AbstractMediaItemPresenter

Artifact: androidx.leanback:leanback

View Source

Added in 1.1.0

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Kotlin |Java

abstract class AbstractMediaItemPresenter : RowPresenter

kotlin.Any
↳	androidx.leanback.widget.Presenter
	↳	androidx.leanback.widget.RowPresenter
		↳	androidx.leanback.widget.AbstractMediaItemPresenter

---

Abstract Presenter class for rendering media items in a playlist format. Media item data provided for this presenter can implement the interface MultiActionsProvider, if the media rows wish to contain custom actions. Media items in the playlist are arranged as a vertical list with each row holding each media item's details provided by the user of this class and a set of optional custom actions. Each media item's details and actions are separately focusable. The appearance of each one of the media row components can be controlled through setting theme's attributes. Each media item row provides a view flipper for switching between different views depending on the playback state. A default layout is provided by this presenter for rendering different playback states, or a custom layout can be provided by the user by overriding the playbackMediaItemNumberViewFlipperLayout attribute in the currently specified theme. Subclasses should also override getMediaPlayState to provide the current play state of their media item model in case they wish to use different views depending on the playback state. The presenter can optionally provide line separators between media rows by setting setHasMediaRowSeparator to true.

Subclasses must override onBindMediaDetails to implement their media item model data binding to each row view.

The OnItemViewClickedListener and OnItemViewSelectedListener can be used in the same fashion to handle selection or click events on either of media details or each individual action views.

AbstractMediaListHeaderPresenter can be used in conjunction with this presenter in order to display a playlist with a header view.

Summary

Nested types
class AbstractMediaItemPresenter.ViewHolder : RowPresenter.ViewHolder The ViewHolder for the AbstractMediaItemPresenter.

Constants
const Int	PLAY_STATE_INITIAL = 0 Indicating that the media item is currently neither playing nor paused.
const Int	PLAY_STATE_PAUSED = 1 Indicating that the media item is currently paused.
const Int	PLAY_STATE_PLAYING = 2 Indicating that the media item is currently playing

Public constructors
AbstractMediaItemPresenter() Constructor used for creating an abstract media item presenter.
AbstractMediaItemPresenter(themeId: Int) Constructor used for creating an abstract media item presenter.

Public functions
Presenter!	getActionPresenter() Return the presenter used to render a media item row actions.
Int	getThemeId() Return The resource id of the theme that defines attributes controlling the appearance of different widgets in a media item row.
Boolean	hasMediaRowSeparator()
Boolean	isUsingDefaultSelectEffect() Returns true if this RowPresenter is using the default dimming effect.
Unit	onBindMediaPlayState(vh: AbstractMediaItemPresenter.ViewHolder!) Binds the media item number view to the appropriate play state view of the media item.
Unit	onUnbindMediaPlayState(vh: AbstractMediaItemPresenter.ViewHolder!) Called when the given ViewHolder wants to unbind the play state view.
Unit	setActionPresenter(actionPresenter: Presenter!) Sets the action presenter rendering each optional custom action within each media item row.
Unit	setBackgroundColor(color: Int) Sets the background color for the row views within the playlist.
Unit	setHasMediaRowSeparator(hasSeparator: Boolean) Specifies whether a line separator should be used between media item rows.
Unit	setThemeId(themeId: Int) Sets the theme used to style a media item row components.

Protected functions
RowPresenter.ViewHolder!	createRowViewHolder(parent: ViewGroup!) Called to create a ViewHolder object for a Row.
Int	getMediaPlayState(item: Any!) Returns the current play state of the given media item.
Boolean	isClippingChildren() Returns true if the Row view should clip its children.
abstract Unit	onBindMediaDetails(vh: AbstractMediaItemPresenter.ViewHolder!, item: Any!) Binds the media item details to their views provided by the AbstractMediaItemPresenter.
Unit	onBindRowActions(vh: AbstractMediaItemPresenter.ViewHolder!) Binds the given media item object action to the given ViewHolder's action views.
Unit	onBindRowViewHolder(vh: RowPresenter.ViewHolder, item: Any) Binds the given row object to the given ViewHolder.
Unit	onUnbindMediaDetails(vh: AbstractMediaItemPresenter.ViewHolder!) Unbinds the media item details from their views provided by the AbstractMediaItemPresenter.

