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Added in API level 19

TransitionValues

public class TransitionValues
extends Object

java.lang.Object
   ↳ android.transition.TransitionValues


保存转换的缓存值的数据结构。 视场是所有值所属的目标。 值字段是一个映射,它根据转换选择的名称保存字段信息。 这些名称应该是唯一的,以避免破坏由其他转换(例如,常规项目:transition_name:property_name)存储的值。 例如,该平台可能将一个属性“alpha”存储在“推子:alpha”的“推子”中。

这些值在场景变化的captureStartValues(TransitionValues)拍摄阶段被缓存, captureStartValues(TransitionValues)捕获到captureStartValues(TransitionValues) ,并在捕获结束值时再次捕获。 这些开始/结束值然后通过createAnimator(ViewGroup, TransitionValues, TransitionValues)方法传递给转换。

Summary

Fields

public final Map<StringObject> values

由该场景的转场跟踪的一组值

public View view

带有这些值的视图

Public constructors

TransitionValues()

Public methods

boolean equals(Object other)

指示其他某个对象是否“等于”这一个。

int hashCode()

返回对象的哈希码值。

String toString()

返回对象的字符串表示形式。

Inherited methods

From class java.lang.Object

Fields

values

Added in API level 19
Map<StringObject> values

由该场景的转场跟踪的一组值

view

Added in API level 19
View view

带有这些值的视图

Public constructors

TransitionValues

Added in API level 19
TransitionValues ()

Public methods

equals

Added in API level 19
boolean equals (Object other)

指示其他某个对象是否“等于”这一个。

equals方法在非空对象引用上实现等价关系:

  • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
  • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
  • It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
  • For any non-null reference value x, x.equals(null) should return false.

equals类的方法Object实现了对象上最可能的等价关系; 也就是说,对于任何非空参考值xy ,当且仅当xy引用同一对象( x == y的值为true )时,此方法返回true

请注意,无论何时重写此方法,通常都必须重写 hashCode方法,以便维护 hashCode方法的一般合约,该方法声明相等对象必须具有相同的哈希代码。

Parameters
other Object: the reference object with which to compare.
Returns
boolean true if this object is the same as the obj argument; false otherwise.

hashCode

Added in API level 19
int hashCode ()

返回对象的哈希码值。 为了散列表的好处而支持此方法,例如由HashMap提供的HashMap

一般合约 hashCode是:

  • Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
  • If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
  • It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

尽管合理实用,类Object定义的hashCode方法确实会为不同的对象返回不同的整数。 (这通常通过将对象的内部地址转换为整数来实现,但Java TM编程语言不需要此实现技术。)

Returns
int a hash code value for this object.

toString

Added in API level 19
String toString ()

返回对象的字符串表示形式。 一般来说, toString方法返回一个“文本表示”该对象的字符串。 结果应该是一个简洁但内容丰富的表述,对于一个人来说很容易阅读。 建议所有子类重写此方法。

ObjecttoString方法返回一个字符串,其中包含对象为实例的类的名称,符号字符“ @ ”以及对象的哈希代码的无符号十六进制表示形式。 换句话说,这个方法返回一个字符串,其值等于:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

Returns
String a string representation of the object.

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