Transition
abstract class Transition : Cloneable
kotlin.Any | |
↳ | android.transition.Transition |
A Transition holds information about animations that will be run on its targets during a scene change. Subclasses of this abstract class may choreograph several child transitions (TransitionSet
or they may perform custom animations themselves. Any Transition has two main jobs: (1) capture property values, and (2) play animations based on changes to captured property values. A custom transition knows what property values on View objects are of interest to it, and also knows how to animate changes to those values. For example, the Fade
transition tracks changes to visibility-related properties and is able to construct and run animations that fade items in or out based on changes to those properties.
Note: Transitions may not work correctly with either SurfaceView
or TextureView
, due to the way that these views are displayed on the screen. For SurfaceView, the problem is that the view is updated from a non-UI thread, so changes to the view due to transitions (such as moving and resizing the view) may be out of sync with the display inside those bounds. TextureView is more compatible with transitions in general, but some specific transitions (such as Fade
) may not be compatible with TextureView because they rely on ViewOverlay
functionality, which does not currently work with TextureView.
Transitions can be declared in XML resource files inside the res/transition
directory. Transition resources consist of a tag name for one of the Transition subclasses along with attributes to define some of the attributes of that transition. For example, here is a minimal resource file that declares a ChangeBounds
transition:
This TransitionSet contains android.transition.Explode
for visibility, android.transition.ChangeBounds
, android.transition.ChangeTransform
, and android.transition.ChangeClipBounds
and android.transition.ChangeImageTransform
:
Custom transition classes may be instantiated with a transition
tag:
<transition class="my.app.transition.CustomTransition"/>
Custom transition classes loaded from XML should have a public constructor taking a android.content.Context
and android.util.AttributeSet
.
Note that attributes for the transition are not required, just as they are optional when declared in code; Transitions created from XML resources will use the same defaults as their code-created equivalents. Here is a slightly more elaborate example which declares a TransitionSet
transition with ChangeBounds
and Fade
child transitions:
In this example, the transitionOrdering attribute is used on the TransitionSet object to change from the default TransitionSet#ORDERING_TOGETHER
behavior to be TransitionSet#ORDERING_SEQUENTIAL
instead. Also, the Fade
transition uses a fadingMode of Fade#OUT
instead of the default out-in behavior. Finally, note the use of the targets
sub-tag, which takes a set of target
tags, each of which lists a specific targetId
, targetClass
, targetName
, excludeId
, excludeClass
, or excludeName
, which this transition acts upon. Use of targets is optional, but can be used to either limit the time spent checking attributes on unchanging views, or limiting the types of animations run on specific views. In this case, we know that only the grayscaleContainer
will be disappearing, so we choose to limit the Fade
transition to only that view.
android.R.styleable#Transition
, android.R.styleable#TransitionSet
, android.R.styleable#TransitionTarget
, android.R.styleable#Fade
, android.R.styleable#Slide
, and android.R.styleable#ChangeTransform
.
Summary
Nested classes | |
---|---|
abstract |
Class to get the epicenter of Transition. |
abstract |
A transition listener receives notifications from a transition. |
Constants | |
---|---|
static Int |
With |
static Int |
With |
static Int |
With |
static Int |
With |
Public constructors | |
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Constructs a Transition object with no target objects. |
|
Transition(context: Context!, attrs: AttributeSet!) Perform inflation from XML and apply a class-specific base style from a theme attribute or style resource. |
Public methods | |
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open Transition! |
addListener(listener: 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. |
open Transition! |
Adds the id of a target view that this Transition is interested in animating. |
open Transition! |
Adds the transitionName of a target view that this Transition is interested in animating. |
open Transition! |
Adds the Class of a target view that this Transition is interested in animating. |
open Transition! |
Sets the target view instances that this Transition is interested in animating. |
open Boolean | |
abstract Unit |
captureEndValues(transitionValues: TransitionValues!) Captures the values in the end scene for the properties that this transition monitors. |
abstract Unit |
captureStartValues(transitionValues: TransitionValues!) Captures the values in the start scene for the properties that this transition monitors. |
