harmony 鸿蒙@ohos.brightness (Screen Brightness) (System API)
@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);
}
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