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

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

The Configuration module defines environment change information. Configuration is an interface definition and is used only for field declaration.

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.

Modules to Import

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

Attributes

System capability: SystemCapability.Ability.AbilityBase

Name	Type	Readable	Writable	Description
language	string	Yes	Yes	Language of the application, for example, zh.
colorMode	ColorMode	Yes	Yes	Color mode. The default value is COLOR_MODE_LIGHT. The options are as follows: - COLOR_MODE_NOT_SET: The color mode is not set. - COLOR_MODE_LIGHT: light mode. - COLOR_MODE_DARK: dark mode.
direction	Direction	Yes	No	Screen orientation. The options are as follows: - DIRECTION_NOT_SET: The screen orientation is not set. - DIRECTION_HORIZONTAL: horizontal direction. - DIRECTION_VERTICAL: vertical direction.
screenDensity	ScreenDensity	Yes	No	Pixel density of the screen. The options are as follows: - SCREEN_DENSITY_NOT_SET: The pixel density is not set. - SCREEN_DENSITY_SDPI: 120. - SCREEN_DENSITY_MDPI: 160. - SCREEN_DENSITY_LDPI: 240. - SCREEN_DENSITY_XLDPI: 320. - SCREEN_DENSITY_XXLDPI: 480. - SCREEN_DENSITY_XXXLDPI: 640.
displayId	number	Yes	No	ID of the display where the application is located.
hasPointerDevice	boolean	Yes	No	Whether a pointer device, such as a keyboard, mouse, or touchpad, is connected.

For details about the fields, see the ohos.app.ability.Configuration.d.ts file.

Example

import UIAbility from '@ohos.app.ability.UIAbility';
import AbilityConstant from '@ohos.app.ability.AbilityConstant';
import EnvironmentCallback from '@ohos.app.ability.EnvironmentCallback';
import Want from '@ohos.app.ability.Want';

export default class EntryAbility extends UIAbility {
    onCreate(want: Want, launchParam: AbilityConstant.LaunchParam) {
        let envCallback: EnvironmentCallback = {
            onConfigurationUpdated(config) {
                console.info(`envCallback onConfigurationUpdated success: ${JSON.stringify(config)}`);
                let language = config.language;
                let colorMode = config.colorMode;
                let direction = config.direction;
                let screenDensity = config.screenDensity;
                let displayId = config.displayId;
                let hasPointerDevice = config.hasPointerDevice;
            }
            onMemoryLevel(level){
                console.log('onMemoryLevel level: ${level}');
            }
        };
        try {
            let applicationContext = this.context.getApplicationContext();
            let callbackId = applicationContext.on('environment', envCallback);
            console.log('callbackId: ${callbackId}');
        } catch (paramError) {
            console.error(`error: ${paramError.code}, ${paramError.message}`);
        }
    }
}