open Transition |
clone() |
open Animator? |
createAnimator(sceneRoot: ViewGroup, startValues: TransitionValues?, endValues: 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. |
open Transition! |
excludeChildren(targetId: Int, exclude: Boolean) Whether to add the children of the given id to the list of targets to exclude from this transition. |
open Transition! |
excludeChildren(target: View!, exclude: Boolean) Whether to add the children of given target to the list of target children to exclude from this transition. |
open Transition! |
excludeChildren(type: Class<Any!>!, exclude: Boolean) Whether to add the given type to the list of types whose children should be excluded from this transition. |
open Transition! |
excludeTarget(targetId: Int, exclude: Boolean) Whether to add the given id to the list of target ids to exclude from this transition. |
open Transition! |
excludeTarget(targetName: String!, exclude: Boolean) Whether to add the given transitionName to the list of target transitionNames to exclude from this transition. |
open Transition! |
excludeTarget(target: View!, exclude: Boolean) Whether to add the given target to the list of targets to exclude from this transition. |
open Transition! |
excludeTarget(type: Class<Any!>!, exclude: Boolean) Whether to add the given type to the list of types to exclude from this transition. |
open Long |
Returns the duration set on this transition. |
open Rect! |
Returns the epicenter as specified by the |
open Transition.EpicenterCallback! |
Returns the callback used to find the epicenter of the Transition. |
open TimeInterpolator! |
Returns the interpolator set on this transition. |
open String! |
getName() Returns the name of this Transition. |
open PathMotion! |
Returns the algorithm object used to interpolate along two dimensions. |
open TransitionPropagation! |
Returns the |
open Long |
Returns the startDelay set on this transition. |
open MutableList<Int!>! |
Returns the list of target IDs that this transition limits itself to tracking and animating. |
open MutableList<String!>! |
Returns the list of target transitionNames that this transition limits itself to tracking and animating. |
open MutableList<Class<Any!>!>! |
Returns the list of target transitionNames that this transition limits itself to tracking and animating. |
open MutableList<View!>! |
Returns the list of target views that this transition limits itself to tracking and animating. |
open Array<String!>! |
Returns the set of property names used stored in the |
open TransitionValues! |
getTransitionValues(view: View!, start: Boolean) This method can be called by transitions to get the TransitionValues for any particular view during the transition-playing process. |
open Boolean |
isTransitionRequired(startValues: TransitionValues?, endValues: TransitionValues?) Returns whether or not the transition should create an Animator, based on the values captured during |
open Transition! |
removeListener(listener: Transition.TransitionListener!) Removes a listener from the set listening to this animation. |
open Transition! |
removeTarget(targetId: Int) Removes the given targetId from the list of ids that this Transition is interested in animating. |
open Transition! |
removeTarget(targetName: String!) Removes the given targetName from the list of transitionNames that this Transition is interested in animating. |
open Transition! |
removeTarget(target: View!) Removes the given target from the list of targets that this Transition is interested in animating. |
open Transition! |
removeTarget(target: Class<Any!>!) Removes the given target from the list of targets that this Transition is interested in animating. |
open Transition! |
setDuration(duration: Long) Sets the duration of this transition. |
open Unit |
setEpicenterCallback(epicenterCallback: Transition.EpicenterCallback!) Sets the callback to use to find the epicenter of a Transition. |
open Transition! |
setInterpolator(interpolator: TimeInterpolator!) Sets the interpolator of this transition. |
open Unit |
setMatchOrder(vararg matches: Int) Sets the order in which Transition matches View start and end values. |
open Unit |
setPathMotion(pathMotion: PathMotion!) Sets the algorithm used to calculate two-dimensional interpolation. |
open Unit |
setPropagation(transitionPropagation: TransitionPropagation!) Sets the method for determining Animator start delays. |
open Transition! |
setStartDelay(startDelay: Long) Sets the startDelay of this transition. |
open String |
toString() |
Constants
MATCH_ID
static val MATCH_ID: Int
With setMatchOrder(int...)
, chooses to match by android.view.View#getId()
. Negative IDs will not be matched.
Value: 3
MATCH_INSTANCE
static val MATCH_INSTANCE: Int
With setMatchOrder(int...)
, chooses to match by View instance.
Value: 1
MATCH_ITEM_ID
static val MATCH_ITEM_ID: Int
With setMatchOrder(int...)
, chooses to match by the android.widget.Adapter
item id. When android.widget.Adapter#hasStableIds()
returns false, no match will be made for items.
