# TransitionSet

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

*** ** * ** ***

<br />

```
public class TransitionSet extends Transition
```

<br />

|---|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object.html) |||
| ↳ | [androidx.transition.Transition](https://developer.android.com/reference/androidx/transition/Transition) ||
|   | ↳ | [androidx.transition.TransitionSet](https://developer.android.com/reference/androidx/transition/TransitionSet) |

Known direct subclasses [AutoTransition](https://developer.android.com/reference/androidx/transition/AutoTransition)

|---|---|
| `https://developer.android.com/reference/androidx/transition/AutoTransition` | Utility class for creating a default transition that automatically fades, moves, and resizes views during a scene change. |

*** ** * ** ***

A TransitionSet is a parent of child transitions (including other TransitionSets). Using TransitionSets enables more complex choreography of transitions, where some sets play `https://developer.android.com/reference/androidx/transition/TransitionSet#ORDERING_TOGETHER()` and others play `https://developer.android.com/reference/androidx/transition/TransitionSet#ORDERING_SEQUENTIAL()`. For example, `https://developer.android.com/reference/androidx/transition/AutoTransition` uses a TransitionSet to sequentially play a Fade(Fade.OUT), followed by a `https://developer.android.com/reference/androidx/transition/ChangeBounds`, followed by a Fade(Fade.OUT) transition.

A TransitionSet can be described in a resource file by using the tag `transitionSet`, along with the standard attributes of `TransitionSet` and `https://developer.android.com/reference/androidx/transition/Transition`. Child transitions of the TransitionSet object can be loaded by adding those child tags inside the enclosing `transitionSet` tag. For example, the following xml describes a TransitionSet that plays a Fade and then a ChangeBounds transition on the affected view targets:

```
    <transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
            android:transitionOrdering="sequential">
        <fade/>
        <changeBounds/>
    </transitionSet>
```

## Summary

| ### Constants |
|---|---|
| `static final int` | `https://developer.android.com/reference/androidx/transition/TransitionSet#ORDERING_SEQUENTIAL() = 1` A flag used to indicate that the child transitions of this set should play in sequence; when one child transition ends, the next child transition begins. |
| `static final int` | `https://developer.android.com/reference/androidx/transition/TransitionSet#ORDERING_TOGETHER() = 0` A flag used to indicate that the child transitions of this set should all start at the same time. |

| ### Public constructors |
|---|
| `https://developer.android.com/reference/androidx/transition/TransitionSet#TransitionSet()()` Constructs an empty transition set. |
| `https://developer.android.com/reference/androidx/transition/TransitionSet#TransitionSet(android.content.Context,android.util.AttributeSet)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/content/Context.html context, @https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/util/AttributeSet.html attrs)` |

