程序包 ohos.aafwk.ability

类 LifecycleObserver

java.lang.Object

ohos.aafwk.ability.LifecycleObserver

所有已实现的接口:

ILifecycleObserver

public class LifecycleObserver
extends Object
implements ILifecycleObserver

Observes and responds to lifecycle changes.

Lifecycle dispatches a lifecycle event to a registered LifecycleObserver. LifecycleObserver then implements lifecycle callbacks for Ability or AbilitySlice. This allows your application to have a decoupled architecture where Ability or AbilitySlice takes only a single responsibility.

You should inherit the LifecycleObserver class, override lifecycle callback methods as required, and call Lifecycle#addObserver(ILifecycleObserver) to register a LifecycleObserver with Lifecycle. The callback methods in LifecycleObserver provide the same functions as those provided in Ability and AbilitySlice, but they are called in different sequence. The system calls those in Ability and AbilitySlice first and then those in LifecycleObserver. You are advised to use LifecycleObserver for lifecycle callbacks of Ability and AbilitySlice when your application is complicated.

从以下版本开始:

1

另请参阅:

Lifecycle, ILifecycleObserver, LifecycleStateObserver

SystemCapability

SystemCapability.Aafwk#ABILITY

构造器概要

构造器

构造器	说明
LifecycleObserver()

方法概要

限定符和类型	方法	说明
void	onActive()	Called back in response to an ON_ACTIVE event.
void	onBackground()	Called back in response to an ON_BACKGROUND event.
void	onForeground(Intent intent)	Called back in response to an ON_FOREGROUND event, where information for the ability or ability slice to go back to the ACTIVE state is carried in the intent parameter.
void	onInactive()	Called back in response to an ON_INACTIVE event.
void	onStart(Intent intent)	Called back in response to an ON_START event, where the startup information is carried in the intent parameter.
void	onStop()	Called back in response to an ON_STOP event.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

LifecycleObserver

public LifecycleObserver()

方法详细资料

onStart

public void onStart(Intent intent)

Called back in response to an ON_START event, where the startup information is carried in the intent parameter.

This method initializes an Ability or AbilitySlice and is called back only once during the entire lifecycle. You are advised to implement some initialization logic using this method, for example, you can initialize a timer or define some global objects.

参数:

intent - Indicates the startup information.

从以下版本开始:

1

另请参阅:

Ability.onStart(Intent), AbilitySlice.onStart(Intent)

onInactive

public void onInactive()

Called back in response to an ON_INACTIVE event.

When an ON_INACTIVE event is received, the ability or ability slice is in the INACTIVE state. INACTIVE is an intermediate state before the state changes to ACTIVE or BACKGROUND. In this state, the UI may be visible but is not interactive. You are advised not to use this method to invoke complex service logic.

从以下版本开始:

1

另请参阅:

Ability.onInactive(), AbilitySlice.onInactive()

onActive

public void onActive()

Called back in response to an ON_ACTIVE event.

When an ON_ACTIVE event is received, the ability or ability slice is in the foreground and is interactive.

从以下版本开始:

1

另请参阅:

Ability.onActive(), AbilitySlice.onActive()

onBackground

public void onBackground()

Called back in response to an ON_BACKGROUND event.

When an ON_BACKGROUND event is received, the ability or ability slice is invisible. You are advised to suspend the threads related to this ability or ability slice and clear resources for more system memory.

从以下版本开始:

1

另请参阅:

Ability.onBackground(), AbilitySlice.onBackground()

onForeground

public void onForeground(Intent intent)

Called back in response to an ON_FOREGROUND event, where information for the ability or ability slice to go back to the ACTIVE state is carried in the intent parameter.

When an ON_FOREGROUND event is received, the ability or ability slice returns to the foreground. You can use this method to implement re-initialization or adjust the UI display by using the intent parameter.

参数:

intent - Indicates the information for the ability or ability slice to go back to the ACTIVE state.

从以下版本开始:

1

另请参阅:

Ability.onForeground(Intent), AbilitySlice.onForeground(Intent)

onStop

public void onStop()

Called back in response to an ON_STOP event.

This method is called back when the lifecycle of the ability or ability slice is destroyed. You can reclaim resources using this method.

从以下版本开始:

1

另请参阅:

Ability.onStop(), AbilitySlice.onStop()