GuidedStepFragment

Kotlin |Java

open class GuidedStepFragment : Fragment, FocusListener

kotlin.Any
↳	android.app.Fragment
	↳	androidx.leanback.app.GuidedStepFragment

A GuidedStepFragment is used to guide the user through a decision or series of decisions. It is composed of a guidance view on the left and a view on the right containing a list of possible actions.

Basic Usage

Clients of GuidedStepFragment must create a custom subclass to attach to their Activities. This custom subclass provides the information necessary to construct the user interface and respond to user actions. At a minimum, subclasses should override:

• onCreateGuidance, to provide instructions to the user
• onCreateActions, to provide a set of GuidedActions the user can take
• onGuidedActionClicked, to respond to those actions

Clients use following helper functions to add GuidedStepFragment to Activity or FragmentManager:

• addAsRoot(Activity, GuidedStepFragment, int), to be called during Activity onCreate, adds GuidedStepFragment as the first Fragment in activity.
• add(FragmentManager, GuidedStepFragment) or add(FragmentManager, * GuidedStepFragment, int), to add GuidedStepFragment on top of existing Fragments or replacing existing GuidedStepFragment when moving forward to next step.
• finishGuidedStepFragments() can either finish the activity or pop all GuidedStepFragment from stack.
• If app chooses not to use the helper function, it is the app's responsibility to call setUiStyle(int) to select fragment transition and remember the stack entry where it need pops to.

Theming and Stylists

GuidedStepFragment delegates its visual styling to classes called stylists. The is responsible for the left guidance view, while the is responsible for the right actions view. The stylists use theme attributes to derive values associated with the presentation, such as colors, animations, etc. Most simple visual aspects of GuidanceStylist and GuidedActionsStylist can be customized via theming; see their documentation for more information.

GuidedStepFragments must have access to an appropriate theme in order for the stylists to function properly. Specifically, the fragment must receive androidx.leanback.R.style#Theme_Leanback_GuidedStep, or a theme whose parent is is set to that theme. Themes can be provided in one of three ways:

• The simplest way is to set the theme for the host Activity to the GuidedStep theme or a theme that derives from it.
• If the Activity already has a theme and setting its parent theme is inconvenient, the existing Activity theme can have an entry added for the attribute androidx.leanback.R.styleable#LeanbackGuidedStepTheme_guidedStepTheme. If present, this theme will be used by GuidedStepFragment as an overlay to the Activity's theme.
• Finally, custom subclasses of GuidedStepFragment may provide a theme through the method. This can be useful if a subclass is used across multiple Activities.

If the theme is provided in multiple ways, the onProvideTheme override has priority, followed by the Activity's theme. (Themes whose parent theme is already set to the guided step theme do not need to set the guidedStepTheme attribute; if set, it will be ignored.)

If themes do not provide enough customizability, the stylists themselves may be subclassed and provided to the GuidedStepFragment through the onCreateGuidanceStylist and methods. The stylists have simple hooks so that subclasses may override layout files; subclasses may also have more complex logic to determine styling.

Guided sequences

GuidedStepFragments can be grouped together to provide a guided sequence. GuidedStepFragments grouped as a sequence use custom animations provided by GuidanceStylist and GuidedActionsStylist (or subclasses) during transitions between steps. Clients should use add to place subsequent GuidedFragments onto the fragment stack so that custom animations are properly configured. (Custom animations are triggered automatically when the fragment stack is subsequently popped by any normal mechanism.)

Note: Currently GuidedStepFragments grouped in this way must all be defined programmatically, rather than in XML. This restriction may be removed in the future. androidx.leanback.R.attr#guidedStepTheme androidx.leanback.R.attr#guidedStepBackground androidx.leanback.R.attr#guidedActionContentWidthWeight androidx.leanback.R.attr#guidedActionContentWidthWeightTwoPanels androidx.leanback.R.attr#guidedActionsBackground androidx.leanback.R.attr#guidedActionsBackgroundDark androidx.leanback.R.attr#guidedActionsElevation

Summary

Constants
static String	EXTRA_UI_STYLE Fragment argument name for UI style.
static Int	UI_STYLE_ACTIVITY_ROOT One possible value of argument EXTRA_UI_STYLE.
static Int	UI_STYLE_DEFAULT
static Int	UI_STYLE_ENTRANCE Default value for argument EXTRA_UI_STYLE.
static Int	UI_STYLE_REPLACE This is the case that we use GuidedStepFragment to replace another existing GuidedStepFragment when moving forward to next step.