| ### Public methods |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#addListener(androidx.transition.Transition.TransitionListener)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition.TransitionListener listener)` 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://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#addTarget(int)(@https://developer.android.com/reference/androidx/annotation/IdRes int targetId)` Adds the id of a target view that this Transition is interested in animating. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#addTarget(java.lang.String)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/String.html targetName)` Adds the transitionName of a target view that this Transition is interested in animating. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#addTarget(java.lang.Class<?>)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/Class.html<@https://developer.android.com/reference/androidx/annotation/NonNull ?> targetType)` Adds the Class of a target view that this Transition is interested in animating. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#addTarget(android.view.View)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/view/View.html target)` Sets the target view instances that this Transition is interested in animating. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#addTransition(androidx.transition.Transition)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition transition)` Adds child transition to this set. |
| `void` | `https://developer.android.com/reference/androidx/transition/TransitionSet#captureEndValues(androidx.transition.TransitionValues)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionValues transitionValues)` Captures the values in the end scene for the properties that this transition monitors. |
| `void` | `https://developer.android.com/reference/androidx/transition/TransitionSet#captureStartValues(androidx.transition.TransitionValues)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionValues transitionValues)` Captures the values in the start scene for the properties that this transition monitors. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` | `https://developer.android.com/reference/androidx/transition/TransitionSet#clone()()` |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` | `https://developer.android.com/reference/androidx/transition/TransitionSet#excludeTarget(int,boolean)(int targetId, boolean exclude)` Whether to add the given id to the list of target ids to exclude from this transition. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` | `https://developer.android.com/reference/androidx/transition/TransitionSet#excludeTarget(java.lang.String,boolean)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/String.html targetName, boolean exclude)` Whether to add the given transitionName to the list of target transitionNames to exclude from this transition. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` | `https://developer.android.com/reference/androidx/transition/TransitionSet#excludeTarget(android.view.View,boolean)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/view/View.html target, boolean exclude)` Whether to add the given target to the list of targets to exclude from this transition. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` | `https://developer.android.com/reference/androidx/transition/TransitionSet#excludeTarget(java.lang.Class<?>,boolean)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/Class.html<@https://developer.android.com/reference/androidx/annotation/NonNull ?> type, boolean exclude)` Whether to add the given type to the list of types to exclude from this transition. |
| `int` | `https://developer.android.com/reference/androidx/transition/TransitionSet#getOrdering()()` Returns the ordering of this TransitionSet. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/Transition` | `https://developer.android.com/reference/androidx/transition/TransitionSet#getTransitionAt(int)(int index)` Returns the child Transition at the specified position in the TransitionSet. |
| `int` | `https://developer.android.com/reference/androidx/transition/TransitionSet#getTransitionCount()()` Returns the number of child transitions in the TransitionSet. |
| `boolean` | `https://developer.android.com/reference/androidx/transition/TransitionSet#isSeekingSupported()()` Returns `true` if the Transition can be used by `https://developer.android.com/reference/androidx/transition/TransitionManager#controlDelayedTransition(android.view.ViewGroup,androidx.transition.Transition)`. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#removeListener(androidx.transition.Transition.TransitionListener)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition.TransitionListener listener)` Removes a listener from the set listening to this animation. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#removeTarget(java.lang.Class<?>)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/Class.html<@https://developer.android.com/reference/androidx/annotation/NonNull ?> target)` Removes the given target from the list of targets that this Transition is interested in animating. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#removeTarget(int)(@https://developer.android.com/reference/androidx/annotation/IdRes int targetId)` Removes the given targetId from the list of ids that this Transition is interested in animating. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#removeTarget(java.lang.String)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/String.html targetName)` Removes the given targetName from the list of transitionNames that this Transition is interested in animating. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#removeTarget(android.view.View)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/view/View.html target)` Removes the given target from the list of targets that this Transition is interested in animating. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#removeTransition(androidx.transition.Transition)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition transition)` Removes the specified child transition from this set. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#setDuration(long)(long duration)` Setting a non-negative duration on a TransitionSet causes all of the child transitions (current and future) to inherit this duration. |
| `void` | `https://developer.android.com/reference/androidx/transition/TransitionSet#setEpicenterCallback(androidx.transition.Transition.EpicenterCallback)( @https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/Transition.EpicenterCallback epicenterCallback )` Sets the callback to use to find the epicenter of a Transition. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#setInterpolator(android.animation.TimeInterpolator)(@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/android/animation/TimeInterpolator.html interpolator)` Sets the interpolator of this transition. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#setOrdering(int)(int ordering)` Sets the play order of this set's child transitions. |
| `void` | `https://developer.android.com/reference/androidx/transition/TransitionSet#setPathMotion(androidx.transition.PathMotion)(@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/PathMotion pathMotion)` Sets the algorithm used to calculate two-dimensional interpolation. |
| `void` | `https://developer.android.com/reference/androidx/transition/TransitionSet#setPropagation(androidx.transition.TransitionPropagation)(@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/TransitionPropagation transitionPropagation)` Sets the method for determining Animator start delays. |
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | `https://developer.android.com/reference/androidx/transition/TransitionSet#setStartDelay(long)(long startDelay)` Sets the startDelay of this transition. |

### Inherited Constants

From [androidx.transition.Transition](https://developer.android.com/reference/androidx/transition/Transition) `static final int` `https://developer.android.com/reference/androidx/transition/Transition#MATCH_ID() = 3`

