TransitionSet

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.

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).

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).

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).

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.

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

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.

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.

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.

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>&lt;changeBounds&gt;
      &lt;pathMotion class="my.app.transition.MyPathMotion"/&gt;
  &lt;/changeBounds&gt;</code>

or

<code>&lt;changeBounds&gt;
    &lt;arcMotion android:minimumHorizontalAngle="15"
               android:minimumVerticalAngle="0"
               android:maximumAngle="90"/&gt;
  &lt;/changeBounds&gt;</code>

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.