GuidedStepSupportFragment
public class GuidedStepSupportFragment extends Fragment
A GuidedStepSupportFragment 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 GuidedStepSupportFragment 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 useronCreateActions, to provide a set ofGuidedActions the user can takeonGuidedActionClicked, to respond to those actions
Clients use following helper functions to add GuidedStepSupportFragment to Activity or FragmentManager:
addAsRoot, to be called during Activity onCreate, adds GuidedStepSupportFragment as the first Fragment in activity.addoradd, to add GuidedStepSupportFragment on top of existing Fragments or replacing existing GuidedStepSupportFragment when moving forward to next step.finishGuidedStepSupportFragmentscan either finish the activity or pop all GuidedStepSupportFragment from stack.- If app chooses not to use the helper function, it is the app's responsibility to call
setUiStyleto select fragment transition and remember the stack entry where it need pops to.
Theming and Stylists
GuidedStepSupportFragment delegates its visual styling to classes called stylists. The GuidanceStylist is responsible for the left guidance view, while the GuidedActionsStylist 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.
GuidedStepSupportFragments must have access to an appropriate theme in order for the stylists to function properly. Specifically, the fragment must receive 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
LeanbackGuidedStepTheme_guidedStepTheme. If present, this theme will be used by GuidedStepSupportFragment as an overlay to the Activity's theme. - Finally, custom subclasses of GuidedStepSupportFragment may provide a theme through the
onProvideThememethod. 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 GuidedStepSupportFragment through the onCreateGuidanceStylist and onCreateActionsStylist 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
GuidedStepSupportFragments can be grouped together to provide a guided sequence. GuidedStepSupportFragments 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 GuidedStepSupportFragments grouped in this way must all be defined programmatically, rather than in XML. This restriction may be removed in the future.guidedStepThemeguidedStepBackgroundguidedActionContentWidthWeightguidedActionContentWidthWeightTwoPanelsguidedActionsBackgroundguidedActionsBackgroundDarkguidedActionsElevation
Summary
Constants |
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static final String |
EXTRA_UI_STYLE = "uiStyle"Fragment argument name for UI style. |
static final int |
One possible value of argument |
static final int |
UI_STYLE_DEFAULT = 0This field is deprecated. Same value as |
static final int |
Default value for argument |
static final int |
UI_STYLE_REPLACE = 0This is the case that we use GuidedStepSupportFragment to replace another existing GuidedStepSupportFragment when moving forward to next step. |
Public constructors |
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Public methods |
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static int |
add(Adds the specified GuidedStepSupportFragment to the fragment stack, replacing any existing GuidedStepSupportFragments in the stack, and configuring the fragment-to-fragment custom transitions. |
static int |
add(Adds the specified GuidedStepSupportFragment to the fragment stack, replacing any existing GuidedStepSupportFragments in the stack, and configuring the fragment-to-fragment custom transitions. |
static int |
addAsRoot(Adds the specified GuidedStepSupportFragment as content of Activity; no backstack entry is added so the activity will be dismissed when BACK key is pressed. |
void |
collapseAction(boolean withTransition)Collapse action which either has a sub actions list or action with |
void |
Collapse sub actions list. |
void |
expandAction(@NonNull GuidedAction action, boolean withTransition)Expand a given action with sub actions list or |
void |
expandSubActions(@NonNull GuidedAction action)Expand a given action's sub actions list. |
@Nullable GuidedAction |
findActionById(long id)Find GuidedAction by Id. |
int |
findActionPositionById(long id)Find GuidedAction position in array by Id. |
@Nullable GuidedAction |
findButtonActionById(long id)Find button GuidedAction by Id. |
int |
findButtonActionPositionById(long id)Find button GuidedAction position in array by Id. |
void |
Convenient method to close GuidedStepSupportFragments on top of other content or finish Activity if GuidedStepSupportFragments were started in a separate activity. |
@Nullable View |
getActionItemView(int position)Returns the view corresponding to the action at the indicated position in the list of actions for this fragment. |
@NonNull List<GuidedAction> |
Returns the list of GuidedActions that the user may take in this fragment. |
@Nullable View |
getButtonActionItemView(int position)Returns the view corresponding to the button action at the indicated position in the list of actions for this fragment. |
@NonNull List<GuidedAction> |
Returns the list of button GuidedActions that the user may take in this fragment. |
static @Nullable GuidedStepSupportFragment |
