鸿蒙卡片传值app到卡片

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WidgetCard.ets

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@Entry
@Component
struct WidgetCard {
  @State num: number = 0

  @LocalStorageProp('formId')
  @Watch('updataFormId')
  formId:string=''

  updataFormId(){
    // 卡片向app传参
    postCardAction(this, {
      action: 'call',
      abilityName: 'EntryAbility',
      params:{
        method:'updataFormId',
        num:this.formId
      }
    });
  }

  build() {
    Row() {
      Column() {

        Text('ID:'+this.formId)

        Button(this.num + '++').onClick(() => {
          this.num++
          postCardAction(this, {
            action: 'call',
            abilityName: 'EntryAbility',
            params:{
              method:'updataNum',
              num:this.num
            }
          });
        })
      }.width('100%')
    }
    .height('100%')
    .onClick(() => {
      postCardAction(this, {
        action: 'router', //跳转事件
        abilityName: 'EntryAbility',

      });
    })
  }
}

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export default class EntryFormAbility extends FormExtensionAbility {
  onAddForm(want: Want) {
    // Called to return a FormBindingData object.
    let formData = '';
    return formBindingData.createFormBindingData({
      // form id
      formId:want.parameters!['ohos.extra.param.key.form_identity']as string
    });
  }

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class Params implements rpc.Parcelable{
  marshalling(dataOut: rpc.MessageSequence): boolean {
    return true
  }

  unmarshalling(dataIn: rpc.MessageSequence): boolean {
    return true
  }

}

class CaraParam{
  num:number=0
  formId:string=''
}

export default class EntryAbility extends UIAbility {
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate');

    this.callee.on('updataNum',(data)=>{
      let res=JSON.parse(data.readString())as CaraParam
      AppStorage.setOrCreate('num',res.num)
      return new Params()
    })

    // 卡片创建时，调用了updataFormId，此时这里就会被触发，然后app将值传过去
    this.callee.on('updataFormId',(data)=>{
      let res=JSON.parse(data.readString())as CaraParam
      // AppStorage.setOrCreate('num',res.formId)
      // 数据可以写到首选项中存储

      // 把最新的数据推过去
      formProvider.updateForm(res.formId,formBindingData.createFormBindingData({
        num:AppStorage.get('num')
      }))
      return new Params()
    })
  }