With `https://developer.android.com/reference/androidx/transition/Transition#setMatchOrder(int...)`, chooses to match by `https://developer.android.com/reference/android/view/View.html#getId()`.
`static final int` `https://developer.android.com/reference/androidx/transition/Transition#MATCH_INSTANCE() = 1`

With `https://developer.android.com/reference/androidx/transition/Transition#setMatchOrder(int...)`, chooses to match by View instance.
`static final int` `https://developer.android.com/reference/androidx/transition/Transition#MATCH_ITEM_ID() = 4`

With `https://developer.android.com/reference/androidx/transition/Transition#setMatchOrder(int...)`, chooses to match by the `https://developer.android.com/reference/android/widget/Adapter.html` item id.
`static final int` `https://developer.android.com/reference/androidx/transition/Transition#MATCH_NAME() = 2`

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

### Inherited methods

From [androidx.transition.Transition](https://developer.android.com/reference/androidx/transition/Transition) `@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/android/animation/Animator.html` `https://developer.android.com/reference/androidx/transition/Transition#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)(

@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/view/ViewGroup.html sceneRoot,

@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/TransitionValues startValues,

@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/TransitionValues endValues

)`

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://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` `https://developer.android.com/reference/androidx/transition/Transition#excludeChildren(int,boolean)(@https://developer.android.com/reference/androidx/annotation/IdRes int targetId, boolean exclude)`

Whether to add the children of the given id to the list of targets to exclude from this transition.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` `https://developer.android.com/reference/androidx/transition/Transition#excludeChildren(android.view.View,boolean)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/view/View.html target, boolean exclude)`

Whether to add the children of given target to the list of target children to exclude from this transition.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` `https://developer.android.com/reference/androidx/transition/Transition#excludeChildren(java.lang.Class<?>,boolean)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/Class.html<@https://developer.android.com/reference/androidx/annotation/NonNull ?> type, boolean exclude)`

Whether to add the given type to the list of types whose children should be excluded from this transition.
`long` `https://developer.android.com/reference/androidx/transition/Transition#getDuration()()`

Returns the duration set on this transition.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/android/graphics/Rect.html` `https://developer.android.com/reference/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://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/Transition.EpicenterCallback` `https://developer.android.com/reference/androidx/transition/Transition#getEpicenterCallback()()`

Returns the callback used to find the epicenter of the Transition.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/android/animation/TimeInterpolator.html` `https://developer.android.com/reference/androidx/transition/Transition#getInterpolator()()`

Returns the interpolator set on this transition.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/String.html` `https://developer.android.com/reference/androidx/transition/Transition#getName()()`

Returns the name of this Transition.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/PathMotion` `https://developer.android.com/reference/androidx/transition/Transition#getPathMotion()()`

Returns the algorithm object used to interpolate along two dimensions.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/TransitionPropagation` `https://developer.android.com/reference/androidx/transition/Transition#getPropagation()()`

Returns the `https://developer.android.com/reference/android/transition/TransitionPropagation.html` used to calculate Animator start delays.
`final @https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` `https://developer.android.com/reference/androidx/transition/Transition#getRootTransition()()`

If this Transition is not part of a TransitionSet, this is returned.
`long` `https://developer.android.com/reference/androidx/transition/Transition#getStartDelay()()`

Returns the startDelay set on this transition.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/util/List.html<https://developer.android.com/reference/java/lang/Integer.html>` `https://developer.android.com/reference/androidx/transition/Transition#getTargetIds()()`

Returns the array of target IDs that this transition limits itself to tracking and animating.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/java/util/List.html<https://developer.android.com/reference/java/lang/String.html>` `https://developer.android.com/reference/androidx/transition/Transition#getTargetNames()()`

Returns the list of target transitionNames that this transition limits itself to tracking and animating.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/java/util/List.html<https://developer.android.com/reference/java/lang/Class.html<@https://developer.android.com/reference/androidx/annotation/NonNull ?>>` `https://developer.android.com/reference/androidx/transition/Transition#getTargetTypes()()`

Returns the list of target transitionNames that this transition limits itself to tracking and animating.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/util/List.html<https://developer.android.com/reference/android/view/View.html>` `https://developer.android.com/reference/androidx/transition/Transition#getTargets()()`