Returns the current GuidedStepSupportFragment on the fragment transaction stack. |
@NonNull GuidanceStylist |
Returns the GuidanceStylist that displays guidance information for the user. |
@NonNull GuidedActionsStylist |
Returns the GuidedActionsStylist that displays the actions the user may take. |
@NonNull GuidedActionsStylist |
Returns the GuidedActionsStylist that displays the button actions the user may take. |
int |
Returns the position if the currently selected GuidedAction. |
int |
Returns the position if the currently selected button GuidedAction. |
int |
Read UI style from fragment arguments. |
boolean |
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boolean |
Returns true if allows focus out of end edge of GuidedStepSupportFragment, false otherwise. |
boolean |
Returns true if allows focus out of start edge of GuidedStepSupportFragment, false otherwise. |
boolean |
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void |
notifyActionChanged(int position)Notify an action has changed and update its UI. |
void |
notifyButtonActionChanged(int position)Notify an button action has changed and update its UI. |
void |
Called to do initial creation of a fragment. |
void |
onCreateActions(Fills out the set of actions available to the user. |
@NonNull GuidedActionsStylist |
Creates the presenter used to style the guided actions panel. |
@Nullable View |
onCreateBackgroundView(Called by onCreateView to inflate background view. |
void |
onCreateButtonActions(Fills out the set of actions shown at right available to the user. |
@NonNull GuidedActionsStylist |
Creates the presenter used to style a sided actions panel for button only. |
@NonNull GuidanceStylist.Guidance |
onCreateGuidance(@Nullable Bundle savedInstanceState)Returns the information required to provide guidance to the user. |
@NonNull GuidanceStylist |
Creates the presenter used to style the guidance panel. |
@Nullable View |
onCreateView(Called to have the fragment instantiate its user interface view. |
void |
Called when the view previously created by #onCreateView has been detached from the fragment. |
void |
onGuidedActionClicked(@NonNull GuidedAction action)Callback invoked when an action is taken by the user. |
void |
Callback invoked when an action has been canceled editing, for example when user closes IME window by BACK key. |
void |
This method is deprecated. Override |
long |
Callback invoked when an action has been edited, for example when user clicks confirm button in IME window. |
void |
onGuidedActionFocused(@NonNull GuidedAction action)Callback invoked when an action is focused (made to be the current selection) by the user. |
int |
Returns the theme used for styling the fragment. |
void |
onResume()Called when the fragment is visible to the user and actively running. |
void |
onSaveInstanceState(@NonNull Bundle outState)Called to ask the fragment to save its current dynamic state, so it can later be reconstructed in a new instance if its process is restarted. |
boolean |
onSubGuidedActionClicked(@NonNull GuidedAction action)Callback invoked when an action in sub actions is taken by the user. |
void |
openInEditMode(@Nullable GuidedAction action)Opens the provided action in edit mode and raises ime. |
void |
popBackStackToGuidedStepSupportFragment(Convenient method to pop to fragment with Given class. |
void |
setActions(@NonNull List<GuidedAction> actions)Sets the list of GuidedActions that the user may take in this fragment. |
void |
setActionsDiffCallback(Sets the RecyclerView DiffCallback used when |
void |
setButtonActions(@NonNull List<GuidedAction> actions)Sets the list of button GuidedActions that the user may take in this fragment. |
void |
setSelectedActionPosition(int position)Scrolls the action list to the position indicated, selecting that action's view. |
void |
setSelectedButtonActionPosition(int position)Scrolls the action list to the position indicated, selecting that button action's view. |
void |
setUiStyle(int style)Set UI style to fragment arguments. |
Protected methods |
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void |
onAddSharedElementTransition(Called when this fragment is added to FragmentTransaction with |
void |
Called by Constructor to provide fragment transitions. |
Inherited methods |
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Constants
EXTRA_UI_STYLE
public static final String EXTRA_UI_STYLE = "uiStyle"
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:
addAsRootsets toUI_STYLE_ACTIVITY_ROOTaddoraddsets it toUI_STYLE_REPLACEif there is already a GuidedStepSupportFragment on stack.finishGuidedStepSupportFragmentschanges current GuidedStepSupportFragment toUI_STYLE_ENTRANCEfor the non activity case. This is a special case that changes the transition settings after fragment has been created, in order to force current GuidedStepSupportFragment run a return transition ofUI_STYLE_ENTRANCE
Argument value can be either:
UI_STYLE_ACTIVITY_ROOT
public static final int UI_STYLE_ACTIVITY_ROOT = 2
One possible value of argument EXTRA_UI_STYLE. This is the case that we show first GuidedStepSupportFragment 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().
