harmony 鸿蒙@ohos.app.ability.AbilityStage (AbilityStage)

2022-12-22
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@ohos.app.ability.AbilityStage (AbilityStage)

AbilityStage is a runtime class for HAP files.

AbilityStage notifies you of when you can perform HAP initialization such as resource pre-loading and thread creation during the HAP loading.

NOTE

The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version. The APIs of this module can be used only in the stage model.

Modules to Import

import AbilityStage from '@ohos.app.ability.AbilityStage';

AbilityStage.onCreate

onCreate(): void

Called when the application is created.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Example

import AbilityStage from '@ohos.app.ability.AbilityStage';

class MyAbilityStage extends AbilityStage {
    onCreate() {
        console.log('MyAbilityStage.onCreate is called');
    }
}

AbilityStage.onAcceptWant

onAcceptWant(want: Want): string;

Called when a specified ability is started.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Parameters

Name	Type	Mandatory	Description
want	Want	Yes	Want information about the target ability, such as the ability name and bundle name.

Return value

Type	Description
string	Returns an ability ID. If this ability has been started, no new instance is created and the ability is placed at the top of the stack. Otherwise, a new instance is created and started.

Example

import AbilityStage from '@ohos.app.ability.AbilityStage';
import Want from '@ohos.app.ability.Want';

class MyAbilityStage extends AbilityStage {
    onAcceptWant(want: Want) {
        console.log('MyAbilityStage.onAcceptWant called');
        return 'com.example.test';
    }
}

AbilityStage.onConfigurationUpdate

onConfigurationUpdate(newConfig: Configuration): void;

Called when the global configuration is updated.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Parameters

Name	Type	Mandatory	Description
newConfig	Configuration	Yes	Callback invoked when the global configuration is updated. The global configuration indicates the configuration of the environment where the application is running and includes the language and color mode.

Example

import AbilityStage from '@ohos.app.ability.AbilityStage';
import { Configuration } from '@ohos.app.ability.Configuration';

class MyAbilityStage extends AbilityStage {
    onConfigurationUpdate(config: Configuration) {
        console.log('onConfigurationUpdate, language: ${config.language}');
    }
}

AbilityStage.onMemoryLevel

onMemoryLevel(level: AbilityConstant.MemoryLevel): void;

Called when the system has decided to adjust the memory level. For example, this API can be used when there is not enough memory to run as many background processes as possible.

System capability: SystemCapability.Ability.AbilityRuntime.Core

Parameters

Name	Type	Mandatory	Description
level	AbilityConstant.MemoryLevel	Yes	Memory level that indicates the memory usage status. When the specified memory level is reached, a callback will be invoked and the system will start adjustment.

Example

import AbilityStage from '@ohos.app.ability.AbilityStage';
import AbilityConstant from '@ohos.app.ability.AbilityConstant';

class MyAbilityStage extends AbilityStage {
    onMemoryLevel(level: AbilityConstant.MemoryLevel) {
        console.log(`onMemoryLevel, level: ${JSON.stringify(level)}`);
    } 
}