Inherited Constants

From androidx.leanback.widget.RowPresenter const Int SYNC_ACTIVATED_CUSTOM = 0 Don't synchronize row view activated status with selected status or expanded status, application will do its own through setActivated. const Int SYNC_ACTIVATED_TO_EXPANDED = 1 Synchronizes row view's activated status to expand status of the row view holder. const Int SYNC_ACTIVATED_TO_EXPANDED_AND_SELECTED = 3 Sets the row view's activated status to true when both expand and selected are true. const Int SYNC_ACTIVATED_TO_SELECTED = 2 Synchronizes row view's activated status to selected status of the row view holder.

Inherited functions
From androidx.leanback.widget.FacetProvider abstract Any? getFacet(facetClass: Class<Any!>) Queries optional implemented facet.
From androidx.leanback.widget.Presenter java-static Unit cancelAnimationsRecursive(view: View!) Utility method for removing all running animations on a view. Any! getFacet(facetClass: Class<Any!>!) Queries optional implemented facet. abstract Unit onBindViewHolder(viewHolder: Presenter.ViewHolder, item: Any?) Binds a View to an item. Unit onBindViewHolder(     viewHolder: Presenter.ViewHolder,     item: Any,     payloads: (Mutable)List<Any!> ) Binds a View to an item with a list of payloads. abstract Presenter.ViewHolder onCreateViewHolder(parent: ViewGroup) Creates a new View. abstract Unit onUnbindViewHolder(viewHolder: Presenter.ViewHolder) Unbinds a View from an item. Unit onViewAttachedToWindow(holder: Presenter.ViewHolder) Called when a view created by this presenter has been attached to a window. Unit onViewDetachedFromWindow(holder: Presenter.ViewHolder) Called when a view created by this presenter has been detached from its window. Unit setFacet(facetClass: Class<Any!>!, facetImpl: Any!) Sets dynamic implemented facet in addition to basic Presenter functions. Unit setOnClickListener(     holder: Presenter.ViewHolder!,     listener: View.OnClickListener! ) Called to set a click listener for the given view holder.
From androidx.leanback.widget.RowPresenter Unit dispatchItemSelectedListener(     vh: RowPresenter.ViewHolder!,     selected: Boolean ) This method is only called from onRowViewSelected onRowViewSelected. Unit freeze(holder: RowPresenter.ViewHolder, freeze: Boolean) Freezes/unfreezes the row, typically used when a transition starts/ends. RowHeaderPresenter! getHeaderPresenter() Returns the Presenter used for rendering the header, or null if none has been set. RowPresenter.ViewHolder! getRowViewHolder(holder: Presenter.ViewHolder!) Returns the RowPresenter.ViewHolder from the given RowPresenter ViewHolder. Boolean getSelectEffectEnabled() Returns true if the row selection effect is enabled. Float getSelectLevel(vh: Presenter.ViewHolder!) Returns the current select level. Int getSyncActivatePolicy() Returns the policy of updating row view activated status. Unit initializeRowViewHolder(vh: RowPresenter.ViewHolder!) Called after a RowPresenter.ViewHolder is created for a Row. Unit onBindViewHolder(viewHolder: Presenter.ViewHolder, item: Any?) Binds a View to an item. Presenter.ViewHolder! onCreateViewHolder(parent: ViewGroup!) Creates a new View. Unit onRowViewAttachedToWindow(vh: RowPresenter.ViewHolder) Invoked when the row view is attached to the window. Unit onRowViewDetachedFromWindow(vh: RowPresenter.ViewHolder) Invoked when the row view is detached from the window. Unit onRowViewExpanded(vh: RowPresenter.ViewHolder!, expanded: Boolean) Called when the row view's expanded state changes. Unit onRowViewSelected(vh: RowPresenter.ViewHolder, selected: Boolean) Called when the given row view changes selection state. Unit onSelectLevelChanged(vh: RowPresenter.ViewHolder!) Callback when the select level changes. Unit onUnbindRowViewHolder(vh: RowPresenter.ViewHolder) Unbinds the given ViewHolder. Unit onUnbindViewHolder(viewHolder: Presenter.ViewHolder) Unbinds a View from an item. Unit onViewAttachedToWindow(holder: Presenter.ViewHolder) Called when a view created by this presenter has been attached to a window. Unit onViewDetachedFromWindow(holder: Presenter.ViewHolder) Called when a view created by this presenter has been detached from its window. Unit setEntranceTransitionState(     holder: RowPresenter.ViewHolder,     afterEntrance: Boolean ) Changes the visibility of views. Unit setHeaderPresenter(headerPresenter: RowHeaderPresenter!) Sets the Presenter used for rendering the header. Unit setRowViewExpanded(holder: Presenter.ViewHolder!, expanded: Boolean) Sets the expanded state of a Row view. Unit setRowViewSelected(holder: Presenter.ViewHolder!, selected: Boolean) Sets the selected state of a Row view. Unit setSelectEffectEnabled(applyDimOnSelect: Boolean) Enables or disables the row selection effect. Unit setSelectLevel(vh: Presenter.ViewHolder!, level: Float) Sets the current select level to a value between 0 (unselected) and 1 (selected). Unit setSyncActivatePolicy(syncActivatePolicy: Int) Sets the policy of updating row view activated status.