Value: 4
MATCH_NAME
static val MATCH_NAME: Int
With setMatchOrder(int...)
, chooses to match by android.view.View#getTransitionName()
. Null names will not be matched.
Value: 2
Public constructors
Transition
Transition()
Constructs a Transition object with no target objects. A transition with no targets defaults to running on all target objects in the scene hierarchy (if the transition is not contained in a TransitionSet), or all target objects passed down from its parent (if it is in a TransitionSet).
Transition
Transition(
context: Context!,
attrs: AttributeSet!)
Perform inflation from XML and apply a class-specific base style from a theme attribute or style resource. This constructor of Transition allows subclasses to use their own base style when they are inflating.
Parameters | |
---|---|
context |
Context!: The Context the transition is running in, through which it can access the current theme, resources, etc. |
attrs |
AttributeSet!: The attributes of the XML tag that is inflating the transition. |
Public methods
addListener
open fun addListener(listener: Transition.TransitionListener!): Transition!
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 | |
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listener |
Transition.TransitionListener!: the listener to be added to the current set of listeners for this animation. |
Return | |
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Transition! |
This transition object. |
addTarget
open fun addTarget(targetId: Int): Transition!
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 | |
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targetId |
Int: The id of a target view, must be a positive number. |
Return | |
---|---|
Transition! |
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
addTarget
open fun addTarget(targetName: String!): Transition!
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 | |
---|---|
targetName |
String!: The transitionName of a target view, must be non-null. |
Return | |
---|---|
Transition! |
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); |
addTarget
open fun addTarget(targetType: Class<Any!>!): Transition!
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 | |
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targetType |
Class<Any!>!: The type to include when running this transition. |
Return | |
---|---|
Transition! |
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); |
addTarget
open fun addTarget(target: View!): Transition!
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 targetId
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 addTarget(int)
should be used instead of 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 | |
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target |
View!: A View on which the Transition will act, must be non-null. |
Return | |
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Transition! |
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
captureEndValues
abstract 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 createAnimator(android.view.ViewGroup,android.transition.TransitionValues,android.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 createAnimator(android.view.ViewGroup,android.transition.TransitionValues,android.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 | |
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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. |
captureStartValues
abstract 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 createAnimator(android.view.ViewGroup,android.transition.TransitionValues,android.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 createAnimator(android.view.ViewGroup,android.transition.TransitionValues,android.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 |
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. |
clone
open fun clone(): Transition
Return | |
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Transition |
a clone of this instance. |
Exceptions | |
---|---|
java.lang.CloneNotSupportedException |
if the object's class does not support the Cloneable interface. Subclasses that override the clone method can also throw this exception to indicate that an instance cannot be cloned. |
createAnimator
open 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 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 TransitionValues#view
field.
Parameters | |
---|---|
sceneRoot |
ViewGroup: The root of the transition hierarchy. This value cannot be null . |
startValues |
TransitionValues?: The values for a specific target in the start scene, or null if the target doesn't exist in the start scene. |
endValues |
TransitionValues?: The values for the target in the end scene, or null if the target doesn't exist in the end scene. |
Return | |
---|---|
Animator? |
an 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. |
excludeChildren
open fun excludeChildren(
targetId: Int,
exclude: Boolean
): Transition!
Whether to add the children of the given id to the list of targets to exclude from this transition. The exclude
parameter specifies whether the children of the target should be added to or removed from the excluded list. Excluding children in this way provides a simple mechanism for excluding all children of specific targets, rather than individually excluding each child individually.
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, Spinner
).
Parameters | |
---|---|
targetId |
Int: The id of a target whose children should be ignored when running this transition. |
exclude |
Boolean: Whether to add the target to or remove the target from the current list of excluded-child targets. |
Return | |
---|---|
Transition! |
This transition object. |
excludeChildren
open fun excludeChildren(
target: View!,
exclude: Boolean
): Transition!
Whether to add the children of given target to the list of target children 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, Spinner
).
Parameters | |
---|---|
target |
View!: The target to ignore when running this transition. |
exclude |
Boolean: Whether to add the target to or remove the target from the current list of excluded targets. |
Return | |
---|---|
Transition! |
This transition object. |
excludeChildren
open fun excludeChildren(
type: Class<Any!>!,
exclude: Boolean
): Transition!