Returns the array of target views that this transition limits itself to tracking and animating.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html String[]` `https://developer.android.com/reference/androidx/transition/Transition#getTransitionProperties()()`

Returns the set of property names used stored in the `https://developer.android.com/reference/androidx/transition/TransitionValues` object passed into `https://developer.android.com/reference/androidx/transition/Transition#captureStartValues(androidx.transition.TransitionValues)` that this transition cares about for the purposes of canceling overlapping animations.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/TransitionValues` `https://developer.android.com/reference/androidx/transition/Transition#getTransitionValues(android.view.View,boolean)(@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/view/View.html view, boolean start)`

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

@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/TransitionValues startValues,

@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/TransitionValues endValues

)`

Returns whether or not the transition should create an Animator, based on the values captured during `https://developer.android.com/reference/androidx/transition/Transition#captureStartValues(androidx.transition.TransitionValues)` and `https://developer.android.com/reference/androidx/transition/Transition#captureEndValues(androidx.transition.TransitionValues)`.
`void` `https://developer.android.com/reference/androidx/transition/Transition#setMatchOrder(int...)(@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html int[] matches)`

Sets the order in which Transition matches View start and end values.
`@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/String.html` `https://developer.android.com/reference/androidx/transition/Transition#toString()()`

## Constants

### ORDERING_SEQUENTIAL

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

```
public static final int ORDERING_SEQUENTIAL = 1
```

A flag used to indicate that the child transitions of this set should play in sequence; when one child transition ends, the next child transition begins. Note that a transition does not end until all instances of it (which are playing on all applicable targets of the transition) end.

### ORDERING_TOGETHER

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

```
public static final int ORDERING_TOGETHER = 0
```

A flag used to indicate that the child transitions of this set should all start at the same time.

## Public constructors

### TransitionSet

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

```
public TransitionSet()
```

Constructs an empty transition set. Add child transitions to the set by calling `https://developer.android.com/reference/androidx/transition/TransitionSet#addTransition(androidx.transition.Transition)` )}. By default, child transitions will play `https://developer.android.com/reference/androidx/transition/TransitionSet#ORDERING_TOGETHER()`.

### TransitionSet

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

```
public TransitionSet(@NonNull Context context, @NonNull AttributeSet attrs)
```

## Public methods

### addListener

```
public @NonNull TransitionSet addListener(@NonNull Transition.TransitionListener listener)
```

Adds a listener to the set of listeners that are sent events through the life of an animation, such as start, repeat, and end.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition.TransitionListener listener` | the listener to be added to the current set of listeners for this animation. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | This transition object. |

### addTarget

```
public @NonNull TransitionSet addTarget(@IdRes int targetId)
```

Adds the id of a target view that this Transition is interested in animating. By default, there are no targetIds, and a Transition will listen for changes on every view in the hierarchy below the sceneRoot of the Scene being transitioned into. Setting targetIds constrains the Transition to only listen for, and act on, views with these IDs. Views with different IDs, or no IDs whatsoever, will be ignored.

Note that using ids to specify targets implies that ids should be unique within the view hierarchy underneath the scene root.

| Parameters |
|---|---|
| `@https://developer.android.com/reference/androidx/annotation/IdRes int targetId` | The id of a target view, must be a positive number. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | The Transition to which the targetId is added. Returning the same object makes it easier to chain calls during construction, such as `transitionSet.addTransitions(new Fade()).addTarget(someId);` |

| See also |
|---|---|
| `https://developer.android.com/reference/android/view/View.html#getId()` |   |

### addTarget

```
public @NonNull TransitionSet addTarget(@NonNull String targetName)
```

Adds the transitionName of a target view that this Transition is interested in animating. By default, there are no targetNames, and a Transition will listen for changes on every view in the hierarchy below the sceneRoot of the Scene being transitioned into. Setting targetNames constrains the Transition to only listen for, and act on, views with these transitionNames. Views with different transitionNames, or no transitionName whatsoever, will be ignored.