Public constructors
<init>()

Public methods
open static Int	add(fragmentManager: FragmentManager!, fragment: GuidedStepFragment!) Adds the specified GuidedStepFragment to the fragment stack, replacing any existing GuidedStepFragments in the stack, and configuring the fragment-to-fragment custom transitions.
open static Int	add(fragmentManager: FragmentManager!, fragment: GuidedStepFragment!, id: Int) Adds the specified GuidedStepFragment to the fragment stack, replacing any existing GuidedStepFragments in the stack, and configuring the fragment-to-fragment custom transitions.
open static Int	addAsRoot(activity: Activity!, fragment: GuidedStepFragment!, id: Int) Adds the specified GuidedStepFragment as content of Activity; no backstack entry is added so the activity will be dismissed when BACK key is pressed.
open Unit	collapseAction(withTransition: Boolean) Collapse action which either has a sub actions list or action with GuidedAction#hasEditableActivatorView() is true.
open Unit	collapseSubActions() Collapse sub actions list.
open Unit	expandAction(action: GuidedAction!, withTransition: Boolean) Expand a given action with sub actions list or GuidedAction#hasEditableActivatorView() is true.
open Unit	expandSubActions(action: GuidedAction!) Expand a given action's sub actions list.
open GuidedAction!	findActionById(id: Long) Find GuidedAction by Id.
open Int	findActionPositionById(id: Long) Find GuidedAction position in array by Id.
open GuidedAction!	findButtonActionById(id: Long) Find button GuidedAction by Id.
open Int	findButtonActionPositionById(id: Long) Find button GuidedAction position in array by Id.
open Unit	finishGuidedStepFragments() Convenient method to close GuidedStepFragments on top of other content or finish Activity if GuidedStepFragments were started in a separate activity.
open View!	getActionItemView(position: Int) Returns the view corresponding to the action at the indicated position in the list of actions for this fragment.
open MutableList<GuidedAction!>!	getActions() Returns the list of GuidedActions that the user may take in this fragment.
open View!	getButtonActionItemView(position: Int) Returns the view corresponding to the button action at the indicated position in the list of actions for this fragment.
open MutableList<GuidedAction!>!	getButtonActions() Returns the list of button GuidedActions that the user may take in this fragment.
open static GuidedStepFragment!	getCurrentGuidedStepFragment(fm: FragmentManager!) Returns the current GuidedStepFragment on the fragment transaction stack.
open GuidanceStylist!	getGuidanceStylist() Returns the GuidanceStylist that displays guidance information for the user.
open GuidedActionsStylist!	getGuidedActionsStylist() Returns the GuidedActionsStylist that displays the actions the user may take.
open GuidedActionsStylist!	getGuidedButtonActionsStylist() Returns the GuidedActionsStylist that displays the button actions the user may take.
open Int	getSelectedActionPosition() Returns the position if the currently selected GuidedAction.
open Int	getSelectedButtonActionPosition() Returns the position if the currently selected button GuidedAction.
open Int	getUiStyle() Read UI style from fragment arguments.
open Boolean	isExpanded()
open Boolean	isFocusOutEndAllowed() Returns true if allows focus out of end edge of GuidedStepFragment, false otherwise.
open Boolean	isFocusOutStartAllowed() Returns true if allows focus out of start edge of GuidedStepFragment, false otherwise.
open Boolean	isSubActionsExpanded()
open Unit	notifyActionChanged(position: Int) Notify an action has changed and update its UI.
open Unit	notifyButtonActionChanged(position: Int) Notify an button action has changed and update its UI.
open Unit	onCreate(savedInstanceState: Bundle!)
open Unit	onCreateActions(@NonNull actions: MutableList<GuidedAction!>, savedInstanceState: Bundle!) Fills out the set of actions available to the user.
open GuidedActionsStylist!	onCreateActionsStylist() Creates the presenter used to style the guided actions panel.
open View!	onCreateBackgroundView(inflater: LayoutInflater!, container: ViewGroup!, savedInstanceState: Bundle!) Called by onCreateView to inflate background view.
open Unit	onCreateButtonActions(@NonNull actions: MutableList<GuidedAction!>, savedInstanceState: Bundle!) Fills out the set of actions shown at right available to the user.
open GuidedActionsStylist!	onCreateButtonActionsStylist() Creates the presenter used to style a sided actions panel for button only.
open GuidanceStylist.Guidance	onCreateGuidance(savedInstanceState: Bundle!) Returns the information required to provide guidance to the user.
open GuidanceStylist!	onCreateGuidanceStylist() Creates the presenter used to style the guidance panel.
open View!	onCreateView(inflater: LayoutInflater!, container: ViewGroup!, savedInstanceState: Bundle!)
open Unit	onDestroyView()
open Unit	onGuidedActionClicked(action: GuidedAction!) Callback invoked when an action is taken by the user.
open Unit	onGuidedActionEditCanceled(action: GuidedAction!) Callback invoked when an action has been canceled editing, for example when user closes IME window by BACK key.
open Unit	onGuidedActionEdited(action: GuidedAction!) Callback invoked when an action's title or description has been edited, this happens either when user clicks confirm button in IME or user closes IME window by BACK key.
open Long	onGuidedActionEditedAndProceed(action: GuidedAction!) Callback invoked when an action has been edited, for example when user clicks confirm button in IME window.
open Unit	onGuidedActionFocused(action: GuidedAction!) Callback invoked when an action is focused (made to be the current selection) by the user.
open Int	onProvideTheme() Returns the theme used for styling the fragment.
open Unit	onResume()
open Unit	onSaveInstanceState(outState: Bundle!)
open Boolean	onSubGuidedActionClicked(action: GuidedAction!) Callback invoked when an action in sub actions is taken by the user.
open Unit	openInEditMode(action: GuidedAction!) Opens the provided action in edit mode and raises ime.
open Unit	popBackStackToGuidedStepFragment(guidedStepFragmentClass: Class<Any!>!, flags: Int) Convenient method to pop to fragment with Given class.
open Unit	setActions(actions: MutableList<GuidedAction!>!) Sets the list of GuidedActions that the user may take in this fragment.
open Unit	setActionsDiffCallback(diffCallback: DiffCallback<GuidedAction!>!) Sets the RecyclerView DiffCallback used when setActions(List) is called.
open Unit	setButtonActions(actions: MutableList<GuidedAction!>!) Sets the list of button GuidedActions that the user may take in this fragment.
open Unit	setSelectedActionPosition(position: Int) Scrolls the action list to the position indicated, selecting that action's view.
open Unit	setSelectedButtonActionPosition(position: Int) Scrolls the action list to the position indicated, selecting that button action's view.
open Unit	setUiStyle(style: Int) Set UI style to fragment arguments.