UI_STYLE_ENTRANCE
public static final int UI_STYLE_ENTRANCE = 1
Default value for argument EXTRA_UI_STYLE. The default value is assigned in GuidedStepSupportFragment constructor. This is the case that we show GuidedStepSupportFragment 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().
finishGuidedStepSupportFragments also changes the top GuidedStepSupportFragment to UI_STYLE_ENTRANCE in order to run the return transition (reverse of enter transition) of UI_STYLE_ENTRANCE.UI_STYLE_REPLACE
public static final int UI_STYLE_REPLACE = 0
This is the case that we use GuidedStepSupportFragment to replace another existing GuidedStepSupportFragment 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.
Public constructors
Public methods
add
public static int add(
@NonNull FragmentManager fragmentManager,
@NonNull GuidedStepSupportFragment fragment
)
Adds the specified GuidedStepSupportFragment to the fragment stack, replacing any existing GuidedStepSupportFragments 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 GuidedStepSupportFragment: assign
UI_STYLE_REPLACE - If current fragment on stack is not GuidedStepSupportFragment: assign
UI_STYLE_ENTRANCE
Note: currently fragments added using this method must be created programmatically rather than via XML.
| Parameters | |
|---|---|
@NonNull FragmentManager fragmentManager |
The FragmentManager to be used in the transaction. |
@NonNull GuidedStepSupportFragment fragment |
The GuidedStepSupportFragment to be inserted into the fragment stack. |
| Returns | |
|---|---|
int |
The ID returned by the call FragmentTransaction.commit. |
add
public static int add(
@NonNull FragmentManager fragmentManager,
@NonNull GuidedStepSupportFragment fragment,
int id
)
Adds the specified GuidedStepSupportFragment to the fragment stack, replacing any existing GuidedStepSupportFragments 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 GuidedStepSupportFragment: assign
UI_STYLE_REPLACEandonAddSharedElementTransitionwill be called to perform shared element transition between GuidedStepSupportFragments. - If current fragment on stack is not GuidedStepSupportFragment: assign
UI_STYLE_ENTRANCE
Note: currently fragments added using this method must be created programmatically rather than via XML.
| Parameters | |
|---|---|
@NonNull FragmentManager fragmentManager |
The FragmentManager to be used in the transaction. |
@NonNull GuidedStepSupportFragment fragment |
The GuidedStepSupportFragment to be inserted into the fragment stack. |
int id |
The id of container to add GuidedStepSupportFragment, can be android.R.id.content. |
| Returns | |
|---|---|
int |
The ID returned by the call FragmentTransaction.commit. |
addAsRoot
public static int addAsRoot(
@NonNull FragmentActivity activity,
@NonNull GuidedStepSupportFragment fragment,
int id
)
Adds the specified GuidedStepSupportFragment 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 | |
|---|---|
@NonNull FragmentActivity activity |
The Activity to be used to insert GuidedstepFragment. |
@NonNull GuidedStepSupportFragment fragment |
The GuidedStepSupportFragment to be inserted into the fragment stack. |
int id |
The id of container to add GuidedStepSupportFragment, can be android.R.id.content. |
| Returns | |
|---|---|
int |
The ID returned by the call FragmentTransaction.commit, or -1 there is already GuidedStepSupportFragment. |
collapseAction
public void collapseAction(boolean withTransition)
Collapse action which either has a sub actions list or action with hasEditableActivatorView is true.