Note that transitionNames should be unique within the view hierarchy.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/String.html targetName` | The transitionName of a target view, must be non-null. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | The Transition to which the target transitionName is added. Returning the same object makes it easier to chain calls during construction, such as `transitionSet.addTransitions(new Fade()).addTarget(someName);` |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/core/view/ViewCompat#getTransitionName(android.view.View)` |   |

### addTarget

```
public @NonNull TransitionSet addTarget(@NonNull Class<@NonNull ?> targetType)
```

Adds the Class of a target view that this Transition is interested in animating. By default, there are no targetTypes, and a Transition will listen for changes on every view in the hierarchy below the sceneRoot of the Scene being transitioned into. Setting targetTypes constrains the Transition to only listen for, and act on, views with these classes. Views with different classes will be ignored.

Note that any View that can be cast to targetType will be included, so if targetType is `View.class`, all Views will be included.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/Class.html<@https://developer.android.com/reference/androidx/annotation/NonNull ?> targetType` | The type to include when running this transition. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | The Transition to which the target class was added. Returning the same object makes it easier to chain calls during construction, such as `transitionSet.addTransitions(new Fade()).addTarget(ImageView.class);` |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/transition/Transition#addTarget(int)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#addTarget(android.view.View)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#excludeTarget(java.lang.Class<?>,boolean)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#excludeChildren(java.lang.Class<?>,boolean)` |   |

### addTarget

```
public @NonNull TransitionSet addTarget(@NonNull View target)
```

Sets the target view instances that this Transition is interested in animating. By default, there are no targets, and a Transition will listen for changes on every view in the hierarchy below the sceneRoot of the Scene being transitioned into. Setting targets constrains the Transition to only listen for, and act on, these views. All other views will be ignored.

The target list is like the `https://developer.android.com/reference/androidx/transition/Transition#addTarget(int)` list except this list specifies the actual View instances, not the ids of the views. This is an important distinction when scene changes involve view hierarchies which have been inflated separately; different views may share the same id but not actually be the same instance. If the transition should treat those views as the same, then `https://developer.android.com/reference/androidx/transition/Transition#addTarget(int)` should be used instead of `https://developer.android.com/reference/androidx/transition/Transition#addTarget(android.view.View)`. If, on the other hand, scene changes involve changes all within the same view hierarchy, among views which do not necessarily have ids set on them, then the target list of views may be more convenient.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/view/View.html target` | A View on which the Transition will act, must be non-null. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | The Transition to which the target is added. Returning the same object makes it easier to chain calls during construction, such as `transitionSet.addTransitions(new Fade()).addTarget(someView);` |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/transition/Transition#addTarget(int)` |   |

### addTransition

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

```
public @NonNull TransitionSet addTransition(@NonNull Transition transition)
```

Adds child transition to this set. The order in which this child transition is added relative to other child transitions that are added, in addition to the `https://developer.android.com/reference/androidx/transition/TransitionSet#getOrdering()` property, determines the order in which the transitions are started.

If this transitionSet has a `https://developer.android.com/reference/androidx/transition/Transition#getDuration()`, `https://developer.android.com/reference/androidx/transition/Transition#getInterpolator()`, `https://developer.android.com/reference/androidx/transition/Transition#getPropagation()`, `https://developer.android.com/reference/androidx/transition/Transition#getPathMotion()`, or `https://developer.android.com/reference/androidx/transition/TransitionSet#setEpicenterCallback(androidx.transition.Transition.EpicenterCallback)` set on it, the child transition will inherit the values that are set. Transitions are assumed to have a maximum of one transitionSet parent.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition transition` | A non-null child transition to be added to this set. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | This transitionSet object. |

### captureEndValues

```
public void captureEndValues(@NonNull TransitionValues transitionValues)
```

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/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/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 |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionValues 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/androidx/transition/Transition#captureStartValues(androidx.transition.TransitionValues)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)` |   |

### captureStartValues

```
public void captureStartValues(@NonNull TransitionValues transitionValues)
```

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/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/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 |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionValues 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/androidx/transition/Transition#captureEndValues(androidx.transition.TransitionValues)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#createAnimator(android.view.ViewGroup,androidx.transition.TransitionValues,androidx.transition.TransitionValues)` |   |

### clone

```
public @NonNull Transition clone()
```

### excludeTarget

```
public @NonNull Transition excludeTarget(int targetId, boolean exclude)
```

Whether to add the given id to the list of target ids to exclude from this transition. The `exclude` parameter specifies whether the target should be added to or removed from the excluded list.

