多个Ability并适配深浅色模式/系统语言切换

export default class EntryAbility extends UIAbility { 
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void { 
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate'); 
    ContextUtil.mContext = this.context; 
    ContextUtil.mConfiguration = this.context.config; 
  } 
 
  onConfigurationUpdate(newConfig: Configuration): void { 
    ContextUtil.mConfiguration = newConfig; 
  } 
}

@Entry 
@Component 
struct Index { 
  @State darkMode: boolean = ContextUtil.mConfiguration.colorMode == ConfigurationConstant.ColorMode.COLOR_MODE_DARK; 
  build() { 
    Row() { 
      Column() { 
        Row(){ 
          Text($r('app.string.dark_mode')) 
          Toggle({ type: ToggleType.Switch, isOn: this.darkMode }).onChange((isOn:Boolean)=>{ 
            let applicationContext = ContextUtil.mContext.getApplicationContext(); 
            if (this.darkMode) { 
              //设置系统浅色模式。 
              this.darkMode = false; 
              applicationContext.setColorMode(ConfigurationConstant.ColorMode.COLOR_MODE_LIGHT) 
            }else { 
              //设置系统深色模式。 
              this.darkMode = true; 
              applicationContext.setColorMode(ConfigurationConstant.ColorMode.COLOR_MODE_DARK) 
            } 
          }) 
        }.height(200) 
        Text($r('app.string.default_app')) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}