``` interface Adapter ``` |--------------------------------------------------------------------------------------------------| | [android.widget.Adapter](https://developer.android.com/reference/kotlin/android/widget/Adapter#) | 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| Known Direct Subclasses [ListAdapter](https://developer.android.com/reference/kotlin/android/widget/ListAdapter), [SpinnerAdapter](https://developer.android.com/reference/kotlin/android/widget/SpinnerAdapter) |------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [ListAdapter](https://developer.android.com/reference/kotlin/android/widget/ListAdapter) | Extended [Adapter](https://developer.android.com/reference/kotlin/android/widget/Adapter#) that is the bridge between a [ListView](https://developer.android.com/reference/kotlin/android/widget/ListView) and the data that backs the list. | | [SpinnerAdapter](https://developer.android.com/reference/kotlin/android/widget/SpinnerAdapter) | Extended [Adapter](https://developer.android.com/reference/kotlin/android/widget/Adapter#) that is the bridge between a [android.widget.Spinner](https://developer.android.com/reference/kotlin/android/widget/Spinner) and its data. | | 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| Known Indirect Subclasses [ArrayAdapter](https://developer.android.com/reference/kotlin/android/widget/ArrayAdapter), [ArrayAdapter](https://developer.android.com/reference/kotlin/android/widget/ArrayAdapter), [ArrayAdapter](https://developer.android.com/reference/kotlin/android/widget/ArrayAdapter), [BaseAdapter](https://developer.android.com/reference/kotlin/android/widget/BaseAdapter), [BaseAdapter](https://developer.android.com/reference/kotlin/android/widget/BaseAdapter), [CursorAdapter](https://developer.android.com/reference/kotlin/android/widget/CursorAdapter), [CursorAdapter](https://developer.android.com/reference/kotlin/android/widget/CursorAdapter), [CursorAdapter](https://developer.android.com/reference/kotlin/android/widget/CursorAdapter), [HeaderViewListAdapter](https://developer.android.com/reference/kotlin/android/widget/HeaderViewListAdapter), [ResourceCursorAdapter](https://developer.android.com/reference/kotlin/android/widget/ResourceCursorAdapter), [ResourceCursorAdapter](https://developer.android.com/reference/kotlin/android/widget/ResourceCursorAdapter), [ResourceCursorAdapter](https://developer.android.com/reference/kotlin/android/widget/ResourceCursorAdapter), and 8 others. |--------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [ArrayAdapter](https://developer.android.com/reference/kotlin/android/widget/ArrayAdapter) | You can use this adapter to provide views for an [AdapterView](https://developer.android.com/reference/kotlin/android/widget/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](https://developer.android.com/reference/kotlin/android/widget/ListView) or [Spinner](https://developer.android.com/reference/kotlin/android/widget/Spinner). | | [ArrayAdapter](https://developer.android.com/reference/kotlin/android/widget/ArrayAdapter) | You can use this adapter to provide views for an [AdapterView](https://developer.android.com/reference/kotlin/android/widget/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](https://developer.android.com/reference/kotlin/android/widget/ListView) or [Spinner](https://developer.android.com/reference/kotlin/android/widget/Spinner). | | [ArrayAdapter](https://developer.android.com/reference/kotlin/android/widget/ArrayAdapter) | You can use this adapter to provide views for an [AdapterView](https://developer.android.com/reference/kotlin/android/widget/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](https://developer.android.com/reference/kotlin/android/widget/ListView) or [Spinner](https://developer.android.com/reference/kotlin/android/widget/Spinner). | | [BaseAdapter](https://developer.android.com/reference/kotlin/android/widget/BaseAdapter) | Common base class of common implementation for an [Adapter](https://developer.android.com/reference/kotlin/android/widget/Adapter#) that can be used in both [ListView](https://developer.android.com/reference/kotlin/android/widget/ListView) (by implementing the specialized [ListAdapter](https://developer.android.com/reference/kotlin/android/widget/ListAdapter) interface) and [Spinner](https://developer.android.com/reference/kotlin/android/widget/Spinner) (by implementing the specialized [SpinnerAdapter](https://developer.android.com/reference/kotlin/android/widget/SpinnerAdapter) interface). | | [BaseAdapter](https://developer.android.com/reference/kotlin/android/widget/BaseAdapter) | Common base class of common implementation for an [Adapter](https://developer.android.com/reference/kotlin/android/widget/Adapter#) that can be used in both [ListView](https://developer.android.com/reference/kotlin/android/widget/ListView) (by implementing the specialized [ListAdapter](https://developer.android.com/reference/kotlin/android/widget/ListAdapter) interface) and [Spinner](https://developer.android.com/reference/kotlin/android/widget/Spinner) (by implementing the specialized [SpinnerAdapter](https://developer.android.com/reference/kotlin/android/widget/SpinnerAdapter) interface). | | [CursorAdapter](https://developer.android.com/reference/kotlin/android/widget/CursorAdapter) | Adapter that exposes data from a [Cursor](https://developer.android.com/reference/kotlin/android/database/Cursor.html#) to a [ListView](https://developer.android.com/reference/kotlin/android/widget/ListView) widget. | | [CursorAdapter](https://developer.android.com/reference/kotlin/android/widget/CursorAdapter) | Adapter that exposes data from a [Cursor](https://developer.android.com/reference/kotlin/android/database/Cursor.html#) to a [ListView](https://developer.android.com/reference/kotlin/android/widget/ListView) widget. | | [CursorAdapter](https://developer.android.com/reference/kotlin/android/widget/CursorAdapter) | Adapter that exposes data from a [Cursor](https://developer.android.com/reference/kotlin/android/database/Cursor.html#) to a [ListView](https://developer.android.com/reference/kotlin/android/widget/ListView) widget. | | [HeaderViewListAdapter](https://developer.android.com/reference/kotlin/android/widget/HeaderViewListAdapter) | ListAdapter used when a ListView has header views. | | [ResourceCursorAdapter](https://developer.android.com/reference/kotlin/android/widget/ResourceCursorAdapter) | An easy adapter that creates views defined in an XML file. | | [ResourceCursorAdapter](https://developer.android.com/reference/kotlin/android/widget/ResourceCursorAdapter) | An easy adapter that creates views defined in an XML file. | | [ResourceCursorAdapter](https://developer.android.com/reference/kotlin/android/widget/ResourceCursorAdapter) | An easy adapter that creates views defined in an XML file. | | [SimpleAdapter](https://developer.android.com/reference/kotlin/android/widget/SimpleAdapter) | An easy adapter to map static data to views defined in an XML file. | | [SimpleAdapter](https://developer.android.com/reference/kotlin/android/widget/SimpleAdapter) | An easy adapter to map static data to views defined in an XML file. | | [SimpleAdapter](https://developer.android.com/reference/kotlin/android/widget/SimpleAdapter) | An easy adapter to map static data to views defined in an XML file. | | [SimpleCursorAdapter](https://developer.android.com/reference/kotlin/android/widget/SimpleCursorAdapter) | An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file. | | [SimpleCursorAdapter](https://developer.android.com/reference/kotlin/android/widget/SimpleCursorAdapter) | An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file. | | [SimpleCursorAdapter](https://developer.android.com/reference/kotlin/android/widget/SimpleCursorAdapter) | An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file. | | [ThemedSpinnerAdapter](https://developer.android.com/reference/kotlin/android/widget/ThemedSpinnerAdapter) | An extension of SpinnerAdapter that is capable of inflating drop-down views against a different theme than normal views. | | [WrapperListAdapter](https://developer.android.com/reference/kotlin/android/widget/WrapperListAdapter) | List adapter that wraps another list adapter. | | An Adapter object acts as a bridge between an [AdapterView](https://developer.android.com/reference/kotlin/android/widget/AdapterView) and the underlying data for that view. The Adapter provides access to the data items. The Adapter is also responsible for making a [android.view.View](https://developer.android.com/reference/kotlin/android/view/View.html#) for each item in the data set. ## Summary | Constants || |-----------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [IGNORE_ITEM_VIEW_TYPE](https://developer.android.com/reference/kotlin/android/widget/Adapter#IGNORE_ITEM_VIEW_TYPE:kotlin.Int) An item view type that causes the [AdapterView](https://developer.android.com/reference/kotlin/android/widget/AdapterView) to ignore the item view. | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [NO_SELECTION](https://developer.android.com/reference/kotlin/android/widget/Adapter#NO_SELECTION:kotlin.Int)
| | Public methods || |----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | open [Array](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html)\<[CharSequence](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-sequence/index.html)!\>? | [getAutofillOptions](https://developer.android.com/reference/kotlin/android/widget/Adapter#getAutofillOptions())`()` Gets a string representation of the adapter data that can help [android.service.autofill.AutofillService](https://developer.android.com/reference/kotlin/android/service/autofill/AutofillService.html#) autofill the view backed by the adapter. | | abstract [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [getCount](https://developer.android.com/reference/kotlin/android/widget/Adapter#getCount())`()` How many items are in the data set represented by this Adapter. | | abstract [Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html)! | [getItem](https://developer.android.com/reference/kotlin/android/widget/Adapter#getItem(kotlin.Int))`(`position:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Get the data item associated with the specified position in the data set. | | abstract [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html) | [getItemId](https://developer.android.com/reference/kotlin/android/widget/Adapter#getItemId(kotlin.Int))`(`position:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Get the row id associated with the specified position in the list. | | abstract [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [getItemViewType](https://developer.android.com/reference/kotlin/android/widget/Adapter#getItemViewType(kotlin.Int))`(`position:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Get the type of View that will be created by [getView](https://developer.android.com/reference/kotlin/android/widget/Adapter#getView(kotlin.Int,%20android.view.View,%20android.view.ViewGroup)) for the specified item. | | abstract [View](https://developer.android.com/reference/kotlin/android/view/View.html#)! | [getView](https://developer.android.com/reference/kotlin/android/widget/Adapter#getView(kotlin.Int,%20android.view.View,%20android.view.ViewGroup))`(`position:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`, `convertView:` `[View](https://developer.android.com/reference/kotlin/android/view/View.html#)!