Protected methods
open Unit	onAddSharedElementTransition(ft: FragmentTransaction!, disappearing: GuidedStepFragment!) Called when this fragment is added to FragmentTransaction with UI_STYLE_REPLACE (aka when the GuidedStepFragment replacing an existing GuidedStepFragment).
open Unit	onProvideFragmentTransitions() Called by Constructor to provide fragment transitions.

Constants

EXTRA_UI_STYLE

static val EXTRA_UI_STYLE: String

Fragment argument name for UI style. The argument value is persisted in fragment state and used to select fragment transition. The value is initially UI_STYLE_ENTRANCE and might be changed in one of the three helper functions:

• addAsRoot(Activity, GuidedStepFragment, int) sets to UI_STYLE_ACTIVITY_ROOT
• add(FragmentManager, GuidedStepFragment) or add(FragmentManager, * GuidedStepFragment, int) sets it to UI_STYLE_REPLACE if there is already a GuidedStepFragment on stack.
• finishGuidedStepFragments() changes current GuidedStepFragment to UI_STYLE_ENTRANCE for the non activity case. This is a special case that changes the transition settings after fragment has been created, in order to force current GuidedStepFragment run a return transition of UI_STYLE_ENTRANCE

Argument value can be either:

• UI_STYLE_REPLACE
• UI_STYLE_ENTRANCE
• UI_STYLE_ACTIVITY_ROOT

Value: "uiStyle"

UI_STYLE_ACTIVITY_ROOT

static val UI_STYLE_ACTIVITY_ROOT: Int

One possible value of argument EXTRA_UI_STYLE. This is the case that we show first GuidedStepFragment in a separate activity. The default behavior of this style:

• Enter transition is assigned null (will rely on activity transition), exit transition is same as UI_STYLE_ENTRANCE. Note: Changing exit transition by UI style is not working because fragment transition asks for exit transition before UI style is restored in Fragment.onCreate().