Excluding targets is a general mechanism for allowing transitions to run on a view hierarchy while skipping target views that should not be part of the transition. For example, you may want to avoid animating children of a specific ListView or Spinner. Views can be excluded either by their id, or by their instance reference, or by the Class of that view (eg, `https://developer.android.com/reference/android/widget/Spinner.html`).

| Parameters |
|---|---|
| `int targetId` | The id of a target to ignore when running this transition. |
| `boolean exclude` | Whether to add the target to or remove the target from the current list of excluded targets. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` | This transition object. |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/transition/Transition#excludeChildren(int,boolean)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#excludeTarget(android.view.View,boolean)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#excludeTarget(java.lang.Class<?>,boolean)` |   |

### excludeTarget

```
public @NonNull Transition excludeTarget(@NonNull String targetName, boolean exclude)
```

Whether to add the given transitionName to the list of target transitionNames to exclude from this transition. The `exclude` parameter specifies whether the target should be added to or removed from the excluded list.

Excluding targets is a general mechanism for allowing transitions to run on a view hierarchy while skipping target views that should not be part of the transition. For example, you may want to avoid animating children of a specific ListView or Spinner. Views can be excluded by their id, their instance reference, their transitionName, or by the Class of that view (eg, `https://developer.android.com/reference/android/widget/Spinner.html`).

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/String.html targetName` | The name of a target to ignore when running this transition. |
| `boolean exclude` | Whether to add the target to or remove the target from the current list of excluded targets. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` | This transition object. |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/transition/Transition#excludeTarget(android.view.View,boolean)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#excludeTarget(int,boolean)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#excludeTarget(java.lang.Class<?>,boolean)` |   |

### excludeTarget

```
public @NonNull Transition excludeTarget(@NonNull View target, boolean exclude)
```

Whether to add the given target to the list of targets to exclude from this transition. The `exclude` parameter specifies whether the target should be added to or removed from the excluded list.

Excluding targets is a general mechanism for allowing transitions to run on a view hierarchy while skipping target views that should not be part of the transition. For example, you may want to avoid animating children of a specific ListView or Spinner. Views can be excluded either by their id, or by their instance reference, or by the Class of that view (eg, `https://developer.android.com/reference/android/widget/Spinner.html`).

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/view/View.html target` | The target to ignore when running this transition. |
| `boolean exclude` | Whether to add the target to or remove the target from the current list of excluded targets. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` | This transition object. |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/transition/Transition#excludeChildren(android.view.View,boolean)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#excludeTarget(int,boolean)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#excludeTarget(java.lang.Class<?>,boolean)` |   |

### excludeTarget

```
public @NonNull Transition excludeTarget(@NonNull Class<@NonNull ?> type, boolean exclude)
```

Whether to add the given type to the list of types to exclude from this transition. The `exclude` parameter specifies whether the target type should be added to or removed from the excluded list.

Excluding targets is a general mechanism for allowing transitions to run on a view hierarchy while skipping target views that should not be part of the transition. For example, you may want to avoid animating children of a specific ListView or Spinner. Views can be excluded either by their id, or by their instance reference, or by the Class of that view (eg, `https://developer.android.com/reference/android/widget/Spinner.html`).

