@ohos.brightness (Screen Brightness) (System API)

The brightness module provides an API for setting the screen brightness.

NOTE

• The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.

• The APIs provided by this module are system APIs.

Modules to Import

import brightness from '@ohos.brightness';

brightness.setValue

setValue(value: number): void

Sets the screen brightness.

System API: This is a system API.

System capability: SystemCapability.PowerManager.DisplayPowerManager

Parameters

Name	Type	Mandatory	Description
value	number	Yes	Brightness value. Value range: 0 to 255. The value of this parameter must be a number.

Error codes

For details about the error codes, see Screen Brightness Error Codes.

ID	Error Message
4700101	Failed to connect to the service.
401	Parameter error. Possible causes: 1.Mandatory parameters are left unspecified; 2.Incorrect parameter types.
202	Permission verification failed. A non-system application calls a system API.

Example:

try {
    brightness.setValue(128);
} catch(err) {
    console.error('set brightness failed, err: ' + err);
}

brightness.setValue¹¹⁺

setValue(value: number, continuous: boolean): void

Sets the screen brightness. This API is used for continuous brightness adjustment. To achieve a better performance, set continuous to true when you start, and set it to false after you finish.

System API: This is a system API.

System capability: SystemCapability.PowerManager.DisplayPowerManager

Parameters

Name	Type	Mandatory	Description
value	number	Yes	Brightness value. Value range: 0 to 255. The value of this parameter must be a number.
continuous	boolean	Yes	Whether the luminance adjustment is continuous. The value of this parameter must be of the Boolean type.

Error codes

For details about the error codes, see Screen Brightness Error Codes.

ID	Error Message
4700101	Failed to connect to the service.
401	Parameter error. Possible causes: 1.Mandatory parameters are left unspecified; 2.Incorrect parameter types.
202	Permission verification failed. A non-system application calls a system API.

Example:

try {
    brightness.setValue(128, true);
} catch(err) {
    console.error('set brightness failed, err: ' + err);
}