| Parameters | |
|---|---|
boolean withTransition |
True to run transition animation, false otherwise. |
collapseSubActions
public void collapseSubActions()
Collapse sub actions list.
| See also | |
|---|---|
getSubActions |
expandAction
public void expandAction(@NonNull GuidedAction action, boolean withTransition)
Expand a given action with sub actions list or hasEditableActivatorView is true. The method must be called after onCreateView creates fragment view.
| Parameters | |
|---|---|
@NonNull GuidedAction action |
GuidedAction to expand. |
boolean withTransition |
True to run transition animation, false otherwise. |
expandSubActions
public void expandSubActions(@NonNull GuidedAction action)
Expand a given action's sub actions list.
| Parameters | |
|---|---|
@NonNull GuidedAction action |
GuidedAction to expand. |
| See also | |
|---|---|
expandAction |
findActionById
public @Nullable GuidedAction findActionById(long id)
Find GuidedAction by Id.
| Parameters | |
|---|---|
long id |
Id of the action to search. |
| Returns | |
|---|---|
@Nullable GuidedAction |
GuidedAction object or null if not found. |
findActionPositionById
public int findActionPositionById(long id)
Find GuidedAction position in array by Id.
| Parameters | |
|---|---|
long id |
Id of the action to search. |
| Returns | |
|---|---|
int |
position of GuidedAction object in array or -1 if not found. |
findButtonActionById
public @Nullable GuidedAction findButtonActionById(long id)
Find button GuidedAction by Id.
| Parameters | |
|---|---|
long id |
Id of the button action to search. |
| Returns | |
|---|---|
@Nullable GuidedAction |
GuidedAction object or null if not found. |
findButtonActionPositionById
public int findButtonActionPositionById(long id)
Find button GuidedAction position in array by Id.
| Parameters | |
|---|---|
long id |
Id of the button action to search. |
| Returns | |
|---|---|
int |
position of GuidedAction object in array or -1 if not found. |
finishGuidedStepSupportFragments
public void finishGuidedStepSupportFragments()
Convenient method to close GuidedStepSupportFragments on top of other content or finish Activity if GuidedStepSupportFragments 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 which sets up the stack entry name for finding which fragment we need to pop back to.
getActionItemView
public @Nullable View getActionItemView(int position)
Returns the view corresponding to the action at the indicated position in the list of actions for this fragment.
| Parameters | |
|---|---|
int position |
The integer position of the action of interest. |
getActions
public @NonNull List<GuidedAction> getActions()
Returns the list of GuidedActions that the user may take in this fragment.
| Returns | |
|---|---|
@NonNull List<GuidedAction> |
The list of GuidedActions for this fragment. |
getButtonActionItemView
public @Nullable View getButtonActionItemView(int position)
Returns the view corresponding to the button action at the indicated position in the list of actions for this fragment.
| Parameters | |
|---|---|
int position |
The integer position of the button action of interest. |
getButtonActions
public @NonNull List<GuidedAction> getButtonActions()
Returns the list of button GuidedActions that the user may take in this fragment.
| Returns | |
|---|---|
@NonNull List<GuidedAction> |
The list of button GuidedActions for this fragment. |
getCurrentGuidedStepSupportFragment
public static @Nullable GuidedStepSupportFragment getCurrentGuidedStepSupportFragment(@NonNull FragmentManager fm)
Returns the current GuidedStepSupportFragment on the fragment transaction stack.
| Returns | |
|---|---|
@Nullable GuidedStepSupportFragment |
The current GuidedStepSupportFragment, if any, on the fragment transaction stack. |
getGuidanceStylist
public @NonNull GuidanceStylist getGuidanceStylist()
Returns the GuidanceStylist that displays guidance information for the user.
| Returns | |
|---|---|
@NonNull GuidanceStylist |
The GuidanceStylist for this fragment. |
getGuidedActionsStylist
public @NonNull GuidedActionsStylist getGuidedActionsStylist()
Returns the GuidedActionsStylist that displays the actions the user may take.
| Returns | |
|---|---|
@NonNull GuidedActionsStylist |
The GuidedActionsStylist for this fragment. |
getGuidedButtonActionsStylist
public @NonNull GuidedActionsStylist getGuidedButtonActionsStylist()
Returns the GuidedActionsStylist that displays the button actions the user may take.