Value: 2

UI_STYLE_DEFAULT

static val UI_STYLE_DEFAULT: Int

Deprecated: Same value as UI_STYLE_REPLACE.

Value: 0

UI_STYLE_ENTRANCE

static val UI_STYLE_ENTRANCE: Int

Default value for argument EXTRA_UI_STYLE. The default value is assigned in GuidedStepFragment constructor. This is the case that we show GuidedStepFragment on top of other content. The default behavior of this style:

• Enter transition slides in from two sides, exit transition slide out to START(left). Background will be faded in. Note: Changing exit transition by UI style is not working because fragment transition asks for exit transition before UI style is restored in Fragment .onCreate().

When popping multiple GuidedStepFragment, finishGuidedStepFragments() also changes the top GuidedStepFragment to UI_STYLE_ENTRANCE in order to run the return transition (reverse of enter transition) of UI_STYLE_ENTRANCE.

Value: 1

UI_STYLE_REPLACE

static val UI_STYLE_REPLACE: Int

This is the case that we use GuidedStepFragment to replace another existing GuidedStepFragment when moving forward to next step. Default behavior of this style is:

• Enter transition slides in from END(right), exit transition same as UI_STYLE_ENTRANCE.

Value: 0

Public constructors

<init>

GuidedStepFragment()

Public methods

add

open static fun add(fragmentManager: FragmentManager!, fragment: GuidedStepFragment!): Int

Adds the specified GuidedStepFragment to the fragment stack, replacing any existing GuidedStepFragments in the stack, and configuring the fragment-to-fragment custom transitions. A backstack entry is added, so the fragment will be dismissed when BACK key is pressed.

If current fragment on stack is GuidedStepFragment: assign UI_STYLE_REPLACE

If current fragment on stack is not GuidedStepFragment: assign UI_STYLE_ENTRANCE

Note: currently fragments added using this method must be created programmatically rather than via XML.

Parameters
fragmentManager	FragmentManager!: The FragmentManager to be used in the transaction.
fragment	FragmentManager!: The GuidedStepFragment to be inserted into the fragment stack.

Return
Int: The ID returned by the call FragmentTransaction.commit.

add

open static fun add(fragmentManager: FragmentManager!, fragment: GuidedStepFragment!, id: Int): Int

Adds the specified GuidedStepFragment to the fragment stack, replacing any existing GuidedStepFragments in the stack, and configuring the fragment-to-fragment custom transitions. A backstack entry is added, so the fragment will be dismissed when BACK key is pressed.

If current fragment on stack is GuidedStepFragment: assign UI_STYLE_REPLACE and onAddSharedElementTransition(FragmentTransaction, GuidedStepFragment) will be called to perform shared element transition between GuidedStepFragments.

If current fragment on stack is not GuidedStepFragment: assign UI_STYLE_ENTRANCE

Note: currently fragments added using this method must be created programmatically rather than via XML.

Parameters
fragmentManager	FragmentManager!: The FragmentManager to be used in the transaction.
fragment	FragmentManager!: The GuidedStepFragment to be inserted into the fragment stack.
id	FragmentManager!: The id of container to add GuidedStepFragment, can be android.R.id.content.

Return
Int: The ID returned by the call FragmentTransaction.commit.

addAsRoot

open static fun addAsRoot(activity: Activity!, fragment: GuidedStepFragment!, id: Int): Int

Adds the specified GuidedStepFragment as content of Activity; no backstack entry is added so the activity will be dismissed when BACK key is pressed. The method is typically called in Activity.onCreate() when savedInstanceState is null. When savedInstanceState is not null, the Activity is being restored, do not call addAsRoot() to duplicate the Fragment restored by FragmentManager. UI_STYLE_ACTIVITY_ROOT is assigned. Note: currently fragments added using this method must be created programmatically rather than via XML.

