@ohos.application.Configuration (Configuration)

import Configuration from '@ohos.application.Configuration';

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';
import Window from '@ohos.window';
import { BusinessError } from '@ohos.base';

export default class EntryAbility extends UIAbility {
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam) {
  }

  onDestroy() {
  }

  onWindowStageCreate(windowStage: Window.WindowStage) {
    let envCallback: EnvironmentCallback = {
      onConfigurationUpdated(config) {
        console.info(`envCallback onConfigurationUpdated success: ${JSON.stringify(config)}`);
        let language = config.language;
        let colorMode = config.colorMode;
      },
      onMemoryLevel(level) {
        console.info(`onMemoryLevel level: ${JSON.stringify(level)}`);
      }
    };

    let applicationContext = this.context.getApplicationContext();
    try {
      applicationContext.on('environment', envCallback);
    } catch (paramError) {
      console.error(`error: ${(paramError as BusinessError).code}, ${(paramError as BusinessError).message}`);
    }

    windowStage.loadContent('pages/index', (err, data) => {
      if (err.code) {
        console.error(`failed to load the content, error: ${JSON.stringify(err)}`);
        return;
      }
      console.info(`Succeeded in loading the content, data: ${JSON.stringify(data)}`);
    });
  }
}