# ChangeScroll

Artifact: [androidx.transition:transition](https://developer.android.com/jetpack/androidx/releases/transition) [View Source](https://cs.android.com/search?q=file:androidx/transition/ChangeScroll.java+class:androidx.transition.ChangeScroll) Added in [1.0.0](https://developer.android.com/jetpack/androidx/releases/transition#1.0.0)

*** ** * ** ***

<br />

```
class ChangeScroll : Transition
```

<br />

|---|---|---|
| [kotlin.Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html) |||
| ↳ | [androidx.transition.Transition](https://developer.android.com/reference/kotlin/androidx/transition/Transition) ||
|   | ↳ | [androidx.transition.ChangeScroll](https://developer.android.com/reference/kotlin/androidx/transition/ChangeScroll) |

*** ** * ** ***

This transition captures the scroll properties of targets before and after the scene change and animates any changes.

## Summary

| ### Public constructors |
|---|
| `https://developer.android.com/reference/kotlin/androidx/transition/ChangeScroll#ChangeScroll()()` |
| `https://developer.android.com/reference/kotlin/androidx/transition/ChangeScroll#ChangeScroll(android.content.Context,android.util.AttributeSet)(context: https://developer.android.com/reference/android/content/Context.html, attrs: https://developer.android.com/reference/android/util/AttributeSet.html)` |

| ### Public functions |
|---|---|
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/transition/ChangeScroll#captureEndValues(androidx.transition.TransitionValues)(transitionValues: https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues)` Captures the values in the end scene for the properties that this transition monitors. |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/transition/ChangeScroll#captureStartValues(androidx.transition.TransitionValues)(transitionValues: https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues)` Captures the values in the start scene for the properties that this transition monitors. |
| `https://developer.android.com/reference/android/animation/Animator.html?` | `https://developer.android.com/reference/kotlin/androidx/transition/ChangeScroll#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)( sceneRoot: https://developer.android.com/reference/android/view/ViewGroup.html, startValues: https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues?, endValues: https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues? )` This method creates an animation that will be run for this transition given the information in the startValues and endValues structures captured earlier for the start and end scenes. |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-array/index.html<https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html!>?` | `https://developer.android.com/reference/kotlin/androidx/transition/ChangeScroll#getTransitionProperties()()` Returns the set of property names used stored in the `https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues` object passed into `https://developer.android.com/reference/kotlin/androidx/transition/Transition#captureStartValues(androidx.transition.TransitionValues)` that this transition cares about for the purposes of canceling overlapping animations. |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` | `https://developer.android.com/reference/kotlin/androidx/transition/ChangeScroll#isSeekingSupported()()` Returns `true` if the Transition can be used by `https://developer.android.com/reference/kotlin/androidx/transition/TransitionManager#controlDelayedTransition(android.view.ViewGroup,androidx.transition.Transition)`. |

### Inherited Constants

From [androidx.transition.Transition](https://developer.android.com/reference/kotlin/androidx/transition/Transition) `const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#MATCH_ID() = 3`

With `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setMatchOrder(int...)`, chooses to match by `https://developer.android.com/reference/android/view/View.html#getId()`.
`const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#MATCH_INSTANCE() = 1`

With `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setMatchOrder(int...)`, chooses to match by View instance.
`const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#MATCH_ITEM_ID() = 4`

With `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setMatchOrder(int...)`, chooses to match by the `https://developer.android.com/reference/android/widget/Adapter.html` item id.
`const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#MATCH_NAME() = 2`

With `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setMatchOrder(int...)`, chooses to match by `https://developer.android.com/reference/android/view/View.html#getTransitionName()`.

### Inherited functions

From [androidx.transition.Transition](https://developer.android.com/reference/kotlin/androidx/transition/Transition) `https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#addListener(androidx.transition.Transition.TransitionListener)(listener: https://developer.android.com/reference/kotlin/androidx/transition/Transition.TransitionListener)`

Adds a listener to the set of listeners that are sent events through the life of an animation, such as start, repeat, and end.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#addTarget(int)(targetId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`

Adds the id of a target view that this Transition is interested in animating.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#addTarget(java.lang.String)(targetName: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)`

Adds the transitionName of a target view that this Transition is interested in animating.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#addTarget(java.lang.Class<?>)(targetType: https://developer.android.com/reference/java/lang/Class.html<*>)`