Parameters
activity	Activity!: The Activity to be used to insert GuidedstepFragment.
fragment	Activity!: The GuidedStepFragment to be inserted into the fragment stack.
id	Activity!: The id of container to add GuidedStepFragment, can be android.R.id.content.

Return
Int: The ID returned by the call FragmentTransaction.commit, or -1 there is already GuidedStepFragment.

collapseAction

open fun collapseAction(withTransition: Boolean): Unit

Collapse action which either has a sub actions list or action with GuidedAction#hasEditableActivatorView() is true.

Parameters
withTransition	Boolean: True to run transition animation, false otherwise.

collapseSubActions

open fun collapseSubActions(): Unit

Collapse sub actions list.

See Also

• GuidedAction#getSubActions()

expandAction

open fun expandAction(action: GuidedAction!, withTransition: Boolean): Unit

Expand a given action with sub actions list or GuidedAction#hasEditableActivatorView() is true. The method must be called after onCreateView(LayoutInflater, ViewGroup, Bundle) creates fragment view.

Parameters
action	GuidedAction!: GuidedAction to expand.
withTransition	GuidedAction!: True to run transition animation, false otherwise.

expandSubActions

open fun expandSubActions(action: GuidedAction!): Unit

Expand a given action's sub actions list.

Parameters
action	GuidedAction!: GuidedAction to expand.

See Also

• #expandAction(GuidedAction, boolean)

findActionById

open fun findActionById(id: Long): GuidedAction!

Find GuidedAction by Id.

Parameters
id	Long: Id of the action to search.

Return
GuidedAction!: GuidedAction object or null if not found.

findActionPositionById

open fun findActionPositionById(id: Long): Int

Find GuidedAction position in array by Id.

Parameters
id	Long: Id of the action to search.

Return
Int: position of GuidedAction object in array or -1 if not found.

findButtonActionById

open fun findButtonActionById(id: Long): GuidedAction!

Find button GuidedAction by Id.

Parameters
id	Long: Id of the button action to search.

Return
GuidedAction!: GuidedAction object or null if not found.

findButtonActionPositionById

open fun findButtonActionPositionById(id: Long): Int

Find button GuidedAction position in array by Id.

Parameters
id	Long: Id of the button action to search.

Return
Int: position of GuidedAction object in array or -1 if not found.

finishGuidedStepFragments

open fun finishGuidedStepFragments(): Unit

Convenient method to close GuidedStepFragments on top of other content or finish Activity if GuidedStepFragments were started in a separate activity. Pops all stack entries including UI_STYLE_ENTRANCE; if UI_STYLE_ENTRANCE is not found, finish the activity. Note that this method must be paired with add(FragmentManager, GuidedStepFragment, * int) which sets up the stack entry name for finding which fragment we need to pop back to.

getActionItemView

open fun getActionItemView(position: Int): View!

Returns the view corresponding to the action at the indicated position in the list of actions for this fragment.

Parameters
position	Int: The integer position of the action of interest.

Return
View!: The View corresponding to the action at the indicated position, or null if that action is not currently onscreen.

getActions

open fun getActions(): MutableList<GuidedAction!>!

Returns the list of GuidedActions that the user may take in this fragment.

Return
MutableList<GuidedAction!>!: The list of GuidedActions for this fragment.

getButtonActionItemView

open fun getButtonActionItemView(position: Int): View!

Returns the view corresponding to the button action at the indicated position in the list of actions for this fragment.

Parameters
position	Int: The integer position of the button action of interest.

Return
View!: The View corresponding to the button action at the indicated position, or null if that action is not currently onscreen.

getButtonActions

open fun getButtonActions(): MutableList<GuidedAction!>!

Returns the list of button GuidedActions that the user may take in this fragment.

Return
MutableList<GuidedAction!>!: The list of button GuidedActions for this fragment.

getCurrentGuidedStepFragment

open static fun getCurrentGuidedStepFragment(fm: FragmentManager!): GuidedStepFragment!

Returns the current GuidedStepFragment on the fragment transaction stack.

Return
GuidedStepFragment!: The current GuidedStepFragment, if any, on the fragment transaction stack.

getGuidanceStylist

open fun getGuidanceStylist(): GuidanceStylist!

Returns the GuidanceStylist that displays guidance information for the user.

Return
GuidanceStylist!: The GuidanceStylist for this fragment.

getGuidedActionsStylist

open fun getGuidedActionsStylist(): GuidedActionsStylist!