`, `parent:` `[ViewGroup](https://developer.android.com/reference/kotlin/android/view/ViewGroup.html#)!`)` Get a View that displays the data at the specified position in the data set. | | abstract [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [getViewTypeCount](https://developer.android.com/reference/kotlin/android/widget/Adapter#getViewTypeCount())`()` Returns the number of types of Views that will be created by [getView](https://developer.android.com/reference/kotlin/android/widget/Adapter#getView(kotlin.Int,%20android.view.View,%20android.view.ViewGroup)). | | abstract [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html) | [hasStableIds](https://developer.android.com/reference/kotlin/android/widget/Adapter#hasStableIds())`()` Indicates whether the item ids are stable across changes to the underlying data. | | abstract [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html) | [isEmpty](https://developer.android.com/reference/kotlin/android/widget/Adapter#isEmpty())`()`
| | abstract [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [registerDataSetObserver](https://developer.android.com/reference/kotlin/android/widget/Adapter#registerDataSetObserver(android.database.DataSetObserver))`(`observer:` `[DataSetObserver](https://developer.android.com/reference/kotlin/android/database/DataSetObserver.html#)!`)` Register an observer that is called when changes happen to the data used by this adapter. | | abstract [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [unregisterDataSetObserver](https://developer.android.com/reference/kotlin/android/widget/Adapter#unregisterDataSetObserver(android.database.DataSetObserver))`(`observer:` `[DataSetObserver](https://developer.android.com/reference/kotlin/android/database/DataSetObserver.html#)!`)` Unregister an observer that has previously been registered with this adapter via [registerDataSetObserver](https://developer.android.com/reference/kotlin/android/widget/Adapter#registerDataSetObserver(android.database.DataSetObserver)). | ## Constants ### IGNORE_ITEM_VIEW_TYPE Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static val IGNORE_ITEM_VIEW_TYPE: Int ``` An item view type that causes the [AdapterView](https://developer.android.com/reference/kotlin/android/widget/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,android.view.View,android.view.ViewGroup)](https://developer.android.com/reference/kotlin/android/widget/Adapter#getView(kotlin.Int,%20android.view.View,%20android.view.ViewGroup)). Value: -1 **See Also** - [#getItemViewType(int)](https://developer.android.com/reference/kotlin/android/widget/Adapter#getItemViewType(kotlin.Int)) - ### NO_SELECTION Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static val NO_SELECTION: Int ``` Value: -2147483648 ## Public methods ### getAutofillOptions Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` open fun getAutofillOptions(): Array? ``` Gets a string representation of the adapter data that can help [android.service.autofill.AutofillService](https://developer.android.com/reference/kotlin/android/service/autofill/AutofillService.html#) autofill the view backed by the adapter. It should only be set (i.e., non-`null` if the values do not represent PII (Personally Identifiable Information - sensitive data such as email addresses, credit card numbers, passwords, etc...). For example, it's ok to return a list of month names, but not a list of usernames. A good rule of thumb is that if the adapter data comes from static resources, such data is not PII - see [android.view.ViewStructure#setDataIsSensitive(boolean)](https://developer.android.com/reference/kotlin/android/view/ViewStructure.html#setDataIsSensitive(kotlin.Boolean)) for more info. | Return || |---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------| | [Array](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html)<[CharSequence](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char-sequence/index.html)!>? | `null` by default, unless implementations override it. | ### getCount Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun getCount(): Int ``` How many items are in the data set represented by this Adapter. | Return || |----------------------------------------------------------------------------|-----------------| | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | Count of items. | ### getItem Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun getItem(position: Int): Any! ``` Get the data item associated with the specified position in the data set. | Parameters || |------------|----------------------------------------------------------------------------------------------------------------------------------------------------| | `position` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html): Position of the item whose data we want within the adapter's data set. | | Return || |-----------------------------------------------------------------------------|-------------------------------------| | [Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html)! | The data at the specified position. | ### getItemId Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun getItemId(position: Int): Long ``` Get the row id associated with the specified position in the list. | Parameters || |------------|----------------------------------------------------------------------------------------------------------------------------------------------------------| | `position` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html): The position of the item within the adapter's data set whose row id we want. | | Return || |------------------------------------------------------------------------------|-----------------------------------------------| | [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html) | The id of