Save the date! Android Dev Summit is coming to Sunnyvale, CA on Oct 23-24, 2019.

Fade

open class Fade : Visibility
kotlin.Any
   ↳ androidx.transition.Transition
   ↳ androidx.transition.Visibility
   ↳ androidx.transition.Fade

This transition tracks changes to the visibility of target views in the start and end scenes and fades views in or out when they become visible or non-visible. Visibility is determined by both the View#setVisibility(int) state of the view as well as whether it is parented in the current view hierarchy.

The ability of this transition to fade out a particular view, and the way that that fading operation takes place, is based on the situation of the view in the view hierarchy. For example, if a view was simply removed from its parent, then the view will be added into a while fading. If a visible view is changed to be View#GONE or View#INVISIBLE, then the visibility will be changed to View#VISIBLE for the duration of the animation. However, if a view is in a hierarchy which is also altering its visibility, the situation can be more complicated. In general, if a view that is no longer in the hierarchy in the end scene still has a parent (so its parent hierarchy was removed, but it was not removed from its parent), then it will be left alone to avoid side-effects from improperly removing it from its parent. The only exception to this is if the previous Scene was created from a layout resource file, then it is considered safe to un-parent the starting scene view in order to fade it out.

A Fade transition can be described in a resource file by using the tag fade, along with the standard attributes of Fade and Transition.

Summary

Constants
static Int

Fading mode used in Fade(int) to make the transition operate on targets that are appearing.

static Int

Fading mode used in Fade(int) to make the transition operate on targets that are disappearing.

Inherited constants
Public constructors
<init>(fadingMode: Int)

Constructs a Fade transition that will fade targets in and/or out, according to the value of fadingMode.

Constructs a Fade transition that will fade targets in and out.

<init>(context: Context!, attrs: AttributeSet!)

Public methods
open Unit
captureStartValues(@NonNull transitionValues: TransitionValues)

open Animator!
onAppear(sceneRoot: ViewGroup!, view: View!, startValues: TransitionValues!, endValues: TransitionValues!)

open Animator!
onDisappear(sceneRoot: ViewGroup!, view: View!, startValues: TransitionValues!, endValues: TransitionValues!)

Inherited functions

Constants

IN

static val IN: Int

Fading mode used in Fade(int) to make the transition operate on targets that are appearing. Maybe be combined with OUT to fade both in and out.

Value: Visibility.MODE_IN

OUT

static val OUT: Int

Fading mode used in Fade(int) to make the transition operate on targets that are disappearing. Maybe be combined with IN to fade both in and out.

Value: Visibility.MODE_OUT

Public constructors

<init>

Fade(fadingMode: Int)

Constructs a Fade transition that will fade targets in and/or out, according to the value of fadingMode.

Parameters
fadingMode Int: The behavior of this transition, a combination of IN and OUT.

<init>

Fade()

Constructs a Fade transition that will fade targets in and out.

<init>

Fade(context: Context!, attrs: AttributeSet!)

Public methods

captureStartValues

open fun captureStartValues(@NonNull transitionValues: TransitionValues): Unit

onAppear

open fun onAppear(sceneRoot: ViewGroup!, view: View!, startValues: TransitionValues!, endValues: TransitionValues!): Animator!

onDisappear

open fun onDisappear(sceneRoot: ViewGroup!, view: View!, startValues: TransitionValues!, endValues: TransitionValues!): Animator!