OnboardingSupportFragment

public abstract class OnboardingSupportFragment
extends Fragment

java.lang.Object
   ↳ androidx.fragment.app.Fragment
     ↳ androidx.leanback.app.OnboardingSupportFragment


An OnboardingSupportFragment provides a common and simple way to build onboarding screen for applications.

Building the screen

The view structure of onboarding screen is composed of the common parts and custom parts. The common parts are composed of icon, title, description and page navigator and the custom parts are composed of background, contents and foreground.

To build the screen views, the inherited class should override:

Each of these methods can return null if the application doesn't want to provide it.

Page information

The onboarding screen may have several pages which explain the functionality of the application. The inherited class should provide the page information by overriding the methods:

Note that the information is used in onCreateView(LayoutInflater, ViewGroup, Bundle), so should be initialized before calling super.onCreateView.

Animation

Onboarding screen has three kinds of animations:

Logo Splash Animation

When onboarding screen appears, the logo splash animation is played by default. The animation fades in the logo image, pauses in a few seconds and fades it out.

In most cases, the logo animation needs to be customized because the logo images of applications are different from each other, or some applications may want to show their own animations.

The logo animation can be customized in two ways:

If the inherited class provides neither the logo image nor the animation, the logo animation will be omitted.

Page enter animation

After logo animation finishes, page enter animation starts, which causes the header section - title and description views to fade and slide in. Users can override the default fade + slide animation by overriding onCreateTitleAnimator() & onCreateDescriptionAnimator(). By default we don't animate the custom views but users can provide animation by overriding onCreateEnterAnimation().

Page change animation

When the page changes, the default animations of the title and description are played. The inherited class can override onPageChanged(int, int) to start the custom animations.

Finishing the screen

If the user finishes the onboarding screen after navigating all the pages, onFinishFragment() is called. The inherited class can override this method to show another fragment or activity, or just remove this fragment.

Theming

OnboardingSupportFragment must have access to an appropriate theme. Specifically, the fragment must receive R.style.Theme_Leanback_Onboarding, or a theme whose parent 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 Onboarding 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 R.styleable.LeanbackOnboardingTheme_onboardingTheme. If present, this theme will be used by OnboardingSupportFragment as an overlay to the Activity's theme.
  • Finally, custom subclasses of OnboardingSupportFragment 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 onboarding theme do not need to set the onboardingTheme attribute; if set, it will be ignored.) R.attr.onboardingTheme R.attr.onboardingHeaderStyle R.attr.onboardingTitleStyle R.attr.onboardingDescriptionStyle R.attr.onboardingNavigatorContainerStyle R.attr.onboardingPageIndicatorStyle R.attr.onboardingStartButtonStyle R.attr.onboardingLogoStyle

Summary

Public constructors

OnboardingSupportFragment()

Public methods

final int getArrowBackgroundColor()

Returns the background color of the arrow if it's set through setArrowBackgroundColor(int).

final int getArrowColor()

Returns the color of the arrow if it's set through setArrowColor(int).

final int getDescriptionViewTextColor()

Returns the text color of DescriptionView if it's set through setDescriptionViewTextColor(int).

final int getDotBackgroundColor()

Returns the background color of the dot if it's set through setDotBackgroundColor(int).

final int getIconResourceId()

Returns the resource id of the main icon.

final int getLogoResourceId()

Returns the resource ID of the splash logo image.

final CharSequence getStartButtonText()

Returns the start button text if it's set through setStartButtonText(CharSequence)}.

final int getTitleViewTextColor()

Returns the text color of TitleView if it's set through setTitleViewTextColor(int).

View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)

Called to have the fragment instantiate its user interface view.

int onProvideTheme()

Returns the theme used for styling the fragment.

void onSaveInstanceState(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.

void onViewCreated(View view, Bundle savedInstanceState)

Called immediately after onCreateView(LayoutInflater, ViewGroup, Bundle) has returned, but before any saved state has been restored in to the view.

void setArrowBackgroundColor(int color)

Sets the background color of the arrow.

void setArrowColor(int color)

Sets the color of the arrow.

void setDescriptionViewTextColor(int color)

Sets the text color for DescriptionView.

void setDotBackgroundColor(int color)

Sets the background color of the dots.

final void setIconResouceId(int resourceId)

Sets the resource id for the main icon.

final void setLogoResourceId(int id)

Sets the resource ID of the splash logo image.

void setStartButtonText(CharSequence text)

Sets the text on the start button text.

void setTitleViewTextColor(int color)

Sets the text color for TitleView.

Protected methods

final int getCurrentPageIndex()

Returns the index of the current page.

abstract int getPageCount()

Returns the page count.

abstract CharSequence getPageDescription(int pageIndex)

Returns the description of the given page.

abstract CharSequence getPageTitle(int pageIndex)

Returns the title of the given page.

final boolean isLogoAnimationFinished()

Returns whether the logo enter animation is finished.

void moveToNextPage()

Navigates to the next page.

void moveToPreviousPage()

Navigates to the previous page.

abstract View onCreateBackgroundView(LayoutInflater inflater, ViewGroup container)

Called to have the inherited class create background view.

abstract View onCreateContentView(LayoutInflater inflater, ViewGroup container)

Called to have the inherited class create content view.

Animator onCreateDescriptionAnimator()

Provides the entry animation for description view.

Animator onCreateEnterAnimation()

Called to have the inherited class create its enter animation.

abstract View onCreateForegroundView(LayoutInflater inflater, ViewGroup container)

Called to have the inherited class create foreground view.

Animator onCreateLogoAnimation()

Called to have the inherited class create its own logo animation.

Animator onCreateTitleAnimator()

Provides the entry animation for title view.

void onFinishFragment()

Called when the onboarding flow finishes.

void onLogoAnimationFinished()

Called immediately after the logo animation is complete or no logo animation is specified.

void onPageChanged(int newPage, int previousPage)

Called when the page has been changed.

final void startEnterAnimation(boolean force)

Called to start entrance transition.

Inherited methods