Returns the GuidedActionsStylist that displays the actions the user may take.

Return
GuidedActionsStylist!: The GuidedActionsStylist for this fragment.

getGuidedButtonActionsStylist

open fun getGuidedButtonActionsStylist(): GuidedActionsStylist!

Returns the GuidedActionsStylist that displays the button actions the user may take.

Return
GuidedActionsStylist!: The GuidedActionsStylist for this fragment.

getSelectedActionPosition

open fun getSelectedActionPosition(): Int

Returns the position if the currently selected GuidedAction.

Return
Int: position The integer position of the currently selected action.

getSelectedButtonActionPosition

open fun getSelectedButtonActionPosition(): Int

Returns the position if the currently selected button GuidedAction.

Return
Int: position The integer position of the currently selected button action.

getUiStyle

open fun getUiStyle(): Int

Read UI style from fragment arguments. Default value is UI_STYLE_ENTRANCE when fragment is first initialized. UI style is used to choose different fragment transition animations and determine if this is the first GuidedStepFragment on backstack.

Return
Int: UI_STYLE_ACTIVITY_ROOT UI_STYLE_REPLACE or UI_STYLE_ENTRANCE.

See Also

• #onProvideFragmentTransitions()

isExpanded

open fun isExpanded(): Boolean

Return
Boolean: True if is current expanded including subactions list or action with GuidedAction#hasEditableActivatorView() is true.

isFocusOutEndAllowed

open fun isFocusOutEndAllowed(): Boolean

Returns true if allows focus out of end edge of GuidedStepFragment, false otherwise. Default value is false, the reason is to disable FocusFinder to find focusable views beneath content of GuidedStepFragment. Subclass may override.

Return
Boolean: True if allows focus out of end edge of GuidedStepFragment.

isFocusOutStartAllowed

open fun isFocusOutStartAllowed(): Boolean

Returns true if allows focus out of start edge of GuidedStepFragment, false otherwise. Default value is false, the reason is to disable FocusFinder to find focusable views beneath content of GuidedStepFragment. Subclass may override.

Return
Boolean: True if allows focus out of start edge of GuidedStepFragment.

isSubActionsExpanded

open fun isSubActionsExpanded(): Boolean

Return
Boolean: True if the sub actions list is expanded, false otherwise.

notifyActionChanged

open fun notifyActionChanged(position: Int): Unit

Notify an action has changed and update its UI.

Parameters
position	Int: Position of the GuidedAction in array.

notifyButtonActionChanged

open fun notifyButtonActionChanged(position: Int): Unit

Notify an button action has changed and update its UI.

Parameters
position	Int: Position of the button GuidedAction in array.

onCreate

open fun onCreate(savedInstanceState: Bundle!): Unit

onCreateActions

open fun onCreateActions(@NonNull actions: MutableList<GuidedAction!>, savedInstanceState: Bundle!): Unit

Fills out the set of actions available to the user. This hook is called during . The default leaves the list of actions empty; subclasses should override.

Parameters
actions	MutableList<GuidedAction!>: A non-null, empty list ready to be populated.
savedInstanceState	MutableList<GuidedAction!>: The saved instance state from onCreate.

onCreateActionsStylist

open fun onCreateActionsStylist(): GuidedActionsStylist!

Creates the presenter used to style the guided actions panel. The default implementation returns a basic GuidedActionsStylist.

Return
GuidedActionsStylist!: The GuidedActionsStylist used in this fragment.

onCreateBackgroundView

open fun onCreateBackgroundView(inflater: LayoutInflater!, container: ViewGroup!, savedInstanceState: Bundle!): View!

Called by onCreateView to inflate background view. Default implementation loads view from R.layout#lb_guidedstep_background which holds a reference to guidedStepBackground.

Parameters
inflater	LayoutInflater!: LayoutInflater to load background view.
container	LayoutInflater!: Parent view of background view.
savedInstanceState	LayoutInflater!:

Return
View!: Created background view or null if no background.

onCreateButtonActions

open fun onCreateButtonActions(@NonNull actions: MutableList<GuidedAction!>, savedInstanceState: Bundle!): Unit

Fills out the set of actions shown at right available to the user. This hook is called during onCreate. The default leaves the list of actions empty; subclasses may override.