Whether to add the given type to the list of types whose children should be excluded 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, Spinner
).
Parameters | |
---|---|
type |
Class<Any!>!: The type to ignore when running this transition. |
exclude |
Boolean: Whether to add the target type to or remove it from the current list of excluded target types. |
Return | |
---|---|
Transition! |
This transition object. |
excludeTarget
open fun excludeTarget(
targetId: Int,
exclude: Boolean
): Transition!
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, Spinner
).
Parameters | |
---|---|
targetId |
Int: The id of a target to ignore when running this transition. |
exclude |
Boolean: Whether to add the target to or remove the target from the current list of excluded targets. |
Return | |
---|---|
Transition! |
This transition object. |
excludeTarget
open fun excludeTarget(
targetName: String!,
exclude: Boolean
): Transition!
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, Spinner
).
Parameters | |
---|---|
targetName |
String!: The name of a target to ignore when running this transition. |
exclude |
Boolean: Whether to add the target to or remove the target from the current list of excluded targets. |
Return | |
---|---|
Transition! |
This transition object. |
excludeTarget
open fun excludeTarget(
target: View!,
exclude: Boolean
): Transition!
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, Spinner
).
Parameters | |
---|---|
target |
View!: The target to ignore when running this transition. |
exclude |
Boolean: Whether to add the target to or remove the target from the current list of excluded targets. |
Return | |
---|---|
Transition! |
This transition object. |
excludeTarget
open fun excludeTarget(
type: Class<Any!>!,
exclude: Boolean
): Transition!
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, Spinner
).
Parameters | |
---|---|
type |
Class<Any!>!: The type to ignore when running this transition. |
exclude |
Boolean: Whether to add the target type to or remove it from the current list of excluded target types. |
Return | |
---|---|
Transition! |
This transition object. |
getDuration
open fun getDuration(): Long
Returns the duration set on this transition. If no duration has been set, the returned value will be negative, indicating that resulting animators will retain their own durations.
Return | |
---|---|
Long |
The duration set on this transition, in milliseconds, if one has been set, otherwise returns a negative number. |
getEpicenter
open fun getEpicenter(): Rect!
Returns the epicenter as specified by the android.transition.Transition.EpicenterCallback
or null if no callback exists.
Return | |
---|---|
Rect! |
the epicenter as specified by the android.transition.Transition.EpicenterCallback or null if no callback exists. |
getEpicenterCallback
open fun getEpicenterCallback(): Transition.EpicenterCallback!
Returns the callback used to find the epicenter of the Transition. Transitions like android.transition.Explode
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 android.transition.Transition.EpicenterCallback
allows a Transition to dynamically retrieve the epicenter during a Transition.
Return | |
---|---|
Transition.EpicenterCallback! |
the callback used to find the epicenter of the Transition. |
getInterpolator
open fun getInterpolator(): TimeInterpolator!
Returns the interpolator set on this transition. If no interpolator has been set, the returned value will be null, indicating that resulting animators will retain their own interpolators.
Return | |
---|---|
TimeInterpolator! |
The interpolator set on this transition, if one has been set, otherwise returns null. |
getName
open fun getName(): String!
Returns the name of this Transition. This name is used internally to distinguish between different transitions to determine when interrupting transitions overlap. For example, a ChangeBounds running on the same target view as another ChangeBounds should determine whether the old transition is animating to different end values and should be canceled in favor of the new transition.
By default, a Transition's name is simply the value of Class#getName()
, but subclasses are free to override and return something different.
Return | |
---|---|
String! |
The name of this transition. |
getPathMotion
open fun getPathMotion(): PathMotion!
Returns the algorithm object used to interpolate along two dimensions. This is typically used to determine the View motion between two points.
When describing in XML, use a nested XML tag for the path motion. It can be one of the built-in tags arcMotion
or patternPathMotion
or it can be a custom PathMotion using pathMotion
with the class
attributed with the fully-described class name. For example:
<code><changeBounds> <pathMotion class="my.app.transition.MyPathMotion"/> </changeBounds></code>
or
<code><changeBounds> <arcMotion android:minimumHorizontalAngle="15" android:minimumVerticalAngle="0" android:maximumAngle="90"/> </changeBounds></code>
Return | |
---|---|
PathMotion! |
The algorithm object used to interpolate along two dimensions. |
getPropagation
open fun getPropagation(): TransitionPropagation!