| Returns | |
|---|---|
@NonNull GuidedActionsStylist |
The GuidedActionsStylist for this fragment. |
getSelectedActionPosition
public int getSelectedActionPosition()
Returns the position if the currently selected GuidedAction.
| Returns | |
|---|---|
int |
position The integer position of the currently selected action. |
getSelectedButtonActionPosition
public int getSelectedButtonActionPosition()
Returns the position if the currently selected button GuidedAction.
| Returns | |
|---|---|
int |
position The integer position of the currently selected button action. |
getUiStyle
public int getUiStyle()
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 GuidedStepSupportFragment on backstack.
| Returns | |
|---|---|
int |
|
| See also | |
|---|---|
onProvideFragmentTransitions |
isExpanded
public boolean isExpanded()
| Returns | |
|---|---|
boolean |
True if is current expanded including subactions list or action with |
isFocusOutEndAllowed
public boolean isFocusOutEndAllowed()
Returns true if allows focus out of end edge of GuidedStepSupportFragment, false otherwise. Default value is false, the reason is to disable FocusFinder to find focusable views beneath content of GuidedStepSupportFragment. Subclass may override.
| Returns | |
|---|---|
boolean |
True if allows focus out of end edge of GuidedStepSupportFragment. |
isFocusOutStartAllowed
public boolean isFocusOutStartAllowed()
Returns true if allows focus out of start edge of GuidedStepSupportFragment, false otherwise. Default value is false, the reason is to disable FocusFinder to find focusable views beneath content of GuidedStepSupportFragment. Subclass may override.
| Returns | |
|---|---|
boolean |
True if allows focus out of start edge of GuidedStepSupportFragment. |
isSubActionsExpanded
public boolean isSubActionsExpanded()
| Returns | |
|---|---|
boolean |
True if the sub actions list is expanded, false otherwise. |
notifyActionChanged
public void notifyActionChanged(int position)
Notify an action has changed and update its UI.
| Parameters | |
|---|---|
int position |
Position of the GuidedAction in array. |
notifyButtonActionChanged
public void notifyButtonActionChanged(int position)
Notify an button action has changed and update its UI.
| Parameters | |
|---|---|
int position |
Position of the button GuidedAction in array. |
onCreate
public void onCreate(@Nullable Bundle savedInstanceState)
Called to do initial creation of a fragment. This is called after #onAttach(Activity) and before #onCreateView(LayoutInflater, ViewGroup, Bundle).
Note that this can be called while the fragment's activity is still in the process of being created. As such, you can not rely on things like the activity's content view hierarchy being initialized at this point. If you want to do work once the activity itself is created, add a on the activity's Lifecycle, removing it when it receives the Lifecycle.State#CREATED callback.
Any restored child fragments will be created before the base Fragment.onCreate method returns.
onCreateActions
public void onCreateActions(
@NonNull List<GuidedAction> actions,
@Nullable Bundle savedInstanceState
)
Fills out the set of actions available to the user. This hook is called during onCreate. The default leaves the list of actions empty; subclasses should override.
| Parameters | |
|---|---|
@NonNull List<GuidedAction> actions |
A non-null, empty list ready to be populated. |
@Nullable Bundle savedInstanceState |
The saved instance state from onCreate. |
onCreateActionsStylist
public @NonNull GuidedActionsStylist onCreateActionsStylist()
Creates the presenter used to style the guided actions panel. The default implementation returns a basic GuidedActionsStylist.
| Returns | |
|---|---|
@NonNull GuidedActionsStylist |
The GuidedActionsStylist used in this fragment. |
onCreateBackgroundView
public @Nullable View onCreateBackgroundView(
@NonNull LayoutInflater inflater,
@Nullable ViewGroup container,
@Nullable Bundle savedInstanceState
)
Called by onCreateView to inflate background view. Default implementation loads view from lb_guidedstep_background which holds a reference to guidedStepBackground.