Parameters
actions	MutableList<GuidedAction!>: A non-null, empty list ready to be populated.
savedInstanceState	MutableList<GuidedAction!>: The saved instance state from onCreate.

onCreateButtonActionsStylist

open fun onCreateButtonActionsStylist(): GuidedActionsStylist!

Creates the presenter used to style a sided actions panel for button only. The default implementation returns a basic GuidedActionsStylist.

Return
GuidedActionsStylist!: The GuidedActionsStylist used in this fragment.

onCreateGuidance

@NonNull open fun onCreateGuidance(savedInstanceState: Bundle!): GuidanceStylist.Guidance

Returns the information required to provide guidance to the user. This hook is called during onCreateView. May be overridden to return a custom subclass of for use in a subclass of GuidanceStylist. The default returns a Guidance object with empty fields; subclasses should override.

Parameters
savedInstanceState	Bundle!: The saved instance state from onCreateView.

Return
GuidanceStylist.Guidance: The Guidance object representing the information used to guide the user.

onCreateGuidanceStylist

open fun onCreateGuidanceStylist(): GuidanceStylist!

Creates the presenter used to style the guidance panel. The default implementation returns a basic GuidanceStylist.

Return
GuidanceStylist!: The GuidanceStylist used in this fragment.

onCreateView

open fun onCreateView(inflater: LayoutInflater!, container: ViewGroup!, savedInstanceState: Bundle!): View!

onDestroyView

open fun onDestroyView(): Unit

onGuidedActionClicked

open fun onGuidedActionClicked(action: GuidedAction!): Unit

Callback invoked when an action is taken by the user. Subclasses should override in order to act on the user's decisions.

Parameters
action	GuidedAction!: The chosen action.

onGuidedActionEditCanceled

open fun onGuidedActionEditCanceled(action: GuidedAction!): Unit

Callback invoked when an action has been canceled editing, for example when user closes IME window by BACK key. Default implementation calls deprecated method onGuidedActionEdited(GuidedAction).

Parameters
action	GuidedAction!: The action which has been canceled editing.

onGuidedActionEdited

open fun onGuidedActionEdited(action: GuidedAction!): Unit

Deprecated: Override onGuidedActionEditedAndProceed(GuidedAction) and/or onGuidedActionEditCanceled(GuidedAction).

Callback invoked when an action's title or description has been edited, this happens either when user clicks confirm button in IME or user closes IME window by BACK key.

onGuidedActionEditedAndProceed

open fun onGuidedActionEditedAndProceed(action: GuidedAction!): Long

Callback invoked when an action has been edited, for example when user clicks confirm button in IME window. Default implementation calls deprecated method onGuidedActionEdited(GuidedAction) and returns GuidedAction#ACTION_ID_NEXT.

Parameters
action	GuidedAction!: The action that has been edited.

Return
Long: ID of the action will be focused or GuidedAction#ACTION_ID_NEXT, GuidedAction#ACTION_ID_CURRENT.

onGuidedActionFocused

open fun onGuidedActionFocused(action: GuidedAction!): Unit

Callback invoked when an action is focused (made to be the current selection) by the user.

onProvideTheme

open fun onProvideTheme(): Int

Returns the theme used for styling the fragment. The default returns -1, indicating that the host Activity's theme should be used.

Return
Int: The theme resource ID of the theme to use in this fragment, or -1 to use the host Activity's theme.

onResume

open fun onResume(): Unit

onSaveInstanceState

open fun onSaveInstanceState(outState: Bundle!): Unit

onSubGuidedActionClicked

open fun onSubGuidedActionClicked(action: GuidedAction!): Boolean

Callback invoked when an action in sub actions is taken by the user. Subclasses should override in order to act on the user's decisions. Default return value is true to close the sub actions list.

Parameters
action	GuidedAction!: The chosen action.

Return
Boolean: true to collapse the sub actions list, false to keep it expanded.

openInEditMode

open fun openInEditMode(action: GuidedAction!): Unit

Opens the provided action in edit mode and raises ime. This can be used to programmatically skip the extra click required to go into edit mode. This method can be invoked in onCreateView(LayoutInflater, ViewGroup, Bundle).

popBackStackToGuidedStepFragment

open fun popBackStackToGuidedStepFragment(guidedStepFragmentClass: Class<Any!>!, flags: Int): Unit

Convenient method to pop to fragment with Given class.