Returns the android.transition.TransitionPropagation
used to calculate Animator start delays. When a Transition affects several Views like android.transition.Explode
or android.transition.Slide
, 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.
Return | |
---|---|
TransitionPropagation! |
the android.transition.TransitionPropagation used to calculate Animator start delays. This is null by default. |
getStartDelay
open fun getStartDelay(): Long
Returns the startDelay set on this transition. If no startDelay has been set, the returned value will be negative, indicating that resulting animators will retain their own startDelays.
Return | |
---|---|
Long |
The startDelay set on this transition, in milliseconds, if one has been set, otherwise returns a negative number. |
getTargetIds
open fun getTargetIds(): MutableList<Int!>!
Returns the list of target IDs that this transition limits itself to tracking and animating. If the list is null or empty for getTargetIds()
, getTargets()
, getTargetNames()
, and getTargetTypes()
then this transition is not limited to specific views, and will handle changes to any views in the hierarchy of a scene change.
Return | |
---|---|
MutableList<Int!>! |
the list of target IDs |
getTargetNames
open fun getTargetNames(): MutableList<String!>!
Returns the list of target transitionNames that this transition limits itself to tracking and animating. If the list is null or empty for getTargetIds()
, getTargets()
, getTargetNames()
, and getTargetTypes()
then this transition is not limited to specific views, and will handle changes to any views in the hierarchy of a scene change.
Return | |
---|---|
MutableList<String!>! |
the list of target transitionNames |
getTargetTypes
open fun getTargetTypes(): MutableList<Class<Any!>!>!
Returns the list of target transitionNames that this transition limits itself to tracking and animating. If the list is null or empty for getTargetIds()
, getTargets()
, getTargetNames()
, and getTargetTypes()
then this transition is not limited to specific views, and will handle changes to any views in the hierarchy of a scene change.
Return | |
---|---|
MutableList<Class<Any!>!>! |
the list of target Types |
getTargets
open fun getTargets(): MutableList<View!>!
Returns the list of target views that this transition limits itself to tracking and animating. If the list is null or empty for getTargetIds()
, getTargets()
, getTargetNames()
, and getTargetTypes()
then this transition is not limited to specific views, and will handle changes to any views in the hierarchy of a scene change.
Return | |
---|---|
MutableList<View!>! |
the list of target views |
getTransitionProperties
open fun getTransitionProperties(): Array<String!>!
Returns the set of property names used stored in the TransitionValues
object passed into captureStartValues(android.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.
Return | |
---|---|
Array<String!>! |
An array of property names as described in the class documentation for TransitionValues . The default implementation returns null . |
getTransitionValues
open fun getTransitionValues(
view: View!,
start: Boolean
): TransitionValues!
This method can be called by transitions to get the TransitionValues for any particular view during the transition-playing process. This might be necessary, for example, to query the before/after state of related views for a given transition.
isTransitionRequired
open fun isTransitionRequired(
startValues: TransitionValues?,
endValues: TransitionValues?
): Boolean
Returns whether or not the transition should create an Animator, based on the values captured during captureStartValues(android.transition.TransitionValues)
and captureEndValues(android.transition.TransitionValues)
. The default implementation compares the property values returned from getTransitionProperties()
, or all property values if getTransitionProperties()
returns null. Subclasses may override this method to provide logic more specific to the transition implementation.
Parameters | |
---|---|
startValues |
TransitionValues?: the values from captureStartValues, This may be null if the View did not exist in the start state. |
endValues |
TransitionValues?: the values from captureEndValues. This may be null if the View did not exist in the end state. |
removeListener
open fun removeListener(listener: Transition.TransitionListener!): Transition!
Removes a listener from the set listening to this animation.
Parameters | |
---|---|
listener |
Transition.TransitionListener!: the listener to be removed from the current set of listeners for this transition. |
Return | |
---|---|
Transition! |
This transition object. |
removeTarget
open fun removeTarget(targetId: Int): Transition!
Removes the given targetId from the list of ids that this Transition is interested in animating.
