程序包 ohos.aafwk.ability

枚举 Lifecycle.Event

java.lang.Object

java.lang.Enum<Lifecycle.Event>

ohos.aafwk.ability.Lifecycle.Event

所有已实现的接口:

Serializable, Comparable<Lifecycle.Event>

封闭类:

Lifecycle

public static enum Lifecycle.Event
extends Enum<Lifecycle.Event>

Indicates a lifecycle event. The system dispatches an Event when the lifecycle state changes.

The system schedules a lifecycle change and dispatches an Event to Lifecycle. Lifecycle then dispatches the Event to a registered ILifecycleObserver for responding to the lifecycle change.

For example, if a registered LifecycleObserver receives an ON_ACTIVE event, it will call LifecycleObserver#onActive() to change the ability or ability slice to the ACTIVE state.

SystemCapability

SystemCapability.Aafwk#ABILITY

枚举常量概要

枚举常量

枚举常量	说明
ON_ACTIVE	Event indicating that the ability or ability slice enters the ACTIVE state.
ON_BACKGROUND	Event indicating that the ability or ability slice enters the BACKGROUND state.
ON_FOREGROUND	Event indicating that the lifecycle state of the ability or ability slice is changing from BACKGROUND to INACTIVE.
ON_INACTIVE	Event indicating that the ability or ability slice enters the INACTIVE state.
ON_START	Event indicating the start of the lifecycle.
ON_STOP	Event indicating that the lifecycle is about to be destroyed.
UNDEFINED	Undefined lifecycle event, indicating that the lifecycle may have not started or have been destroyed.

方法概要

限定符和类型	方法	说明
static Lifecycle.Event	valueOf(String name)	返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)
static Lifecycle.Event[]	values()	按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示: for (Lifecycle.Event c : Lifecycle.Event.values()) System.out.println(c);

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

UNDEFINED

public static final Lifecycle.Event UNDEFINED

Undefined lifecycle event, indicating that the lifecycle may have not started or have been destroyed.

从以下版本开始:

1

ON_START

public static final Lifecycle.Event ON_START

Event indicating the start of the lifecycle.

从以下版本开始:

1

ON_INACTIVE

public static final Lifecycle.Event ON_INACTIVE

Event indicating that the ability or ability slice enters the INACTIVE state.

从以下版本开始:

1

ON_ACTIVE

public static final Lifecycle.Event ON_ACTIVE

Event indicating that the ability or ability slice enters the ACTIVE state.

从以下版本开始:

1

ON_BACKGROUND

public static final Lifecycle.Event ON_BACKGROUND

Event indicating that the ability or ability slice enters the BACKGROUND state.

从以下版本开始:

1

ON_FOREGROUND

public static final Lifecycle.Event ON_FOREGROUND

Event indicating that the lifecycle state of the ability or ability slice is changing from BACKGROUND to INACTIVE.

从以下版本开始:

1

ON_STOP

public static final Lifecycle.Event ON_STOP

Event indicating that the lifecycle is about to be destroyed.

从以下版本开始:

1

方法详细资料

values

public static Lifecycle.Event[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (Lifecycle.Event c : Lifecycle.Event.values())
    System.out.println(c);

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static Lifecycle.Event valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

NullPointerException - 如果参数为空值