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Summary: XML Attrs | Inherited XML Attrs | Inherited Constants | Ctors | Methods | Inherited Methods

# ChangeTransform

`public class ChangeTransform`
`` `extends Transition` ``

java.lang.Object
↳ | android.transition.Transition
| ↳ | android.transition.ChangeTransform

This Transition captures scale and rotation for Views before and after the scene change and animates those changes during the transition. A change in parent is handled as well by capturing the transforms from the parent before and after the scene change and animating those during the transition.

## Summary

### XML attributes
`android:reparent` | Tells ChangeTransform to track parent changes.
`android:reparentWithOverlay` | A parent change should use an overlay or affect the transform of the transitionining View.

### Inherited XML attributes
From class `android.transition.Transition`
`android:duration` | Amount of time (in milliseconds) that the transition should run.
`android:interpolator` | Interpolator to be used in the animations spawned by this transition.
`android:startDelay` | Delay in milliseconds before the transition starts.

### Inherited constants
From class `android.transition.Transition`
`int` | `MATCH_ID` With `setMatchOrder(int)`, chooses to match by `View.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 `View.getTransitionName()`.

### Public constructors
`ChangeTransform()`
`ChangeTransform(Context context, AttributeSet attrs)`

### Public methods
`void` | `captureEndValues(TransitionValues transitionValues)` Captures the values in the end scene for the properties that this transition monitors.
`void` | `captureStartValues(TransitionValues transitionValues)` Captures the values in the start scene for the properties that this transition monitors.
`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.
`boolean` | `getReparent()` Returns whether parent changes will be tracked by the ChangeTransform.
`boolean` | `getReparentWithOverlay()` Returns whether changes to parent should use an overlay or not.
`String[]` | `getTransitionProperties()` 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.
`void` | `setReparent(boolean reparent)` Sets whether parent changes will be tracked by the ChangeTransform.
`void` | `setReparentWithOverlay(boolean reparentWithOverlay)` Sets whether changes to parent should use an overlay or not.

### Inherited methods
From class `android.transition.Transition`
`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.
`boolean` | `canRemoveViews()`
`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()` Creates and returns a copy of this object.
`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 list 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 list 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(android.transition.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(android.transition.TransitionValues)` and `captureEndValues(android.transition.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()` Returns a string representation of the object.
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## XML attributes

### android:reparent

Tells ChangeTransform to track parent changes. Default is true. Corresponds to `ChangeTransform.setReparent(boolean)`.

May be a boolean value, such as "`true`" or "`false`".

Related methods:

- `setReparent(boolean)`

### android:reparentWithOverlay

A parent change should use an overlay or affect the transform of the transitionining View. Default is true. Corresponds to `ChangeTransform.setReparentWithOverlay(boolean)`.

May be a boolean value, such as "`true`" or "`false`".

Related methods:

- `setReparentWithOverlay(boolean)`

## Public constructors

### ChangeTransform

    public ChangeTransform ()

### ChangeTransform

    public ChangeTransform (Context context,
                    AttributeSet attrs)

Parameters
`context` | `Context`
`attrs` | `AttributeSet`

## Public methods

### captureEndValues

    public 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(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.

### captureStartValues

    public 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(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.

### createAnimator

    public 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 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.
`startValues` | `TransitionValues`: The values for a specific target in the start scene.
`endValues` | `TransitionValues`: The values for the target in the end scene.

Returns
`Animator` | A Animator to be started at the appropriate time in the overall transition for this scene change. A null value means no animation should be run.

### getReparent

    public boolean getReparent ()

Returns whether parent changes will be tracked by the ChangeTransform. If parent changes are tracked, then the transform will adjust to the transforms of the different parents. If they aren't tracked, only the transforms of the transitioning view will be tracked. Default is true.

Related XML Attributes:

- android:reparent

Returns
`boolean` | whether parent changes will be tracked by the ChangeTransform.

### getReparentWithOverlay

    public boolean getReparentWithOverlay ()

Returns whether changes to parent should use an overlay or not. When the parent change doesn't use an overlay, it affects the transforms of the child. The default value is `true`.

Note: when Overlays are not used when a parent changes, a view can be clipped when it moves outside the bounds of its parent. Setting `ViewGroup.setClipChildren(boolean)` and `ViewGroup.setClipToPadding(boolean)` can help. Also, when Overlays are not used and the parent is animating its location, the position of the child view will be relative to its parent's final position, so it may appear to "jump" at the beginning.

Related XML Attributes:

- android:reparentWithOverlay

Returns
`boolean` | `true` when a changed parent should execute the transition inside the scene root's overlay or `false` if a parent change only affects the transform of the transitioning view.

### getTransitionProperties

    public String[] getTransitionProperties ()

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.

Returns
`String[]` | An array of property names as described in the class documentation for `TransitionValues`. The default implementation returns `null`.

### setReparent

    public void setReparent (boolean reparent)

Sets whether parent changes will be tracked by the ChangeTransform. If parent changes are tracked, then the transform will adjust to the transforms of the different parents. If they aren't tracked, only the transforms of the transitioning view will be tracked. Default is true.

Related XML Attributes:

- android:reparent

Parameters
`reparent` | `boolean`: Set to true to track parent changes or false to only track changes of the transitioning view without considering the parent change.

### setReparentWithOverlay

    public void setReparentWithOverlay (boolean reparentWithOverlay)

Sets whether changes to parent should use an overlay or not. When the parent change doesn't use an overlay, it affects the transforms of the child. The default value is `true`.

Note: when Overlays are not used when a parent changes, a view can be clipped when it moves outside the bounds of its parent. Setting `ViewGroup.setClipChildren(boolean)` and `ViewGroup.setClipToPadding(boolean)` can help. Also, when Overlays are not used and the parent is animating its location, the position of the child view will be relative to its parent's final position, so it may appear to "jump" at the beginning.

Related XML Attributes:

- android:reparentWithOverlay

Parameters
`reparentWithOverlay` | `boolean`: `true` when a changed parent should execute the transition inside the scene root's overlay or `false` if a parent change only affects the transform of the transitioning view.

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