Constants

PLAY_STATE_INITIAL

Added in 1.1.0

const val PLAY_STATE_INITIAL = 0: Int

Indicating that the media item is currently neither playing nor paused.

PLAY_STATE_PAUSED

Added in 1.1.0

const val PLAY_STATE_PAUSED = 1: Int

Indicating that the media item is currently paused.

PLAY_STATE_PLAYING

Added in 1.1.0

const val PLAY_STATE_PLAYING = 2: Int

Indicating that the media item is currently playing

Public constructors

AbstractMediaItemPresenter

Added in 1.1.0

AbstractMediaItemPresenter()

Constructor used for creating an abstract media item presenter.

AbstractMediaItemPresenter

Added in 1.1.0

AbstractMediaItemPresenter(themeId: Int)

Constructor used for creating an abstract media item presenter.

Parameters
themeId: Int	The resource id of the theme that defines attributes controlling the appearance of different widgets in a media item row.

Public functions

getActionPresenter

Added in 1.1.0

fun getActionPresenter(): Presenter!

Return the presenter used to render a media item row actions.

Returns
Presenter!	the presenter used to render a media item row actions.

getThemeId

Added in 1.1.0

fun getThemeId(): Int

Return The resource id of the theme that defines attributes controlling the appearance of different widgets in a media item row.

Returns
Int	The resource id of the theme that defines attributes controlling the appearance of different widgets in a media item row.

hasMediaRowSeparator

Added in 1.1.0

fun hasMediaRowSeparator(): Boolean

isUsingDefaultSelectEffect

fun isUsingDefaultSelectEffect(): Boolean

Returns true if this RowPresenter is using the default dimming effect. A subclass may (most likely) return false and override onSelectLevelChanged.

onBindMediaPlayState

Added in 1.1.0

fun onBindMediaPlayState(vh: AbstractMediaItemPresenter.ViewHolder!): Unit

Binds the media item number view to the appropriate play state view of the media item. The play state of the media item is extracted by calling getMediaPlayState for the media item embedded within this view. This method triggers updating of the playback state UI if corresponding views are specified for the current playback state. By default, 3 views are provided for each playback state, or these views can be provided by the user.

onUnbindMediaPlayState

Added in 1.1.0

fun onUnbindMediaPlayState(vh: AbstractMediaItemPresenter.ViewHolder!): Unit

Called when the given ViewHolder wants to unbind the play state view.

