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added in version 25.1.0
belongs to Maven artifact com.android.support:transition:28.0.0-alpha1
Summary: Nested Classes | Constants | Ctors | Methods | Inherited Methods | [Expand All]

Transition

public abstract class Transition
extends Object implements Cloneable

java.lang.Object
   ↳ android.support.transition.Transition
Known Direct Subclasses
Known Indirect Subclasses

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:

     <changeBounds/>

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:

     <transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
          android:transitionOrdering="sequential">
         <changeBounds/>
         <fade android:fadingMode="fade_out">
             <targets>
                 <target android:targetId="@id/grayscaleContainer"/>
             </targets>
         </fade>
     </transitionSet>

In this example, the transitionOrdering attribute is used on the TransitionSet object to change from the default ORDERING_TOGETHER behavior to be ORDERING_SEQUENTIAL instead. Also, the Fade transition uses a fadingMode of OUT instead of the default out-in behavior. Finally, note the use of the targets sub-tag, which takes a set of {code target} tags, each of which lists a specific targetId 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.

Summary

Nested classes

class Transition.EpicenterCallback

Class to get the epicenter of Transition. 

interface Transition.TransitionListener

A transition listener receives notifications from a transition. 

Constants

int MATCH_ID

With setMatchOrder(int), chooses to match by getId().

int MATCH_INSTANCE

With setMatchOrder(int), chooses to match by View instance.

int MATCH_ITEM_ID

With setMatchOrder(int), chooses to match by the Adapter item id.

int MATCH_NAME

With setMatchOrder(int), chooses to match by getTransitionName().

Public constructors

Transition()

Constructs a Transition object with no target objects.

Transition(Context context, AttributeSet attrs)

Perform inflation from XML and apply a class-specific base style from a theme attribute or style resource.

Public methods

Transition addListener(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.

Transition addTarget(View target)

Sets the target view instances that this Transition is interested in animating.

Transition addTarget(int targetId)

Adds the id of a target view that this Transition is interested in animating.

Transition addTarget(Class targetType)

Adds the Class of a target view that this Transition is interested in animating.

Transition addTarget(String targetName)

Adds the transitionName of a target view that this Transition is interested in animating.

abstract void captureEndValues(TransitionValues transitionValues)

Captures the values in the end scene for the properties that this transition monitors.

abstract void captureStartValues(TransitionValues transitionValues)

Captures the values in the start scene for the properties that this transition monitors.

Transition clone()
Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues, 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.

Transition excludeChildren(int targetId, boolean exclude)

Whether to add the children of the given id to the list of targets to exclude from this transition.

Transition excludeChildren(Class type, boolean exclude)

Whether to add the given type to the list of types whose children should be excluded from this transition.

Transition excludeChildren(View target, boolean exclude)

Whether to add the children of given target to the list of target children to exclude from this transition.

Transition excludeTarget(View target, boolean exclude)

Whether to add the given target to the list of targets to exclude from this transition.

Transition excludeTarget(Class type, boolean exclude)

Whether to add the given type to the list of types to exclude from this transition.

Transition excludeTarget(String targetName, boolean exclude)

Whether to add the given transitionName to the list of target transitionNames to exclude from this transition.

Transition excludeTarget(int targetId, boolean exclude)

Whether to add the given id to the list of target ids to exclude from this transition.

long getDuration()

Returns the duration set on this transition.

Rect getEpicenter()

Returns the epicenter as specified by the Transition.EpicenterCallback or null if no callback exists.

Transition.EpicenterCallback getEpicenterCallback()

Returns the callback used to find the epicenter of the Transition.

TimeInterpolator getInterpolator()

Returns the interpolator set on this transition.

String getName()

Returns the name of this Transition.

PathMotion getPathMotion()

Returns the algorithm object used to interpolate along two dimensions.

TransitionPropagation getPropagation()

Returns the TransitionPropagation used to calculate Animator start delays.

long getStartDelay()

Returns the startDelay set on this transition.

List<Integer> getTargetIds()

Returns the array of target IDs that this transition limits itself to tracking and animating.

