| java.lang.Object | |
| ↳ | android.support.v4.app.SharedElementCallback |
Listener provided in
setEnterSharedElementCallback(SharedElementCallback) and
setExitSharedElementCallback(SharedElementCallback)
to monitor the Activity transitions. The events can be used to customize Activity
Transition behavior.
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| Public Methods | |||||||||||
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Creates a snapshot of a shared element to be used by the remote Activity and reconstituted
with
onCreateSnapshotView(android.content.Context, android.os.Parcelable).
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Reconstitutes a snapshot View from a Parcelable returned in
onCaptureSharedElementSnapshot(android.view.View, android.graphics.Matrix, android.graphics.RectF) to be used in onSharedElementStart(java.util.List, java.util.List, java.util.List) and onSharedElementEnd(java.util.List, java.util.List, java.util.List).
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Lets the SharedElementCallback adjust the mapping of shared element names to
Views.
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Called after
onMapSharedElements(java.util.List, java.util.Map) when
transferring shared elements in.
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In Activity Transitions, onSharedElementEnd is called immediately before
capturing the end of the shared element state on enter and reenter transitions and
immediately before capturing the start of the shared element state for exit and return
transitions.
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In Activity Transitions, onSharedElementStart is called immediately before
capturing the start of the shared element state on enter and reenter transitions and
immediately before capturing the end of the shared element state for exit and return
transitions.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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Creates a snapshot of a shared element to be used by the remote Activity and reconstituted
with onCreateSnapshotView(android.content.Context, android.os.Parcelable). A
null return value will mean that the remote Activity will have a null snapshot View in
onSharedElementStart(java.util.List, java.util.List, java.util.List) and
onSharedElementEnd(java.util.List, java.util.List, java.util.List).
This is not called for Fragment Transitions.
| sharedElement | The shared element View to create a snapshot for. |
|---|---|
| viewToGlobalMatrix | A matrix containing a transform from the view to the screen coordinates. |
| screenBounds | The bounds of shared element in screen coordinate space. This is the bounds of the view with the viewToGlobalMatrix applied. |
Developers
onCreateSnapshotView(android.content.Context, android.os.Parcelable) and passed
into onSharedElementStart(java.util.List, java.util.List, java.util.List) and
onSharedElementEnd(java.util.List, java.util.List, java.util.List).
Reconstitutes a snapshot View from a Parcelable returned in
onCaptureSharedElementSnapshot(android.view.View, android.graphics.Matrix, android.graphics.RectF) to be used in onSharedElementStart(java.util.List, java.util.List, java.util.List) and onSharedElementEnd(java.util.List, java.util.List, java.util.List). The returned View will be sized and positioned after
this call so that it is ready to be added to the decor View's overlay.
This is not called for Fragment Transitions.
| context | The Context used to create the snapshot View. |
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| snapshot | The Parcelable returned by onCaptureSharedElementSnapshot(android.view.View, android.graphics.Matrix, android.graphics.RectF). |
onSharedElementStart(java.util.List, java.util.List, java.util.List) and onSharedElementEnd(java.util.List, java.util.List, java.util.List). A null value will produce a null snapshot value for those two methods.
Lets the SharedElementCallback adjust the mapping of shared element names to Views.
| names | The names of all shared elements transferred from the calling Activity or Fragment in the order they were provided. |
|---|---|
| sharedElements | The mapping of shared element names to Views. The best guess will be filled into sharedElements based on the transitionNames. |
Called after onMapSharedElements(java.util.List, java.util.Map) when
transferring shared elements in. Any shared elements that have no mapping will be in
rejectedSharedElements. The elements remaining in
rejectedSharedElements will be transitioned out of the Scene. If a
View is removed from rejectedSharedElements, it must be handled by the
SharedElementListener.
Views in rejectedSharedElements will have their position and size set to the position of the calling shared element, relative to the Window decor View and contain snapshots of the View from the calling Activity or Fragment. This view may be safely added to the decor View's overlay to remain in position.
This method is not called for Fragment Transitions. All rejected shared elements will be handled by the exit transition.
| rejectedSharedElements | Views containing visual information of shared elements that are not part of the entering scene. These Views are positioned relative to the Window decor View. A View removed from this list will not be transitioned automatically. |
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In Activity Transitions, onSharedElementEnd is called immediately before capturing the end of the shared element state on enter and reenter transitions and immediately before capturing the start of the shared element state for exit and return transitions.
In Fragment Transitions, onSharedElementEnd is called immediately before capturing the end state of all shared element transitions.
This call can be used to adjust the transition end state by modifying the shared element Views. Note that no layout step will be executed between onSharedElementEnd and the transition state capture.
Any changes made in onSharedElementStart(List, List, List) that are not updated
during layout should be corrected in onSharedElementEnd. For example, rotation or scale
will not be affected by layout and if changed in
onSharedElementStart(List, List, List), it will also have to be reset in
onSharedElementEnd again to correct the end state.
| sharedElementNames | The names of the shared elements that were accepted into the View hierarchy. |
|---|---|
| sharedElements | The shared elements that are part of the View hierarchy. |
| sharedElementSnapshots | The Views containing snap shots of the shared element from the launching Window. These elements will not be part of the scene, but will be positioned relative to the Window decor View. This list will be null for Fragment Transitions. |
In Activity Transitions, onSharedElementStart is called immediately before capturing the start of the shared element state on enter and reenter transitions and immediately before capturing the end of the shared element state for exit and return transitions.
In Fragment Transitions, onSharedElementStart is called immediately before capturing the start state of all shared element transitions.
This call can be used to adjust the transition start state by modifying the shared element Views. Note that no layout step will be executed between onSharedElementStart and the transition state capture.
For Activity Transitions, any changes made in onSharedElementEnd(List, List, List)
that are not updated during layout should be corrected in onSharedElementStart for exit and
return transitions. For example, rotation or scale will not be affected by layout and
if changed in onSharedElementEnd(List, List, List), it will also have to be reset
in onSharedElementStart again to correct the end state.
| sharedElementNames | The names of the shared elements that were accepted into the View hierarchy. |
|---|---|
| sharedElements | The shared elements that are part of the View hierarchy. |
| sharedElementSnapshots | The Views containing snap shots of the shared element from the launching Window. These elements will not be part of the scene, but will be positioned relative to the Window decor View. This list is null for Fragment Transitions. |