ArkTS语言HarmonyOS/OpenHarmony应用开发-message事件刷新卡片内容

• 开发过程

在卡片页面中可以通过postCardAction接口触发message事件拉起FormExtensionAbility，然后由FormExtensionAbility刷新卡片内容。

 

common：公共文件

通过点击button按钮，刷新卡片内容。代码示例：

WidgetCard.ets

let storage = new LocalStorage(); @Entry(storage) @Component struct WidgetCard {   @LocalStorageProp('title') title: string = 'title';   @LocalStorageProp('content') detail: string = 'content';   @LocalStorageProp('img') img: string = '/common/img/1.jpg';   build() {     Column() {       Image(this.img).width(50).height(50)       Text(`${this.title}`)       Text(`${this.detail}`)       Button('刷新').type(ButtonType.Capsule).height(20).margin({top:10})         .onClick(() => {           postCardAction(this, {             'action': 'message',             'params': {               'msg': 'refresh'             }           });         })     }     .width('100%')     .height('100%')     .justifyContent(FlexAlign.Center)     .alignItems(HorizontalAlign.Center)   } }

在onFormEvent中主动刷新

EntryFormAbility.ts

import formInfo from '@ohos.app.form.formInfo';
import formBindingData from '@ohos.app.form.formBindingData';
import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';
import formProvider from '@ohos.app.form.formProvider';


export default class EntryFormAbility extends FormExtensionAbility {
  onAddForm(want) {
    // Called to return a FormBindingData object.
    let formData = {};
    return formBindingData.createFormBindingData(formData);
  }

  onCastToNormalForm(formId) {
    // Called when the form provider is notified that a temporary form is successfully
    // converted to a normal form.
  }

  onUpdateForm(formId) {
    // Called to notify the form provider to update a specified form.
  }

  onChangeFormVisibility(newStatus) {
    // Called when the form provider receives form events from the system.
  }

  onFormEvent(formId, message) {
    // Called when a specified message event defined by the form provider is triggered.
    let formData = {
      'title': '标题',
      'content': '内容',
      'img': '/common/img/2.jpg',
    };
    let formInfo = formBindingData.createFormBindingData(formData)
    formProvider.updateForm(formId, formInfo).then((data) => {
      console.info('FormAbility updateForm success.' + JSON.stringify(data));
    }).catch((error) => {
      console.error('FormAbility updateForm failed: ' + JSON.stringify(error));
    })
  }

  onRemoveForm(formId) {
    // Called to notify the form provider that a specified form has been destroyed.
  }

  onAcquireFormState(want) {
    // Called to return a {@link FormState} object.
    return formInfo.FormState.READY;
  }
};

 

案例效果：

打开模拟器

添加卡片至桌面