OpenHarmony实现屏幕亮度动态调节方法详解

import brightness from '@system.brightness';

 brightness.setKeepScreenOn({
      //设置保持屏幕常亮
      keepScreenOn: true,
      //接口调用成功的回调函数。
      success: function () {
        console.log('设置成功')
      },
      //接口调用失败的回调函数。
      fail: function (data, code) {
        console.log('设置失败 错误码code:' + code + ', data: ' + data);
      },
    });

/*
 * Copyright (c) 2022 JianGuo Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @ProjectName : AbilityDemo
 * @FileName : brightness
 * @Author : 坚果
 * @Time : 2022/9/29 9:36
 * @Description : 屏幕亮度设置
 */
import router from '@ohos.router';
import brightness from '@system.brightness';
@Entry
@Component
struct brightnessSample {
  @State message: string = '亮度调节'
  @State progressValue: number = 0;
  onPageShow(){
    brightness.setKeepScreenOn({
      //设置保持屏幕常亮
      keepScreenOn: true,
      //接口调用成功的回调函数。
      success: function () {
        console.log('设置成功')
      },
      //接口调用失败的回调函数。
      fail: function (data, code) {
        console.log('设置失败 错误码code:' + code + ', data: ' + data);
      },
    });
  }
  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(20)
          .fontWeight(FontWeight.Bold).onClick(() => {
          router.back()
        })
      }
      .width('100%')
    }
    .height('100%')
  }
}

interface ProgressInterface {
  (options: ProgressOptions): ProgressAttribute;
}
declare interface ProgressOptions {
  value: number; // 必须要指定初始进度
  total?: number;
  style?: ProgressStyle
  type?: ProgressType
}

static setKeepScreenOn(options?: SetKeepScreenOnOptions): void;

export interface SetKeepScreenOnOptions {
    /**
     * Whether to always keep the screen on.
     */
    keepScreenOn: boolean;
    /**
     * Called when the setting is successful.
     */
    success?: () => void;
    /**
     * Called when the setting fails.
     */
    fail?: (data: string, code: number) => void;
    /**
     * Called when the execution is completed.
     */
    complete?: () => void
}

import router from '@ohos.router';
import brightness from '@system.brightness';
@Entry
@Component
struct brightnessSample {
  @State message: string = '亮度调节'
  @State progressValue: number = 0;
aboutToAppear(){
  setInterval(()=>{
    if(this.progressValue < 100){
      this.progressValue += 5
    }
    brightness.setValue({
      value: this.progressValue *2.5,
      success: function(){
        console.log('handling set brightness success.');
      },
      fail: function(data, code){
        console.log('handling set brightness value fail, code:' + code + ', data: ' + data);
      },
    });
  },500)
  }
  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(20)
          .fontWeight(FontWeight.Bold).onClick(() => {
          router.back()
        })
        Progress({
          value: this.progressValue,           // 设置当前进度
          total: 100,                  // 设置进度总量
          type: ProgressType.Linear
        })
          .style({strokeWidth: 18})      // 设置进度条线宽
          .size({width: '100%', height: 40})
      }
      .width('100%')
    }
    .height('100%')
  }
}