Adds the Class of a target view that this Transition is interested in animating.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#addTarget(android.view.View)(target: https://developer.android.com/reference/android/view/View.html)`

Sets the target view instances that this Transition is interested in animating.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#clone()()` `https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#excludeChildren(int,boolean)(targetId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, exclude: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`

Whether to add the children of the given id to the list of targets to exclude from this transition.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#excludeChildren(android.view.View,boolean)(target: https://developer.android.com/reference/android/view/View.html, exclude: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`

Whether to add the children of given target to the list of target children to exclude from this transition.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#excludeChildren(java.lang.Class<?>,boolean)(type: https://developer.android.com/reference/java/lang/Class.html<*>, exclude: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`

Whether to add the given type to the list of types whose children should be excluded from this transition.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#excludeTarget(int,boolean)(targetId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, exclude: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`

Whether to add the given id to the list of target ids to exclude from this transition.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#excludeTarget(java.lang.String,boolean)(targetName: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html, exclude: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`

Whether to add the given transitionName to the list of target transitionNames to exclude from this transition.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#excludeTarget(android.view.View,boolean)(target: https://developer.android.com/reference/android/view/View.html, exclude: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`

Whether to add the given target to the list of targets to exclude from this transition.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#excludeTarget(java.lang.Class<?>,boolean)(type: https://developer.android.com/reference/java/lang/Class.html<*>, exclude: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`

Whether to add the given type to the list of types to exclude from this transition.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getDuration()()`

Returns the duration set on this transition.
`https://developer.android.com/reference/android/graphics/Rect.html?` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getEpicenter()()`

Returns the epicenter as specified by the `https://developer.android.com/reference/android/transition/Transition.EpicenterCallback.html` or null if no callback exists.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition.EpicenterCallback?` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getEpicenterCallback()()`

Returns the callback used to find the epicenter of the Transition.
`https://developer.android.com/reference/android/animation/TimeInterpolator.html?` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getInterpolator()()`

Returns the interpolator set on this transition.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getName()()`

Returns the name of this Transition.
`https://developer.android.com/reference/kotlin/androidx/transition/PathMotion` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getPathMotion()()`

Returns the algorithm object used to interpolate along two dimensions.
`https://developer.android.com/reference/kotlin/androidx/transition/TransitionPropagation?` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getPropagation()()`

Returns the `https://developer.android.com/reference/android/transition/TransitionPropagation.html` used to calculate Animator start delays.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getRootTransition()()`

If this Transition is not part of a TransitionSet, this is returned.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getStartDelay()()`

Returns the startDelay set on this transition.
`(https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-mutable-list/index.html)https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-list/index.html<https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html!>` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getTargetIds()()`

Returns the array of target IDs that this transition limits itself to tracking and animating.
`(https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-mutable-list/index.html)https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-list/index.html<https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html!>?` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getTargetNames()()`

Returns the list of target transitionNames that this transition limits itself to tracking and animating.
`(https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-mutable-list/index.html)https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-list/index.html<https://developer.android.com/reference/java/lang/Class.html<*>!>?` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getTargetTypes()()`

Returns the list of target transitionNames that this transition limits itself to tracking and animating.
`(https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-mutable-list/index.html)https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-list/index.html<https://developer.android.com/reference/android/view/View.html!>` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getTargets()()`

Returns the array of target views that this transition limits itself to tracking and animating.
`https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues?` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getTransitionValues(android.view.View,boolean)(view: https://developer.android.com/reference/android/view/View.html, start: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)`

This method can be called by transitions to get the TransitionValues for any particular view during the transition-playing process.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#isTransitionRequired(androidx.transition.TransitionValues,androidx.transition.TransitionValues)(

startValues: https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues?,

endValues: https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues?