the item at the specified position. | ### getItemViewType Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun getItemViewType(position: Int): Int ``` Get the type of View that will be created by [getView](https://developer.android.com/reference/kotlin/android/widget/Adapter#getView(kotlin.Int,%20android.view.View,%20android.view.ViewGroup)) for the specified item. | Parameters || |------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------| | `position` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html): The position of the item within the adapter's data set whose view type we want. | | Return || |----------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | An integer representing the type of View. Two views should share the same type if one can be converted to the other in [getView](https://developer.android.com/reference/kotlin/android/widget/Adapter#getView(kotlin.Int,%20android.view.View,%20android.view.ViewGroup)). Note: Integers must be in the range 0 to [getViewTypeCount](https://developer.android.com/reference/kotlin/android/widget/Adapter#getViewTypeCount()) - 1. [IGNORE_ITEM_VIEW_TYPE](https://developer.android.com/reference/kotlin/android/widget/Adapter#IGNORE_ITEM_VIEW_TYPE:kotlin.Int) can also be returned. | **See Also** - [#IGNORE_ITEM_VIEW_TYPE](https://developer.android.com/reference/kotlin/android/widget/Adapter#IGNORE_ITEM_VIEW_TYPE:kotlin.Int) ### getView Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun getView(     position: Int,     convertView: View!,     parent: ViewGroup! ): View! ``` 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 [android.view.LayoutInflater#inflate(int, android.view.ViewGroup, boolean)](https://developer.android.com/reference/kotlin/android/view/LayoutInflater.html#inflate(kotlin.Int,%20android.view.ViewGroup,%20kotlin.Boolean)) to specify a root view and to prevent attachment to the root. | Parameters || |---------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `position` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html): The position of the item within the adapter's data set of the item whose view we want. | | `convertView` | [View](https://developer.android.com/reference/kotlin/android/view/View.html#)!: 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()](https://developer.android.com/reference/kotlin/android/widget/Adapter#getViewTypeCount()) and [getItemViewType(int)](https://developer.android.com/reference/kotlin/android/widget/Adapter#getItemViewType(kotlin.Int))). | | `parent` | [ViewGroup](https://developer.android.com/reference/kotlin/android/view/ViewGroup.html#)!: The parent that this view will eventually be attached to | | Return || |---------------------------------------------------------------------------------|-------------------------------------------------------------| | [View](https://developer.android.com/reference/kotlin/android/view/View.html#)! | A View corresponding to the data at the specified position. | ### getViewTypeCount Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun getViewTypeCount(): Int ``` Returns the number of types of Views that will be created by [getView](https://developer.android.com/reference/kotlin/android/widget/Adapter#getView(kotlin.Int,%20android.view.View,%20android.view.ViewGroup)). Each type represents a set of views that can be converted in [getView](https://developer.android.com/reference/kotlin/android/widget/Adapter#getView(kotlin.Int,%20android.view.View,%20android.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 the adapter is set on the [AdapterView](https://developer.android.com/reference/kotlin/android/widget/AdapterView). | Return || |----------------------------------------------------------------------------|-------------------------------------------------------------------| | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | The number of types of Views that will be created by this adapter | ### hasStableIds Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun hasStableIds(): Boolean ``` Indicates whether the item ids are stable across changes to the underlying data. | Return || |------------------------------------------------------------------------------------|-------------------------------------------------------| | [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html) | True if the same id always refers to the same object. | ### isEmpty Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun isEmpty(): Boolean ``` | Return || |------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html) | 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 level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun registerDataSetObserver(observer: DataSetObserver!): Unit ``` Register an observer that is called when changes happen to the data used by this adapter. | Parameters || |------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `observer` | [DataSetObserver](https://developer.android.com/reference/kotlin/android/database/DataSetObserver.html#)!: the object that gets notified when the data set changes. | ### unregisterDataSetObserver Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun unregisterDataSetObserver(observer: DataSetObserver!): Unit ``` Unregister an observer that has previously been registered with this adapter via [registerDataSetObserver](https://developer.android.com/reference/kotlin/android/widget/Adapter#registerDataSetObserver(android.database.DataSetObserver)). | Parameters || |------------|--------------------------------------------------------------------------------------------------------------------------------------| | `observer` | [DataSetObserver](https://developer.android.com/reference/kotlin/android/database/DataSetObserver.html#)!: the object to unregister. |