HarmonyOS 应用开发中的工具类等如何获取 UIAbilityContext ？

onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    try {
      this.context.getApplicationContext().setColorMode(ConfigurationConstant.ColorMode.COLOR_MODE_NOT_SET);
    } catch (err) {
      hilog.error(DOMAIN, 'testTag', 'Failed to set colorMode. Cause: %{public}s', JSON.stringify(err));
    }
    hilog.info(DOMAIN, 'testTag', '%{public}s', 'Ability onCreate');
    // 新加
    AppStorage.setOrCreate('context', this.context);
  }

let context = AppStorage.get('context') as common.UIAbilityContext;