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/Class.html<@https://developer.android.com/reference/androidx/annotation/NonNull ?> type` | The type to ignore when running this transition. |
| `boolean exclude` | Whether to add the target type to or remove it from the current list of excluded target types. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition` | This transition object. |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/transition/Transition#excludeChildren(java.lang.Class<?>,boolean)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#excludeTarget(int,boolean)` |   |
| `https://developer.android.com/reference/androidx/transition/Transition#excludeTarget(android.view.View,boolean)` |   |

### getOrdering

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

```
public int getOrdering()
```

Returns the ordering of this TransitionSet. By default, the value is `https://developer.android.com/reference/androidx/transition/TransitionSet#ORDERING_TOGETHER()`.

| Returns |
|---|---|
| `int` | `https://developer.android.com/reference/androidx/transition/TransitionSet#ORDERING_TOGETHER()` if child transitions will play at the same time, `https://developer.android.com/reference/androidx/transition/TransitionSet#ORDERING_SEQUENTIAL()` if they will play in sequence. |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/transition/TransitionSet#setOrdering(int)` |   |

### getTransitionAt

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

```
public @Nullable Transition getTransitionAt(int index)
```

Returns the child Transition at the specified position in the TransitionSet.

| Parameters |
|---|---|
| `int index` | The position of the Transition to retrieve. |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/transition/TransitionSet#addTransition(androidx.transition.Transition)` |   |
| `https://developer.android.com/reference/androidx/transition/TransitionSet#getTransitionCount()` |   |

### getTransitionCount

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

```
public int getTransitionCount()
```

Returns the number of child transitions in the TransitionSet.

| Returns |
|---|---|
| `int` | The number of child transitions in the TransitionSet. |

| See also |
|---|---|
| `https://developer.android.com/reference/androidx/transition/TransitionSet#addTransition(androidx.transition.Transition)` |   |
| `https://developer.android.com/reference/androidx/transition/TransitionSet#getTransitionAt(int)` |   |

### isSeekingSupported

```
public boolean isSeekingSupported()
```

Returns `true` if the Transition can be used by `https://developer.android.com/reference/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/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/androidx/transition/Transition.TransitionListener` can be added to `https://developer.android.com/reference/androidx/transition/Transition#getRootTransition()` and it can listen for `https://developer.android.com/reference/androidx/transition/Transition.TransitionListener#onTransitionEnd(androidx.transition.Transition)`.

### removeListener

```
public @NonNull TransitionSet removeListener(@NonNull Transition.TransitionListener listener)
```

Removes a listener from the set listening to this animation.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition.TransitionListener listener` | the listener to be removed from the current set of listeners for this transition. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | This transition object. |

### removeTarget

```
public @NonNull TransitionSet removeTarget(@NonNull Class<@NonNull ?> target)
```

Removes the given target from the list of targets that this Transition is interested in animating.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/Class.html<@https://developer.android.com/reference/androidx/annotation/NonNull ?> target` | The type of the target view, must be non-null. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | Transition The Transition from which the target is removed. Returning the same object makes it easier to chain calls during construction, such as `transitionSet.addTransitions(new Fade()).removeTarget(someType);` |

### removeTarget

```
public @NonNull TransitionSet removeTarget(@IdRes int targetId)
```

Removes the given targetId from the list of ids that this Transition is interested in animating.

| Parameters |
|---|---|
| `@https://developer.android.com/reference/androidx/annotation/IdRes int targetId` | The id of a target view, must be a positive number. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | The Transition from which the targetId is removed. Returning the same object makes it easier to chain calls during construction, such as `transitionSet.addTransitions(new Fade()).removeTargetId(someId);` |

### removeTarget

```
public @NonNull TransitionSet removeTarget(@NonNull String targetName)
```

Removes the given targetName from the list of transitionNames that this Transition is interested in animating.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/java/lang/String.html targetName` | The transitionName of a target view, must not be null. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | The Transition from which the targetName is removed. Returning the same object makes it easier to chain calls during construction, such as `transitionSet.addTransitions(new Fade()).removeTargetName(someName);` |

### removeTarget

```
public @NonNull TransitionSet removeTarget(@NonNull View target)
```

Removes the given target from the list of targets that this Transition is interested in animating.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/android/view/View.html target` | The target view, must be non-null. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | Transition The Transition from which the target is removed. Returning the same object makes it easier to chain calls during construction, such as `transitionSet.addTransitions(new Fade()).removeTarget(someView);` |

### removeTransition

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

```
public @NonNull TransitionSet removeTransition(@NonNull Transition transition)
```

Removes the specified child transition from this set.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/Transition transition` | The transition to be removed. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | This transitionSet object. |

