HarmonyOS 鸿蒙Next rdb数据库传递给卡片数据的问题

楼主这里只是说了你在查询数据库的时候数据并未存入localStorage，localStorage是页面级存储，所以WidgetCard获取不到数据库的第一条数据。具体方案可以采取用户首选项，先写一个CardManager类封装一下Preferences，创建卡片查询数据库时将查询的数据存储到CardManager，然后再WidgetCard调用CardManager的数据。

参考Demo：

import dataPreferences from '@ohos.data.preferences';
import { formBindingData, formProvider } from '@kit.FormKit';
import EntryContext from '../common/EntryContext'

export class FormDataClass {
  title: string = '卡片标题'
  data: string[] = ['数据1', '数据2', '数据3']
}

export class CardManager {
  static instance: CardManager = new CardManager()

  static get(): CardManager {
    return CardManager.instance
  }

  static KEY_CARD_ID = "card_id"
  static KEY_CARD_INFO = "card_info"

  saveCardId(context: Context, formId: string) {
    let pref = dataPreferences.getPreferencesSync(context, { name: CardManager.KEY_CARD_ID });
    pref.putSync(CardManager.KEY_CARD_ID, formId)
    pref.flush()
  }

  clearCardId(context: Context) {
    let pref = dataPreferences.getPreferencesSync(context, { name: CardManager.KEY_CARD_ID });
    pref.putSync(CardManager.KEY_CARD_ID, '')
    pref.flush()
  }

  getFormId(context: Context): string {
    let pref = dataPreferences.getPreferencesSync(context, { name: CardManager.KEY_CARD_ID });
    let cardId = pref.getSync(CardManager.KEY_CARD_ID, '') as string
    return cardId
  }

  saveCardInfo(context: Context, info: FormDataClass) {
    let pref = dataPreferences.getPreferencesSync(context, { name: CardManager.KEY_CARD_INFO });
    pref.putSync(CardManager.KEY_CARD_INFO, info)
    pref.flush()
  }

  updateCard(context?: Context, formId?: string) {
    if (!context) {
      context = EntryContext.getContext() as Context
    }
    if (!formId) {
      formId = this.getFormId(context)
    }

    console.log('formIdformId', formId)

    if (formId) {
      let pref = dataPreferences.getPreferencesSync(context, { name: CardManager.KEY_CARD_INFO })
      let cardInfo = pref.getSync(CardManager.KEY_CARD_INFO, {}) as FormDataClass
      console.log('cardInfo', cardInfo)
      let dataClass = new FormDataClass()
      dataClass.title = cardInfo.title
      dataClass.data = cardInfo.data
      formProvider.updateForm(formId, formBindingData.createFormBindingData(dataClass))
      this.saveCardId(context, formId)
    }
  }
}

export default class EntryFormAbility extends FormExtensionAbility {
  onAddForm(want: Want) {
    // Called to return a FormBindingData object.
    let formId: string = ''
    if (want?.parameters) {
      formId = want.parameters[formInfo.FormParam.IDENTITY_KEY] as string
      if (formId) {
        CardManager.get().saveCardId(this.context, formId)
      }
    }
    let formData = new FormDataClass();
    setTimeout(() => {
      CardManager.get().updateCard(this.context, formId)
    }, 500)

    return formBindingData.createFormBindingData(formData);
  }
}

你意思是查询数据库后，UI组件未正常刷新吗？onAddForm里面获取的数据并未存储到localStorage，试试这样改下

onAddForm(want: Want) {
  RdbUtils.queryAll((result:TaskItemModel[]) => {
    let taskName=result[0].taskName
    localStorage.set('taskName', taskName)
    return formBindingData.createFormBindingData(taskName);
  });
}

localStorage.set报错了，

![图片](https://example.com/image.png)