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Added in API level 21

Summary: Ctors | Methods | Inherited Methods | [Expand All]

public static abstract class Transition.EpicenterCallback
extends Object

java.lang.Object
	android.transition.Transition.EpicenterCallback

获得过渡中心的类。使用setEpicenterCallback(android.transition.Transition.EpicenterCallback)设置用于计算转场震中的回调。覆盖getEpicenter()以返回转场震中的屏幕坐标中的矩形区域。

也可以看看：

Public constructors
`Transition.EpicenterCallback()`

公共方法(Public methods)
`abstract Rect`	`onGetEpicenter(Transition transition)` 实施者必须覆盖以在屏幕坐标中返回过渡的震中。

From class java.lang.Object

Added in API level 21

Transition.EpicenterCallback ()

Added in API level 21

Rect onGetEpicenter (Transition transition)

实施者必须覆盖以在屏幕坐标中返回过渡的震中。像Explode这样的Explode依赖于过渡的震中。在爆炸中，视图沿着震中与视图中心之间的矢量向着或远离震中Rect的中心移动或消失。一些过渡，如Fade不注意震中。

参数(Parameters)
`transition`	`Transition`: The transition for which the epicenter applies.

返回(Returns)
`Rect`	The Rect region of the epicenter of `transition` or null if there is no epicenter.