### setDuration

```
public @NonNull TransitionSet setDuration(long duration)
```

Setting a non-negative duration on a TransitionSet causes all of the child transitions (current and future) to inherit this duration.

| Parameters |
|---|---|
| `long duration` | The length of the animation, in milliseconds. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | This transitionSet object. |

### setEpicenterCallback

```
public void setEpicenterCallback(
    @Nullable Transition.EpicenterCallback epicenterCallback
)
```

Sets the callback to use to find the epicenter of a Transition. A null value indicates that there is no epicenter in the Transition and onGetEpicenter() will return null. Transitions like `https://developer.android.com/reference/android/transition/Explode.html` use a point or Rect to orient the direction of travel. This is called the epicenter of the Transition and is typically centered on a touched View. The `https://developer.android.com/reference/android/transition/Transition.EpicenterCallback.html` allows a Transition to dynamically retrieve the epicenter during a Transition.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/Transition.EpicenterCallback epicenterCallback` | The callback to use to find the epicenter of the Transition. |

### setInterpolator

```
public @NonNull TransitionSet setInterpolator(@Nullable TimeInterpolator interpolator)
```

Sets the interpolator of this transition. By default, the interpolator is null, which means that the Animator created by the transition will have its own specified interpolator. If the interpolator of a Transition is set, that interpolator will override the Animator interpolator.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/android/animation/TimeInterpolator.html interpolator` | The time interpolator used by the transition |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | This transition object. |

### setOrdering

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

```
public @NonNull TransitionSet setOrdering(int ordering)
```

Sets the play order of this set's child transitions.

| Parameters |
|---|---|
| `int ordering` | `https://developer.android.com/reference/androidx/transition/TransitionSet#ORDERING_TOGETHER()` to play this set's child transitions together, `https://developer.android.com/reference/androidx/transition/TransitionSet#ORDERING_SEQUENTIAL()` to play the child transitions in sequence. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | This transitionSet object. |

### setPathMotion

```
public void setPathMotion(@Nullable PathMotion pathMotion)
```

Sets the algorithm used to calculate two-dimensional interpolation.

Transitions such as `https://developer.android.com/reference/android/transition/ChangeBounds.html` move Views, typically in a straight path between the start and end positions. Applications that desire to have these motions move in a curve can change how Views interpolate in two dimensions by extending PathMotion and implementing `https://developer.android.com/reference/android/transition/PathMotion.html#getPath(float, float, float, float)`.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/PathMotion pathMotion` | Algorithm object to use for determining how to interpolate in two dimensions. If null, a straight-path algorithm will be used. |

| See also |
|---|---|
| `https://developer.android.com/reference/android/transition/ArcMotion.html` |   |
| `https://developer.android.com/reference/androidx/transition/PatternPathMotion` |   |
| `https://developer.android.com/reference/android/transition/PathMotion.html` |   |

### setPropagation

```
public void setPropagation(@Nullable TransitionPropagation transitionPropagation)
```

Sets the method for determining Animator start delays. When a Transition affects several Views like `https://developer.android.com/reference/android/transition/Explode.html` or `https://developer.android.com/reference/android/transition/Slide.html`, there may be a desire to have a "wave-front" effect such that the Animator start delay depends on position of the View. The TransitionPropagation specifies how the start delays are calculated.

| Parameters |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/Nullable.html https://developer.android.com/reference/androidx/transition/TransitionPropagation transitionPropagation` | The class used to determine the start delay of Animators created by this Transition. A null value indicates that no delay should be used. |

### setStartDelay

```
public @NonNull TransitionSet setStartDelay(long startDelay)
```

Sets the startDelay of this transition. By default, there is no delay (indicated by a negative number), which means that the Animator created by the transition will have its own specified startDelay. If the delay of a Transition is set, that delay will override the Animator delay.

| Parameters |
|---|---|
| `long startDelay` | The length of the delay, in milliseconds. |

| Returns |
|---|---|
| `@https://jspecify.dev/docs/api/org/jspecify/annotations/NonNull.html https://developer.android.com/reference/androidx/transition/TransitionSet` | This transition object. |