Overview

Support classes providing low level Leanback user interface building blocks: widgets and helpers.

The core interface to the developer’s model is the ObjectAdapter. It is similar to Adapter and the RecyclerView Adapter, but separates iterating items from presenting them as Views. Concrete implementations include ArrayObjectAdapter and CursorObjectAdapter, but a developer is free to use a subclass of an ObjectAdapter to iterate over any existing Object hierarchy.

A Presenter creates Views and binds data from an Object to those Views. This is the complementary piece to ObjectAdapter that corresponds to existing Android adapter classes. The benefit to separating out a Presenter is that we can use it to generate Views outside of the context of an adapter. For example, a UI may represent data from a single Object in several places at once. Each View that needs to be generated can be produced by a different Presenter, while the Object is retrieved from the ObjectAdapter once.

A PresenterSelector determines which Presenter to use for a given Object from an ObjectAdapter. Two common cases are when an ObjectAdapter uses the same View type for every element (SinglePresenterSelector), and when the Presenter is determined by the Java class of the element (ClassPresenterSelector). A developer is able to implement any selection logic as a PresenterSelector. For example, if all the elements of an ObjectAdapter have the same type, but certain elements are to be rendered using a 'promotional content' view in the developer’s application, the PresenterSelector may inspect the fields of each element before choosing the appropriate Presenter.

The basic navigation model for Leanback is that of a vertical list of rows, each of which may be a horizontal list of items. Therefore, Leanback uses ObjectAdapters both for defining the horizontal data items as well as the list of rows themselves.

Leanback defines a few basic data model classes for rows: the Row, which defines the abstract concept of a row with a header; and ListRow, a concrete Row implementation that uses an ObjectAdapter to present a horizontal list of items. The corresponding presenter for the ListRow is the ListRowPresenter.

Other types of Rows and corresponding RowPresenters are provided; however the application may define a custom subclass of Row and RowPresenter.

Interfaces

BaseGridView.OnKeyInterceptListener	Listener for intercepting key dispatch events.
BaseGridView.OnLayoutCompletedListener	Interface for receiving notification when BaseGridView has completed a full layout calculation.
BaseGridView.OnMotionInterceptListener	Listener for intercepting generic motion dispatch events.
BaseGridView.OnTouchInterceptListener	Listener for intercepting touch dispatch events.
BaseGridView.OnUnhandledKeyListener	Listener for intercepting unhandled key events.
BaseGridView.SmoothScrollByBehavior	Defines behavior of duration and interpolator for smoothScrollBy().
BaseOnItemViewClickedListener<T>	Interface for receiving notification when an item view holder is clicked.
BaseOnItemViewSelectedListener<T>	Interface for receiving notification when a row or item becomes selected.
BrowseFrameLayout.OnChildFocusListener	Interface for managing child focus in a BrowseFrameLayout.
BrowseFrameLayout.OnFocusSearchListener	Interface for selecting a focused view in a BrowseFrameLayout when the system focus finder couldn't find a view to focus.
FacetProvider	This is the query interface to supply optional features(aka facets) on an object without the need of letting the object to subclass or implement java interfaces.
FacetProviderAdapter	Optional interface that implemented by RecyclerView.Adapter to query FacetProvider for a given item view type within Adapter.
FocusHighlight	Interface for highlighting the item that has focus.
FragmentAnimationProvider	FragmentAnimationProvider supplies animations for use during a fragment's onCreateAnimator callback.
GuidedActionAdapter.ClickListener	Object listening for click events within a GuidedActionAdapter.
GuidedActionAdapter.EditListener	Object listening for edit events within a GuidedActionAdapter.
GuidedActionAdapter.FocusListener	Object listening for focus events within a GuidedActionAdapter.
GuidedActionAutofillSupport	Interface for a custom EditText subclass to support autofill in GuidedStepSupportFragment.
GuidedActionAutofillSupport.OnAutofillListener	Listener for autofill event.
ImeKeyMonitor	Interface for an EditText subclass that can delegate calls to onKeyPreIme up to a registered listener.
ImeKeyMonitor.ImeKeyListener	Listener interface for key events intercepted pre-IME by edit text objects.
MultiActionsProvider	An interface implemented by the user if they wish to provide actions for a media item row to be displayed by an AbstractMediaItemPresenter.
OnActionClickedListener	Interface for receiving notification when an Action is clicked.
OnChildLaidOutListener	Interface for receiving notification when a child of this ViewGroup has been laid out.
OnChildSelectedListener	Interface for receiving notification when a child of this ViewGroup has been selected.
OnItemViewClickedListener	Interface for receiving notification when a item view holder is clicked.
OnItemViewSelectedListener	Interface for receiving notification when a row or item becomes selected.
PlaybackSeekUi	Interface to be implemented by UI component to support seeking.
PlaybackTransportRowView.OnUnhandledKeyListener
SearchBar.SearchBarListener	Interface for receiving notification of search query changes.
SearchBar.SearchBarPermissionListener	Interface that handles runtime permissions requests.
SearchEditText.OnKeyboardDismissListener	Interface for receiving notification when the keyboard is dismissed.
SpeechRecognitionCallback	Interface for receiving notification that speech recognition should be initiated.
TitleViewAdapter.Provider	Interface to be implemented by a customized widget class to implement TitleViewAdapter.
ViewHolderTask	Interface for schedule task on a ViewHolder.