)`

Returns whether or not the transition should create an Animator, based on the values captured during `https://developer.android.com/reference/kotlin/androidx/transition/Transition#captureStartValues(androidx.transition.TransitionValues)` and `https://developer.android.com/reference/kotlin/androidx/transition/Transition#captureEndValues(androidx.transition.TransitionValues)`.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#removeListener(androidx.transition.Transition.TransitionListener)(listener: https://developer.android.com/reference/kotlin/androidx/transition/Transition.TransitionListener)`

Removes a listener from the set listening to this animation.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#removeTarget(java.lang.Class<?>)(target: https://developer.android.com/reference/java/lang/Class.html<*>)`

Removes the given target from the list of targets that this Transition is interested in animating.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#removeTarget(int)(targetId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)`

Removes the given targetId from the list of ids that this Transition is interested in animating.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#removeTarget(java.lang.String)(targetName: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)`

Removes the given targetName from the list of transitionNames that this Transition is interested in animating.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#removeTarget(android.view.View)(target: https://developer.android.com/reference/android/view/View.html)`

Removes the given target from the list of targets that this Transition is interested in animating.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setDuration(long)(duration: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html)`

Sets the duration of this transition.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setEpicenterCallback(androidx.transition.Transition.EpicenterCallback)(epicenterCallback: https://developer.android.com/reference/kotlin/androidx/transition/Transition.EpicenterCallback?)`

Sets the callback to use to find the epicenter of a Transition.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setInterpolator(android.animation.TimeInterpolator)(interpolator: https://developer.android.com/reference/android/animation/TimeInterpolator.html?)`

Sets the interpolator of this transition.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setMatchOrder(int...)(matches: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int-array/index.html<https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html>?)`

Sets the order in which Transition matches View start and end values.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setPathMotion(androidx.transition.PathMotion)(pathMotion: https://developer.android.com/reference/kotlin/androidx/transition/PathMotion?)`

Sets the algorithm used to calculate two-dimensional interpolation.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setPropagation(androidx.transition.TransitionPropagation)(transitionPropagation: https://developer.android.com/reference/kotlin/androidx/transition/TransitionPropagation?)`

Sets the method for determining Animator start delays.
`https://developer.android.com/reference/kotlin/androidx/transition/Transition` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#setStartDelay(long)(startDelay: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html)`

Sets the startDelay of this transition.
`https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html` `https://developer.android.com/reference/kotlin/androidx/transition/Transition#toString()()`

## Public constructors

### ChangeScroll

Added in [1.0.0](https://developer.android.com/jetpack/androidx/releases/transition#1.0.0)

```
ChangeScroll()
```

### ChangeScroll

Added in [1.0.0](https://developer.android.com/jetpack/androidx/releases/transition#1.0.0)

```
ChangeScroll(context: Context, attrs: AttributeSet)
```

## Public functions

### captureEndValues

```
fun captureEndValues(transitionValues: TransitionValues): Unit
```

Captures the values in the end scene for the properties that this transition monitors. These values are then passed as the endValues structure in a later call to `https://developer.android.com/reference/kotlin/androidx/transition/Transition#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)`. The main concern for an implementation is what the properties are that the transition cares about and what the values are for all of those properties. The start and end values will be compared later during the `https://developer.android.com/reference/kotlin/androidx/transition/Transition#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)` method to determine what, if any, animations, should be run.

Subclasses must implement this method. The method should only be called by the transition system; it is not intended to be called from external classes.

| Parameters |
|---|---|
| `transitionValues: https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues` | The holder for any values that the Transition wishes to store. Values are stored in the `values` field of this TransitionValues object and are keyed from a String value. For example, to store a view's rotation value, a transition might call `transitionValues.values.put("appname:transitionname:rotation", view.getRotation())`. The target view will already be stored in the transitionValues structure when this method is called. |

| See also |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/transition/Transition#captureStartValues(androidx.transition.TransitionValues)` |   |
| `https://developer.android.com/reference/kotlin/androidx/transition/Transition#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)` |   |

### captureStartValues

```
fun captureStartValues(transitionValues: TransitionValues): Unit
```

Captures the values in the start scene for the properties that this transition monitors. These values are then passed as the startValues structure in a later call to `https://developer.android.com/reference/kotlin/androidx/transition/Transition#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)`. The main concern for an implementation is what the properties are that the transition cares about and what the values are for all of those properties. The start and end values will be compared later during the `https://developer.android.com/reference/kotlin/androidx/transition/Transition#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)` method to determine what, if any, animations, should be run.