Parameters | |
---|---|
targetId |
Int: The id of a target view, must be a positive number. |
Return | |
---|---|
Transition! |
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
open fun removeTarget(targetName: String!): Transition!
Removes the given targetName from the list of transitionNames that this Transition is interested in animating.
Parameters | |
---|---|
targetName |
String!: The transitionName of a target view, must not be null. |
Return | |
---|---|
Transition! |
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
open fun removeTarget(target: View!): Transition!
Removes the given target from the list of targets that this Transition is interested in animating.
Parameters | |
---|---|
target |
View!: The target view, must be non-null. |
Return | |
---|---|
Transition! |
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); |
removeTarget
open fun removeTarget(target: Class<Any!>!): Transition!
Removes the given target from the list of targets that this Transition is interested in animating.
Parameters | |
---|---|
target |
Class<Any!>!: The type of the target view, must be non-null. |
Return | |
---|---|
Transition! |
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); |
setDuration
open fun setDuration(duration: Long): Transition!
Sets the duration of this transition. By default, there is no duration (indicated by a negative number), which means that the Animator created by the transition will have its own specified duration. If the duration of a Transition is set, that duration will override the Animator duration.
Parameters | |
---|---|
duration |
Long: The length of the animation, in milliseconds. |
Return | |
---|---|
Transition! |
This transition object. |
setEpicenterCallback
open fun setEpicenterCallback(epicenterCallback: Transition.EpicenterCallback!): Unit
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 android.transition.Explode
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 android.transition.Transition.EpicenterCallback
allows a Transition to dynamically retrieve the epicenter during a Transition.
Parameters | |
---|---|
epicenterCallback |
Transition.EpicenterCallback!: The callback to use to find the epicenter of the Transition. |
setInterpolator
open fun setInterpolator(interpolator: TimeInterpolator!): Transition!
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 | |
---|---|
interpolator |
TimeInterpolator!: The time interpolator used by the transition |
Return | |
---|---|
Transition! |
This transition object. |
setMatchOrder
open fun setMatchOrder(vararg matches: Int): Unit
Sets the order in which Transition matches View start and end values.
The default behavior is to match first by android.view.View#getTransitionName()
, then by View instance, then by android.view.View#getId()
and finally by its item ID if it is in a direct child of ListView. The caller can choose to have only some or all of the values of MATCH_INSTANCE
, MATCH_NAME
, MATCH_ITEM_ID
, and MATCH_ID
. Only the match algorithms supplied will be used to determine whether Views are the the same in both the start and end Scene. Views that do not match will be considered as entering or leaving the Scene.
Parameters | |
---|---|
matches |
Int: A list of zero or more of MATCH_INSTANCE , MATCH_NAME , MATCH_ITEM_ID , and MATCH_ID . If none are provided, then the default match order will be set. |
setPathMotion
open fun setPathMotion(pathMotion: PathMotion!): Unit
Sets the algorithm used to calculate two-dimensional interpolation.
Transitions such as android.transition.ChangeBounds
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 android.transition.PathMotion#getPath(float, float, float, float)
.
When describing in XML, use a nested XML tag for the path motion. It can be one of the built-in tags arcMotion
or patternPathMotion
or it can be a custom PathMotion using pathMotion
with the class
attributed with the fully-described class name. For example:
<code><changeBounds> <pathMotion class="my.app.transition.MyPathMotion"/> </changeBounds> </code>
or
<code><changeBounds> <arcMotion android:minimumHorizontalAngle="15" android:minimumVerticalAngle="0" android:maximumAngle="90"/> </changeBounds> </code>
Parameters | |
---|---|
pathMotion |
PathMotion!: Algorithm object to use for determining how to interpolate in two dimensions. If null, a straight-path algorithm will be used. |
setPropagation
open fun setPropagation(transitionPropagation: TransitionPropagation!): Unit
Sets the method for determining Animator start delays. When a Transition affects several Views like android.transition.Explode
or android.transition.Slide
, 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 | |
---|---|
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
open fun setStartDelay(startDelay: Long): Transition!
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 | |
---|---|
startDelay |
Long: The length of the delay, in milliseconds. |
Return | |
---|---|
Transition! |
This transition object. |
toString
open fun toString(): String
Return | |
---|---|
String |
a string representation of the object. |