onCreateButtonActions
public void onCreateButtonActions(
@NonNull List<GuidedAction> actions,
@Nullable Bundle savedInstanceState
)
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 | |
|---|---|
@NonNull List<GuidedAction> actions |
A non-null, empty list ready to be populated. |
@Nullable Bundle savedInstanceState |
The saved instance state from onCreate. |
onCreateButtonActionsStylist
public @NonNull GuidedActionsStylist onCreateButtonActionsStylist()
Creates the presenter used to style a sided actions panel for button only. The default implementation returns a basic GuidedActionsStylist.
| Returns | |
|---|---|
@NonNull GuidedActionsStylist |
The GuidedActionsStylist used in this fragment. |
onCreateGuidance
public @NonNull GuidanceStylist.Guidance onCreateGuidance(@Nullable Bundle savedInstanceState)
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 GuidanceStylist.Guidance for use in a subclass of GuidanceStylist. The default returns a Guidance object with empty fields; subclasses should override.
| Returns | |
|---|---|
@NonNull GuidanceStylist.Guidance |
The Guidance object representing the information used to guide the user. |
onCreateGuidanceStylist
public @NonNull GuidanceStylist onCreateGuidanceStylist()
Creates the presenter used to style the guidance panel. The default implementation returns a basic GuidanceStylist.
| Returns | |
|---|---|
@NonNull GuidanceStylist |
The GuidanceStylist used in this fragment. |
onCreateView
public @Nullable View onCreateView(
@NonNull LayoutInflater inflater,
@Nullable ViewGroup container,
@Nullable Bundle savedInstanceState
)
Called to have the fragment instantiate its user interface view. This is optional, and non-graphical fragments can return null. This will be called between #onCreate(Bundle) and #onViewCreated(View, Bundle).
A default View can be returned by calling #Fragment(int) in your constructor. Otherwise, this method returns null.
It is recommended to only inflate the layout in this method and move logic that operates on the returned View to #onViewCreated(View, Bundle).
If you return a View from here, you will later be called in #onDestroyView when the view is being released.
onDestroyView
public void onDestroyView()
Called when the view previously created by #onCreateView has been detached from the fragment. The next time the fragment needs to be displayed, a new view will be created. This is called after #onStop() and before #onDestroy(). It is called regardless of whether #onCreateView returned a non-null view. Internally it is called after the view's state has been saved but before it has been removed from its parent.
onGuidedActionClicked
public void onGuidedActionClicked(@NonNull GuidedAction action)
Callback invoked when an action is taken by the user. Subclasses should override in order to act on the user's decisions.
| Parameters | |
|---|---|
@NonNull GuidedAction action |
The chosen action. |
onGuidedActionEditCanceled
public void onGuidedActionEditCanceled(@NonNull GuidedAction action)
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.
| Parameters | |
|---|---|
@NonNull GuidedAction action |
The action which has been canceled editing. |
public voidonGuidedActionEdited(GuidedAction action)
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
public long onGuidedActionEditedAndProceed(@NonNull GuidedAction action)
Callback invoked when an action has been edited, for example when user clicks confirm button in IME window. Default implementation calls deprecated method onGuidedActionEdited and returns ACTION_ID_NEXT.
| Parameters | |
|---|---|
@NonNull GuidedAction action |
The action that has been edited. |
| Returns | |
|---|---|
long |
ID of the action will be focused or |
onGuidedActionFocused
public void onGuidedActionFocused(@NonNull GuidedAction action)
Callback invoked when an action is focused (made to be the current selection) by the user.
onProvideTheme
public int onProvideTheme()
Returns the theme used for styling the fragment. The default returns -1, indicating that the host Activity's theme should be used.
| Returns | |
|---|---|
int |
The theme resource ID of the theme to use in this fragment, or -1 to use the host Activity's theme. |
onResume
public void onResume()
Called when the fragment is visible to the user and actively running. This is generally tied to Activity.onResume of the containing Activity's lifecycle.
onSaveInstanceState
public void onSaveInstanceState(@NonNull Bundle outState)
Called to ask the fragment to save its current dynamic state, so it can later be reconstructed in a new instance if its process is restarted. If a new instance of the fragment later needs to be created, the data you place in the Bundle here will be available in the Bundle given to #onCreate(Bundle), #onCreateView(LayoutInflater, ViewGroup, Bundle), and #onViewCreated(View, Bundle).