Subclasses must implement this method. The method should only be called by the transition system; it is not intended to be called from external classes.

| Parameters |
|---|---|
| `transitionValues: https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues` | The holder for any values that the Transition wishes to store. Values are stored in the `values` field of this TransitionValues object and are keyed from a String value. For example, to store a view's rotation value, a transition might call `transitionValues.values.put("appname:transitionname:rotation", view.getRotation())`. The target view will already be stored in the transitionValues structure when this method is called. |

| See also |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/transition/Transition#captureEndValues(androidx.transition.TransitionValues)` |   |
| `https://developer.android.com/reference/kotlin/androidx/transition/Transition#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)` |   |

### createAnimator

```
fun createAnimator(
    sceneRoot: ViewGroup,
    startValues: TransitionValues?,
    endValues: TransitionValues?
): Animator?
```

This method creates an animation that will be run for this transition given the information in the startValues and endValues structures captured earlier for the start and end scenes. Subclasses of Transition should override this method. The method should only be called by the transition system; it is not intended to be called from external classes.

This method is called by the transition's parent (all the way up to the topmost Transition in the hierarchy) with the sceneRoot and start/end values that the transition may need to set up initial target values and construct an appropriate animation. For example, if an overall Transition is a `https://developer.android.com/reference/kotlin/androidx/transition/TransitionSet` consisting of several child transitions in sequence, then some of the child transitions may want to set initial values on target views prior to the overall Transition commencing, to put them in an appropriate state for the delay between that start and the child Transition start time. For example, a transition that fades an item in may wish to set the starting alpha value to 0, to avoid it blinking in prior to the transition actually starting the animation. This is necessary because the scene change that triggers the Transition will automatically set the end-scene on all target views, so a Transition that wants to animate from a different value should set that value prior to returning from this method.

Additionally, a Transition can perform logic to determine whether the transition needs to run on the given target and start/end values. For example, a transition that resizes objects on the screen may wish to avoid running for views which are not present in either the start or end scenes.

If there is an animator created and returned from this method, the transition mechanism will apply any applicable duration, startDelay, and interpolator to that animation and start it. A return value of `null` indicates that no animation should run. The default implementation returns null.

The method is called for every applicable target object, which is stored in the `https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues#view()` field.

| Parameters |
|---|---|
| `sceneRoot: https://developer.android.com/reference/android/view/ViewGroup.html` | The root of the transition hierarchy. |
| `startValues: https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues?` | The values for a specific target in the start scene. |
| `endValues: https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues?` | The values for the target in the end scene. |

| Returns |
|---|---|
| `https://developer.android.com/reference/android/animation/Animator.html?` | A Animator to be started at the appropriate time in the overall transition for this scene change. A null value means no animation should be run. |

### getTransitionProperties

```
fun getTransitionProperties(): Array<String!>?
```

Returns the set of property names used stored in the `https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues` object passed into `https://developer.android.com/reference/kotlin/androidx/transition/Transition#captureStartValues(androidx.transition.TransitionValues)` that this transition cares about for the purposes of canceling overlapping animations. When any transition is started on a given scene root, all transitions currently running on that same scene root are checked to see whether the properties on which they based their animations agree with the end values of the same properties in the new transition. If the end values are not equal, then the old animation is canceled since the new transition will start a new animation to these new values. If the values are equal, the old animation is allowed to continue and no new animation is started for that transition.

A transition does not need to override this method. However, not doing so will mean that the cancellation logic outlined in the previous paragraph will be skipped for that transition, possibly leading to artifacts as old transitions and new transitions on the same targets run in parallel, animating views toward potentially different end values.

| Returns |
|---|---|
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-array/index.html<https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html!>?` | An array of property names as described in the class documentation for `https://developer.android.com/reference/kotlin/androidx/transition/TransitionValues`. The default implementation returns `null`. |

### isSeekingSupported

```
fun isSeekingSupported(): Boolean
```

Returns `true` if the Transition can be used by `https://developer.android.com/reference/kotlin/androidx/transition/TransitionManager#controlDelayedTransition(android.view.ViewGroup,androidx.transition.Transition)`. This means that any the state must be ready before any `https://developer.android.com/reference/android/animation/Animator.html` returned by `https://developer.android.com/reference/kotlin/androidx/transition/Transition#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)` has started and if the Animator has ended, it must be able to restore the state when starting in reverse. If a Transition must know when the entire transition has ended, a `https://developer.android.com/reference/kotlin/androidx/transition/Transition.TransitionListener` can be added to `https://developer.android.com/reference/kotlin/androidx/transition/Transition#getRootTransition()` and it can listen for `https://developer.android.com/reference/kotlin/androidx/transition/Transition.TransitionListener#onTransitionEnd(androidx.transition.Transition)`.