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Added in API level 21

CameraCharacteristics.Key

public static final class CameraCharacteristics.Key
extends Object

java.lang.Object
   ↳ android.hardware.camera2.CameraCharacteristics.Key<T>


一个 Key是用来做相机的特性场查找与 get(CameraCharacteristics.Key )

例如,获取流配置图:


 StreamConfigurationMap map = cameraCharacteristics.get(
      CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
 

要列举 CameraCharacteristics所有可能的密钥,请参阅 getKeys()

也可以看看:

Summary

Public methods

final boolean equals(Object o)

指示其他某个对象是否“等于”这一个。

String getName()

返回camelCase,句点分隔的名称格式如下: "root.section[.subsections].name"

final int hashCode()

返回对象的哈希码值。

String toString()

以字符串表示形式返回此 CameraCharacteristics.Key

Inherited methods

From class java.lang.Object

Public methods

equals

Added in API level 21
boolean equals (Object o)

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哈希码。

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

getName

Added in API level 21
String getName ()

返回camelCase,句点分隔的名称格式如下: "root.section[.subsections].name"

由Android SDK公开的内置密钥始终以"android."作为前缀; 设备/平台特定的密钥前缀为"com."

例如, CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP的名称为"android.scaler.streamConfigurationMap" ; 而设备特定的键可能看起来像"com.google.nexus.data.private"

Returns
String String representation of the key name

hashCode

Added in API level 21
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

hashCode的总合同是:

  • 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.

toString

Added in API level 21
String toString ()

以字符串表示形式返回此 CameraCharacteristics.Key

"CameraCharacteristics.Key(%s)" ,其中 %s表示由 getName()返回的此密钥的名称。

Returns
String string representation of CameraCharacteristics.Key

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