public class PorterDuffColorFilter
extends ColorFilter
java.lang.Object | ||
↳ | android.graphics.ColorFilter | |
↳ | android.graphics.PorterDuffColorFilter |
可用于使用单一颜色和特定 Porter-Duff composite mode
为源像素着色的颜色过滤器。
Public constructors |
|
---|---|
PorterDuffColorFilter(int color, PorterDuff.Mode mode) 创建一个使用指定颜色和Porter-Duff模式的颜色过滤器。 |
Public methods |
|
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boolean |
equals(Object object) 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。 |
Inherited methods |
|
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From class android.graphics.ColorFilter
|
|
From class java.lang.Object
|
PorterDuffColorFilter (int color, PorterDuff.Mode mode)
创建一个使用指定颜色和Porter-Duff模式的颜色过滤器。
Parameters | |
---|---|
color |
int : The ARGB source color used with the specified Porter-Duff mode |
mode |
PorterDuff.Mode : The porter-duff mode that is applied |
boolean equals (Object object)
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:
x
, x.equals(x)
should return true
. x
and y
, x.equals(y)
should return true
if and only if y.equals(x)
returns true
. x
, y
, and z
, if x.equals(y)
returns true
and y.equals(z)
returns true
, then x.equals(z)
should return true
. 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. x
, x.equals(null)
should return false
. 类Object
的equals
方法实现了对象上最可能的等价关系; 也就是说,对于任何非空引用值x
和y
,此方法返回true
当且仅当x
和y
指代相同的对象( x == y
具有值true
)。
请注意,无论何时覆盖此方法,通常都必须覆盖 hashCode
方法,以便维护 hashCode
方法的一般合同,该方法声明相等对象必须具有相同的散列代码。
Parameters | |
---|---|
object |
Object : the reference object with which to compare. |
Returns | |
---|---|
boolean |
true if this object is the same as the obj argument; false otherwise. |
int hashCode ()
返回对象的哈希码值。 此方法支持哈希表的好处,例如由HashMap
提供的哈希表。
hashCode
的总合同是:
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. equals(Object)
method, then calling the hashCode
method on each of the two objects must produce the same integer result. 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. 尽可能合理实用,由类Object
定义的hashCode方法确实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. |