Classes

AbstractDetailsDescriptionPresenter	An abstract Presenter for rendering a detailed description of an item.
AbstractDetailsDescriptionPresenter.ViewHolder	The ViewHolder for the AbstractDetailsDescriptionPresenter.
AbstractMediaItemPresenter	Abstract Presenter class for rendering media items in a playlist format.
AbstractMediaItemPresenter.ViewHolder	The ViewHolder for the AbstractMediaItemPresenter.
AbstractMediaListHeaderPresenter	Abstract presenter class for rendering the header for a list of media items in a playlist.
AbstractMediaListHeaderPresenter.ViewHolder	The ViewHolder for the AbstractMediaListHeaderPresenter.
Action	An action contains one or two lines of text, an optional image and an optional id.
ArrayObjectAdapter	An ObjectAdapter implemented with an java.util.ArrayList.
BackgroundHelper	Helper for view backgrounds.
BaseCardView	A card style layout that responds to certain state changes.
BaseCardView.LayoutParams	Per-child layout information associated with BaseCardView.
BaseGridView	An abstract base class for vertically and horizontally scrolling lists.
BrowseFrameLayout	A ViewGroup for managing focus behavior between overlapping views.
BrowseRowsFrameLayout	Customized FrameLayout excludes margin of child from calculating the child size.
ClassPresenterSelector	A ClassPresenterSelector selects a Presenter based on the item's Java class.
ControlButtonPresenterSelector	Displays primary and secondary controls for a PlaybackControlsRow.
CursorObjectAdapter	An ObjectAdapter implemented with a .
DetailsOverviewLogoPresenter	Presenter that responsible to create a ImageView and bind to DetailsOverviewRow.
DetailsOverviewLogoPresenter.ViewHolder	ViewHolder for Logo view of DetailsOverviewRow.
DetailsOverviewRow	An overview Row for a details fragment.
DetailsOverviewRow.Listener	Listener for changes of DetailsOverviewRow.
DetailsOverviewRowPresenter	Renders a DetailsOverviewRow to display an overview of an item.
DetailsOverviewRowPresenter.ViewHolder	A ViewHolder for the DetailsOverviewRow.
DetailsParallax	Subclass of Parallax object that tracks overview row's top and bottom edge in DetailsFragment or DetailsSupportFragment.
DetailsParallaxDrawable	Helper class responsible for wiring in parallax effect in DetailsFragment.
DiffCallback<Value>	Callback that informs ArrayObjectAdapter how to compute list updates when using DiffUtil in ArrayObjectAdapter.setItems(List, DiffCallback) method.
DividerPresenter	DividerPresenter provides a default presentation for DividerRow in HeadersFragment.
DividerRow	Used to represent divider in HeadersFragment.
FocusHighlightHelper	Sets up the highlighting behavior when an item gains focus.
FullWidthDetailsOverviewRowPresenter	Renders a DetailsOverviewRow to display an overview of an item.
FullWidthDetailsOverviewRowPresenter.Listener	Listeners for events on ViewHolder.
FullWidthDetailsOverviewRowPresenter.ViewHolder	A ViewHolder for the DetailsOverviewRow.
FullWidthDetailsOverviewRowPresenter.ViewHolder.DetailsOverviewRowListener
FullWidthDetailsOverviewSharedElementHelper	Helper class to assist delayed shared element activity transition for view created by FullWidthDetailsOverviewRowPresenter.
GridLayoutManager	A implementation that lays out items in a grid for leanback VerticalGridView and HorizontalGridView.
GuidanceStylist	GuidanceStylist is used within a GuidedStepFragment to display contextual information for the decision(s) required at that step.
GuidanceStylist.Guidance	A data class representing contextual information for a GuidedStepFragment.