This corresponds to Activity#onSaveInstanceState(Bundle) Activity.onSaveInstanceState(Bundle) and most of the discussion there applies here as well. Note however: this method may be called at any time before #onDestroy(). There are many situations where a fragment may be mostly torn down (such as when placed on the back stack with no UI showing), but its state will not be saved until its owning activity actually needs to save its state.
onSubGuidedActionClicked
public boolean onSubGuidedActionClicked(@NonNull GuidedAction action)
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 | |
|---|---|
@NonNull GuidedAction action |
The chosen action. |
| Returns | |
|---|---|
boolean |
true to collapse the sub actions list, false to keep it expanded. |
openInEditMode
public void openInEditMode(@Nullable GuidedAction action)
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.
popBackStackToGuidedStepSupportFragment
public void popBackStackToGuidedStepSupportFragment(
@NonNull Class<Object> guidedStepFragmentClass,
int flags
)
Convenient method to pop to fragment with Given class.
| Parameters | |
|---|---|
@NonNull Class<Object> guidedStepFragmentClass |
Name of the Class of GuidedStepSupportFragment to pop to. |
int flags |
Either 0 or |
setActions
public void setActions(@NonNull List<GuidedAction> actions)
Sets the list of GuidedActions that the user may take in this fragment. Uses DiffCallback set by setActionsDiffCallback.
| Parameters | |
|---|---|
@NonNull List<GuidedAction> actions |
The list of GuidedActions for this fragment. |
setActionsDiffCallback
public void setActionsDiffCallback(
@Nullable DiffCallback<GuidedAction> diffCallback
)
Sets the RecyclerView DiffCallback used when setActions is called. By default GuidedStepSupportFragment uses androidx.leanback.widget.GuidedActionDiffCallback. Sets it to null if app wants to refresh the whole list.
| Parameters | |
|---|---|
@Nullable DiffCallback<GuidedAction> diffCallback |
DiffCallback used in |
setButtonActions
public void setButtonActions(@NonNull List<GuidedAction> actions)
Sets the list of button GuidedActions that the user may take in this fragment.
| Parameters | |
|---|---|
@NonNull List<GuidedAction> actions |
The list of button GuidedActions for this fragment. |
setSelectedActionPosition
public void setSelectedActionPosition(int position)
Scrolls the action list to the position indicated, selecting that action's view.
| Parameters | |
|---|---|
int position |
The integer position of the action of interest. |
setSelectedButtonActionPosition
public void setSelectedButtonActionPosition(int position)
Scrolls the action list to the position indicated, selecting that button action's view.
| Parameters | |
|---|---|
int position |
The integer position of the button action of interest. |
setUiStyle
public void setUiStyle(int style)
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 GuidedStepSupportFragment on backstack. In most cases app does not directly call this method, app calls helper function add. 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 | |
|---|---|
int style |
|
Protected methods
onAddSharedElementTransition
protected void onAddSharedElementTransition(
@NonNull FragmentTransaction ft,
@NonNull GuidedStepSupportFragment disappearing
)
Called when this fragment is added to FragmentTransaction with UI_STYLE_REPLACE (aka when the GuidedStepSupportFragment replacing an existing GuidedStepSupportFragment). Default implementation establishes connections between action background views to morph action background bounds change from disappearing GuidedStepSupportFragment into this GuidedStepSupportFragment. The default implementation heavily relies on GuidedActionsStylist's layout, app may override this method when modifying the default layout of GuidedActionsStylist.
| Parameters | |
|---|---|
@NonNull FragmentTransaction ft |
The FragmentTransaction to add shared element. |
@NonNull GuidedStepSupportFragment disappearing |
The disappearing fragment. |
onProvideFragmentTransitions
protected void onProvideFragmentTransitions()
Called by Constructor to provide fragment transitions. The default implementation assigns transitions based on getUiStyle:
UI_STYLE_REPLACESlide 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_ENTRANCEEnter transition is set to slide from both sides, exit transition is same asUI_STYLE_REPLACE, no shared element enter transition.UI_STYLE_ACTIVITY_ROOTEnter transition is set to null and app should rely on activity transition, exit transition is same asUI_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).