Parameters
guidedStepFragmentClass	Class<Any!>!: Name of the Class of GuidedStepFragment to pop to.
flags	Class<Any!>!: Either 0 or FragmentManager#POP_BACK_STACK_INCLUSIVE.

setActions

open fun setActions(actions: MutableList<GuidedAction!>!): Unit

Sets the list of GuidedActions that the user may take in this fragment. Uses DiffCallback set by setActionsDiffCallback(DiffCallback).

Parameters
actions	MutableList<GuidedAction!>!: The list of GuidedActions for this fragment.

setActionsDiffCallback

open fun setActionsDiffCallback(diffCallback: DiffCallback<GuidedAction!>!): Unit

Sets the RecyclerView DiffCallback used when setActions(List) is called. By default GuidedStepFragment uses androidx.leanback.widget.GuidedActionDiffCallback. Sets it to null if app wants to refresh the whole list.

Parameters
diffCallback	DiffCallback<GuidedAction!>!: DiffCallback used in setActions(List).

setButtonActions

open fun setButtonActions(actions: MutableList<GuidedAction!>!): Unit

Sets the list of button GuidedActions that the user may take in this fragment.

Parameters
actions	MutableList<GuidedAction!>!: The list of button GuidedActions for this fragment.

setSelectedActionPosition

open fun setSelectedActionPosition(position: Int): Unit

Scrolls the action list to the position indicated, selecting that action's view.

Parameters
position	Int: The integer position of the action of interest.

setSelectedButtonActionPosition

open fun setSelectedButtonActionPosition(position: Int): Unit

Scrolls the action list to the position indicated, selecting that button action's view.

Parameters
position	Int: The integer position of the button action of interest.

setUiStyle

open fun setUiStyle(style: Int): Unit

Set UI style to fragment arguments. Default value is UI_STYLE_ENTRANCE when fragment is first initialized. UI style is used to choose different fragment transition animations and determine if this is the first GuidedStepFragment on backstack. In most cases app does not directly call this method, app calls helper function add(FragmentManager, GuidedStepFragment, int). However if the app creates Fragment transaction and controls backstack by itself, it would need call setUiStyle() to select the fragment transition to use.

Parameters
style	Int: UI_STYLE_ACTIVITY_ROOT UI_STYLE_REPLACE or UI_STYLE_ENTRANCE.

Protected methods

onAddSharedElementTransition

protected open fun onAddSharedElementTransition(ft: FragmentTransaction!, disappearing: GuidedStepFragment!): Unit

Called when this fragment is added to FragmentTransaction with UI_STYLE_REPLACE (aka when the GuidedStepFragment replacing an existing GuidedStepFragment). Default implementation establishes connections between action background views to morph action background bounds change from disappearing GuidedStepFragment into this GuidedStepFragment. The default implementation heavily relies on GuidedActionsStylist's layout, app may override this method when modifying the default layout of GuidedActionsStylist.

Parameters
ft	FragmentTransaction!: The FragmentTransaction to add shared element.
disappearing	FragmentTransaction!: The disappearing fragment.

See Also

• GuidedActionsStylist#onProvideFragmentTransitions()

onProvideFragmentTransitions

protected open fun onProvideFragmentTransitions(): Unit

Called by Constructor to provide fragment transitions. The default implementation assigns transitions based on getUiStyle():

• UI_STYLE_REPLACE Slide from/to end(right) for enter transition, slide from/to start(left) for exit transition, shared element enter transition is set to ChangeBounds.
• UI_STYLE_ENTRANCE Enter transition is set to slide from both sides, exit transition is same as UI_STYLE_REPLACE, no shared element enter transition.
• UI_STYLE_ACTIVITY_ROOT Enter transition is set to null and app should rely on activity transition, exit transition is same as UI_STYLE_REPLACE, no shared element enter transition.

The default implementation heavily relies on GuidedActionsStylist and GuidanceStylist layout, app may override this method when modifying the default layout of GuidedActionsStylist or GuidanceStylist.

TIP: because the fragment view is removed during fragment transition, in general app cannot use two Visibility transition together. Workaround is to create your own Visibility transition that controls multiple animators (e.g. slide and fade animation in one Transition class).