GuidedAction	A data class which represents an action within a GuidedStepFragment.
GuidedAction.Builder	Builds a GuidedAction object.
GuidedAction.BuilderBase<B>	Base builder class to build a GuidedAction object.
GuidedActionAdapter	GuidedActionAdapter instantiates views for guided actions, and manages their interactions.
GuidedActionAdapterGroup	Internal implementation manages a group of GuidedActionAdapters, control the next action after editing finished, maintain the Ime open/close status.
GuidedActionAppCompatEditText	A custom EditText that satisfies the IME key monitoring requirements of GuidedStepFragment.
GuidedActionDiffCallback	DiffCallback used for GuidedActions, see GuidedStepSupportFragment.setActionsDiffCallback(DiffCallback).
GuidedActionEditText	A custom EditText that satisfies the IME key monitoring requirements of GuidedStepFragment.
GuidedActionsStylist	GuidedActionsStylist is used within a GuidedStepFragment to supply the right-side panel where users can take actions.
GuidedActionsStylist.ViewHolder	ViewHolder caches information about the action item layouts' subviews.
GuidedDatePickerAction	Subclass of GuidedAction that can choose a date.
GuidedDatePickerAction.Builder	Builder class to build a GuidedDatePickerAction.
GuidedDatePickerAction.BuilderBase<B>	Base Builder class to build GuidedDatePickerAction.
HeaderItem	A header item describes the metadata of a Row, such as a category of media items.
HorizontalGridView	A android.view.ViewGroup that shows items in a horizontal scrolling list.
HorizontalHoverCardSwitcher	A helper class for showing a hover card view below a HorizontalGridView.
ImageCardView	A subclass of BaseCardView with an ImageView as its main region.
InvisibleRowPresenter
ItemAlignmentFacet	Optional facet provided by RecyclerView.Adapter or RecyclerView.ViewHolder for use in HorizontalGridView and VerticalGridView.
ItemAlignmentFacet.ItemAlignmentDef	Definition of an alignment position under a view.
ItemBridgeAdapter	Bridge from Presenter to .
ItemBridgeAdapter.AdapterListener	Interface for listening to ViewHolder operations.
ItemBridgeAdapter.ViewHolder	ViewHolder for the ItemBridgeAdapter.
ItemBridgeAdapter.Wrapper	Interface for wrapping a view created by a Presenter into another view.
ItemBridgeAdapterShadowOverlayWrapper	A wrapper class working with ItemBridgeAdapter to wrap item view in a ShadowOverlayContainer.
LeanbackAppCompatViewInflater	Inflater that converts leanback non-AppCpmpat views in layout to AppCompat versions.
ListRow	A Row composed of a optional HeaderItem, and an ObjectAdapter describing the items in the list.
ListRowHoverCardView	ListRowHoverCardView contains a title and description.
ListRowPresenter	ListRowPresenter renders ListRow using a HorizontalGridView hosted in a ListRowView.
ListRowPresenter.SelectItemViewHolderTask	A task on the ListRowPresenter.ViewHolder that can select an item by position in the HorizontalGridView and perform an optional item task on it.
ListRowPresenter.ViewHolder	ViewHolder for the ListRowPresenter.
ListRowView	ListRowView is a android.view.ViewGroup which always contains a HorizontalGridView, and may optionally include a hover card.
MediaNowPlayingView	The view displaying 3 animated peak meters next to each other when a media item is playing.
MultiActionsProvider.MultiAction	MultiAction represents an action that can have multiple states.
NonOverlappingLinearLayout
ObjectAdapter	Base class adapter to be used in leanback activities.