Parameters
vh: AbstractMediaItemPresenter.ViewHolder!	The ViewHolder to unbind from.

setActionPresenter

Added in 1.1.0

fun setActionPresenter(actionPresenter: Presenter!): Unit

Sets the action presenter rendering each optional custom action within each media item row.

Parameters
actionPresenter: Presenter!	the presenter to be used for rendering a media item row actions.

setBackgroundColor

Added in 1.1.0

fun setBackgroundColor(color: Int): Unit

Sets the background color for the row views within the playlist. If this is not set, a default color, defaultBrandColor, from theme is used. This defaultBrandColor defaults to android:attr/colorPrimary on v21, if it's specified.

Parameters
color: Int	The ARGB color used to set as the media list background color.

setHasMediaRowSeparator

Added in 1.1.0

fun setHasMediaRowSeparator(hasSeparator: Boolean): Unit

Specifies whether a line separator should be used between media item rows.

Parameters
hasSeparator: Boolean	true if a separator should be displayed, false otherwise.

setThemeId

Added in 1.1.0

fun setThemeId(themeId: Int): Unit

Sets the theme used to style a media item row components.

Parameters
themeId: Int	The resource id of the theme that defines attributes controlling the appearance of different widgets in a media item row.

Protected functions

createRowViewHolder

protected fun createRowViewHolder(parent: ViewGroup!): RowPresenter.ViewHolder!

Called to create a ViewHolder object for a Row. Subclasses will override this method to return a different concrete ViewHolder object.

Parameters
parent: ViewGroup!	The parent View for the Row's view holder.

Returns
RowPresenter.ViewHolder!	A ViewHolder for the Row's View.

getMediaPlayState

Added in 1.1.0

protected fun getMediaPlayState(item: Any!): Int

Returns the current play state of the given media item. By default, this method returns PLAY_STATE_INITIAL which causes the media item number getMediaItemNameView to be displayed for different playback states. Users of this class should override this method in order to provide the play state of their custom media item data model.

Parameters
item: Any!	The media item

Returns
Int	The current play state of this media item

isClippingChildren

protected fun isClippingChildren(): Boolean

Returns true if the Row view should clip its children. The clipChildren flag is set on view in initializeRowViewHolder. Note that Slide transition or explode transition need turn off clipChildren. Default value is false.

onBindMediaDetails

Added in 1.1.0

protected abstract fun onBindMediaDetails(vh: AbstractMediaItemPresenter.ViewHolder!, item: Any!): Unit

Binds the media item details to their views provided by the AbstractMediaItemPresenter. This method is to be overridden by the users of this presenter. The subclasses of this presenter can access and bind individual views for either of the media item number, name, or duration (depending on whichever views are visible according to the providing theme attributes), by calling getMediaItemNumberView, getMediaItemNameView, and getMediaItemDurationView, on the ViewHolder provided as the argument vh of this presenter.

Parameters
vh: AbstractMediaItemPresenter.ViewHolder!	The ViewHolder for this AbstractMediaItemPresenter.
item: Any!	The media item row object being presented.

onBindRowActions

Added in 1.1.0

protected fun onBindRowActions(vh: AbstractMediaItemPresenter.ViewHolder!): Unit

Binds the given media item object action to the given ViewHolder's action views.

Parameters
vh: AbstractMediaItemPresenter.ViewHolder!	ViewHolder for the media item.

onBindRowViewHolder

protected fun onBindRowViewHolder(vh: RowPresenter.ViewHolder, item: Any): Unit

Binds the given row object to the given ViewHolder. Derived classes of RowPresenter overriding onBindRowViewHolder must call through the super class's implementation of this method.

onUnbindMediaDetails

Added in 1.1.0

protected fun onUnbindMediaDetails(vh: AbstractMediaItemPresenter.ViewHolder!): Unit

Unbinds the media item details from their views provided by the AbstractMediaItemPresenter. This method can be overridden by the subclasses of this presenter if required.

Parameters
vh: AbstractMediaItemPresenter.ViewHolder!	ViewHolder to unbind from.