List<String> getTargetNames()

Returns the list of target transitionNames that this transition limits itself to tracking and animating.

List<Class> getTargetTypes()

Returns the list of target transitionNames that this transition limits itself to tracking and animating.

List<View> getTargets()

Returns the array of target views that this transition limits itself to tracking and animating.

String[] getTransitionProperties()

Returns the set of property names used stored in the TransitionValues object passed into captureStartValues(TransitionValues) that this transition cares about for the purposes of canceling overlapping animations.

TransitionValues getTransitionValues(View view, boolean start)

This method can be called by transitions to get the TransitionValues for any particular view during the transition-playing process.

boolean isTransitionRequired(TransitionValues startValues, TransitionValues endValues)

Returns whether or not the transition should create an Animator, based on the values captured during captureStartValues(TransitionValues) and captureEndValues(TransitionValues).

Transition removeListener(Transition.TransitionListener listener)

Removes a listener from the set listening to this animation.

Transition removeTarget(int targetId)

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

Transition removeTarget(View target)

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

Transition removeTarget(String targetName)

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

Transition removeTarget(Class target)

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

Transition setDuration(long duration)

Sets the duration of this transition.

void setEpicenterCallback(Transition.EpicenterCallback epicenterCallback)

Sets the callback to use to find the epicenter of a Transition.

Transition setInterpolator(TimeInterpolator interpolator)

Sets the interpolator of this transition.

void setMatchOrder(int... matches)

Sets the order in which Transition matches View start and end values.

void setPathMotion(PathMotion pathMotion)

Sets the algorithm used to calculate two-dimensional interpolation.

void setPropagation(TransitionPropagation transitionPropagation)

Sets the method for determining Animator start delays.

Transition setStartDelay(long startDelay)

Sets the startDelay of this transition.

String toString()

Inherited methods

From class java.lang.Object

Constants

MATCH_ID

added in version 26.1.0 
int MATCH_ID

With setMatchOrder(int), chooses to match by getId(). Negative IDs will not be matched.

Constant Value: 3 (0x00000003)

MATCH_INSTANCE

added in version 26.1.0 
int MATCH_INSTANCE

With setMatchOrder(int), chooses to match by View instance.

Constant Value: 1 (0x00000001)

MATCH_ITEM_ID

added in version 26.1.0 
int MATCH_ITEM_ID

With setMatchOrder(int), chooses to match by the Adapter item id. When hasStableIds() returns false, no match will be made for items.

Constant Value: 4 (0x00000004)

MATCH_NAME

added in version 26.1.0 
int MATCH_NAME

With setMatchOrder(int), chooses to match by getTransitionName(). Null names will not be matched.

Constant Value: 2 (0x00000002)

Public constructors

Transition

added in version 25.1.0
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

added in version 26.1.0
Transition (Context context, 
                AttributeSet attrs)

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

added in version 25.1.0
Transition addListener (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
listener Transition.TransitionListener: the listener to be added to the current set of listeners for this animation.
Returns
Transition This transition object.

addTarget

added in version 25.1.0
Transition addTarget (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 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(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
target View: A View on which the Transition will act, must be non-null.
Returns
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:

addTarget

added in version 25.1.0
Transition addTarget (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
targetId int: The id of a target view, must be a positive number.
Returns
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

added in version 26.1.0
Transition addTarget (Class 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
targetType Class: The type to include when running this transition.
Returns
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

added in version 26.1.0
Transition addTarget (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
targetName String: The transitionName of a target view, must be non-null.
Returns
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);

captureEndValues

added in version 25.1.0
void captureEndValues (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 createAnimator(ViewGroup, TransitionValues, 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(ViewGroup, TransitionValues, 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.

captureStartValues

added in version 25.1.0
void captureStartValues (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 createAnimator(ViewGroup, TransitionValues, 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(ViewGroup, TransitionValues, 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

added in version 26.1.0
Transition clone ()

Returns
Transition

createAnimator

added in version 25.1.0
Animator createAnimator (ViewGroup sceneRoot, 
                TransitionValues startValues, 
                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. Subclasses of Transition should override this method. The method should only be called by the transition system; it is not intended