ObjectAdapter.DataObserver	A DataObserver can be notified when an ObjectAdapter's underlying data changes.
OnChildViewHolderSelectedListener	Interface for receiving notification when a child of this ViewGroup has been selected.
PageRow	Used to represent content spanning full page.
PagingIndicator	A page indicator with dots.
PagingIndicator.Dot
Parallax<PropertyT>	Parallax tracks a list of dynamic s typically representing foreground UI element positions on screen.
Parallax.FloatProperty	FloatProperty provide access to an index based integer type property inside Parallax.
Parallax.IntProperty	IntProperty provide access to an index based integer type property inside Parallax.
Parallax.PropertyMarkerValue<PropertyT>	Class holding a fixed value for a Property in Parallax.
ParallaxEffect	ParallaxEffect class drives changes in ParallaxTarget in response to changes in variables defined in Parallax.
ParallaxTarget	ParallaxTarget is responsible for updating the target through the ParallaxTarget.update(float) method or the ParallaxTarget.directUpdate(Number) method when ParallaxTarget.isDirectMapping() is true.
ParallaxTarget.DirectPropertyTarget<T, V>	DirectPropertyTarget is to support direct mapping into either Integer Property or Float Property.
ParallaxTarget.PropertyValuesHolderTarget	PropertyValuesHolderTarget is an implementation of ParallaxTarget that uses to update the target object.
PlaybackControlsRow	A Row of playback controls to be displayed by a PlaybackControlsRowPresenter.
PlaybackControlsRow.ClosedCaptioningAction	An action for displaying a CC (Closed Captioning) icon.
PlaybackControlsRow.FastForwardAction	An action displaying an icon for fast forward.
PlaybackControlsRow.HighQualityAction	An action for displaying a HQ (High Quality) icon.
PlaybackControlsRow.MoreActions	An action displaying an icon for "more actions".
PlaybackControlsRow.MultiAction	Base class for an action comprised of a series of icons.
PlaybackControlsRow.OnPlaybackProgressCallback	Listener for progress or duration change.
PlaybackControlsRow.PictureInPictureAction	An action displaying an icon for picture-in-picture.
PlaybackControlsRow.PlayPauseAction	An action displaying icons for play and pause.
PlaybackControlsRow.RepeatAction	An action for displaying three repeat states: none, one, or all.
PlaybackControlsRow.RewindAction	An action displaying an icon for rewind.
PlaybackControlsRow.ShuffleAction	An action for displaying a shuffle icon.
PlaybackControlsRow.SkipNextAction	An action displaying an icon for skip next.
PlaybackControlsRow.SkipPreviousAction	An action displaying an icon for skip previous.
PlaybackControlsRow.ThumbsAction	A base class for displaying a thumbs action.
PlaybackControlsRow.ThumbsDownAction	An action displaying an icon for thumbs down.
PlaybackControlsRow.ThumbsUpAction	An action displaying an icon for thumbs up.
PlaybackControlsRowPresenter	A PlaybackControlsRowPresenter renders a PlaybackControlsRow to display a series of playback control buttons.
PlaybackControlsRowPresenter.ViewHolder	A ViewHolder for the PlaybackControlsRow.
PlaybackRowPresenter	Subclass of RowPresenter that can define the desired behavior when the view reappears.
PlaybackRowPresenter.ViewHolder	This container is used for trapping click events and passing them to the playback controls.
PlaybackSeekDataProvider	Class to be implemented by app to provide seeking data and thumbnails to UI.
PlaybackSeekDataProvider.ResultCallback	Client to receive result for PlaybackSeekDataProvider.getThumbnail(int, PlaybackSeekDataProvider.ResultCallback).
