belongs to Maven artifact com.android.support:leanback-v17:28.0.0-alpha1
Deprecated since version 27.1.0
GuidedStepFragment
public
class
GuidedStepFragment
extends Fragment
java.lang.Object | ||
↳ | android.app.Fragment | |
↳ | android.support.v17.leanback.app.GuidedStepFragment |
This class was deprecated
in API level 27.1.0.
use GuidedStepSupportFragment
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(Bundle)
, to provide instructions to the useronCreateActions(List
, to provide a set of, Bundle) GuidedAction
s the user can takeonGuidedActionClicked(GuidedAction)
, 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)
oradd(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 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.
GuidedStepFragments 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 GuidedStepFragment as an overlay to the Activity's theme. - Finally, custom subclasses of GuidedStepFragment may provide a theme through the
onProvideTheme()
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 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
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(FragmentManager, GuidedStepFragment)
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.