PlaybackSeekUi.Client	Client (e.g.
PlaybackTransportRowPresenter	A PlaybackTransportRowPresenter renders a PlaybackControlsRow to display a series of playback control buttons.
PlaybackTransportRowPresenter.ViewHolder	A ViewHolder for the PlaybackControlsRow supporting seek UI.
PlaybackTransportRowView	View for PlaybackTransportRowPresenter that has a custom focusSearch.
Presenter	A Presenter is used to generate Views and bind Objects to them on demand.
Presenter.ViewHolder	ViewHolder can be subclassed and used to cache any view accessors needed to improve binding performance (for example, results of findViewById) without needing to subclass a View.
Presenter.ViewHolderTask	Base class to perform a task on Presenter.ViewHolder.
PresenterSelector	A PresenterSelector is used to obtain a Presenter for a given Object.
PresenterSwitcher	An abstract helper class that switches a view in its parent view using a PresenterSelector.
RecyclerViewParallax	Implementation of Parallax class for RecyclerView.
RecyclerViewParallax.ChildPositionProperty	Subclass of Parallax.IntProperty.
Row	The base class for all rows.
RowHeaderPresenter	RowHeaderPresenter provides a default presentation for HeaderItem using a RowHeaderView and optionally a TextView for description.
RowHeaderPresenter.ViewHolder	A ViewHolder for the RowHeaderPresenter.
RowHeaderView	RowHeaderView is a header text view.
RowPresenter	An abstract Presenter that renders an Object in RowsFragment, the object can be subclass Row or a generic one.
RowPresenter.ViewHolder	A ViewHolder for a Row.
ScaleFrameLayout	Subclass of FrameLayout that support scale layout area size for children.
SearchBar	A search widget containing a search orb and a text entry view.
SearchEditText	EditText widget that monitors keyboard changes.
SearchOrbView	A widget that draws a search affordance, represented by a round background and an icon.
SearchOrbView.Colors	A set of colors used to display the search orb.
SectionRow	Used to represent section item in HeadersFragment.
SeekBar	Replacement of SeekBar, has two bar heights and two thumb size when focused/not_focused.
SeekBar.AccessibilitySeekListener
ShadowOverlayContainer	Provides an SDK version-independent wrapper to support shadows, color overlays, and rounded corners.
ShadowOverlayHelper	ShadowOverlayHelper is a helper class for shadow, overlay color and rounded corner.
ShadowOverlayHelper.Builder	Builder for creating ShadowOverlayHelper.
ShadowOverlayHelper.Options	Option values for ShadowOverlayContainer.
SinglePresenterSelector	A PresenterSelector that always returns the same Presenter.
SparseArrayObjectAdapter	An ObjectAdapter implemented with a .
SpeechOrbView	A subclass of SearchOrbView that visualizes the state of an ongoing speech recognition.
ThumbsBar
TitleHelper	Helper for managing TitleView, including transitions and focus movement.
TitleView	Title view for a leanback fragment.
TitleViewAdapter	This class allows a customized widget class to implement TitleViewAdapter.Provider and expose TitleViewAdapter methods to containing fragment (e.g.
Util
VerticalGridPresenter	A presenter that renders objects in a VerticalGridView.
VerticalGridPresenter.ViewHolder	ViewHolder for the VerticalGridPresenter.
VerticalGridView	A android.view.ViewGroup that shows items in a vertically scrolling list.
VideoSurfaceView	Activity transition will change transitionVisibility multiple times even the view is not running transition, which causes visual flickering during activity return transition.

Annotation Types

Visibility