通过router或call事件刷新卡片内容

在卡片页面中可以通过postCardAction接口触发router事件或者call事件拉起UIAbility，然后由UIAbility刷新卡片内容，下面是这种刷新方式的简单示例。

说明：

本文主要介绍动态卡片的事件开发。对于静态卡片，请参见FormLink。

通过router事件刷新卡片内容

在卡片页面通过注册Button的onClick点击事件回调，并在回调中调用postCardAction接口触发router事件拉起UIAbility。

let storage = new LocalStorage();
@Entry(storage)
@Component
struct WidgetCard {
  @LocalStorageProp('detail') detail: string = 'init';

  build() {
    Column() {
      Button('跳转')
        .margin('20%')
        .onClick(() => {
          console.info('postCardAction to EntryAbility');
          postCardAction(this, {
            action: 'router',
            abilityName: 'EntryAbility', // 只能跳转到当前应用下的UIAbility
            params: {
              detail: 'RouterFromCard'
            }
          });
        })
      Text(`${this.detail}`).margin('20%')
    }
    .width('100%')
    .height('100%')
  }
}

在UIAbility的onCreate()或者onNewWant()生命周期中可以通过入参want获取卡片的formID和传递过来的参数信息，然后调用updateForm接口刷新卡片。

import UIAbility from '@ohos.app.ability.UIAbility';
import formBindingData from '@ohos.app.form.formBindingData';
import formProvider from '@ohos.app.form.formProvider';
import formInfo from '@ohos.app.form.formInfo';
import AbilityConstant from '@ohos.app.ability.AbilityConstant';
import Want from '@ohos.app.ability.Want';
import Base from '@ohos.base'

export default class EntryAbility extends UIAbility {
  // 如果UIAbility第一次启动，在收到Router事件后会触发onCreate生命周期回调
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam) {
    this.handleFormRouterEvent(want);
  }

  handleFormRouterEvent(want: Want) {
    console.info('Want:' + JSON.stringify(want));
    if (want.parameters && want.parameters[formInfo.FormParam.IDENTITY_KEY] !== undefined) {
      let curFormId = want.parameters[formInfo.FormParam.IDENTITY_KEY].toString();
      let message: string = JSON.parse(want.parameters.params.toString()).detail;
      console.info(`UpdateForm formId: ${curFormId}, message: ${message}`);
      let formData: Record<string, string> = {
        "detail": message + ': UIAbility.', // 和卡片布局中对应
      };
      let formMsg = formBindingData.createFormBindingData(formData)
      formProvider.updateForm(curFormId, formMsg).then((data) => {
        console.info('updateForm success.' + JSON.stringify(data));
      }).catch((error: Base.BusinessError) => {
        console.error('updateForm failed:' + JSON.stringify(error));
      })
    }
  }
  // 如果UIAbility已在后台运行，在收到Router事件后会触发onNewWant生命周期回调
  onNewWant(want: Want, launchParam: AbilityConstant.LaunchParam) {
    console.info('onNewWant Want:' + JSON.stringify(want));
    if (want.parameters && want.parameters[formInfo.FormParam.IDENTITY_KEY] !== undefined) {
      let curFormId = want.parameters[formInfo.FormParam.IDENTITY_KEY].toString();
      let message: string = JSON.parse(want.parameters.params.toString()).detail;
      console.info(`UpdateForm formId: ${curFormId}, message: ${message}`);
      let formData: Record<string, string> = {
        "detail": message + ': onNewWant UIAbility.', // 和卡片布局中对应
      };
      let formMsg = formBindingData.createFormBindingData(formData)
      formProvider.updateForm(curFormId, formMsg).then((data) => {
        console.info('updateForm success.' + JSON.stringify(data));
      }).catch((error: Base.BusinessError) => {
        console.error('updateForm failed:' + JSON.stringify(error));
      })
    }
  }
  
  ...
}

通过call事件刷新卡片内容

在使用postCardAction接口的call事件时，需要在FormExtensionAbility中的onAddForm生命周期回调中更新formId。

import formBindingData from '@ohos.app.form.formBindingData';
import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';
import Want from '@ohos.app.ability.Want';

export default class EntryFormAbility extends FormExtensionAbility {
 onAddForm(want: Want) {
   class DataObj1 {
     formId: string = ""
   }
   let dataObj1 = new DataObj1();
   if (want.parameters && want.parameters["ohos.extra.param.key.form_identity"] != undefined) {
     let formId: string = want.parameters["ohos.extra.param.key.form_identity"].toString();
     dataObj1.formId = formId;
   }
   let obj1 = formBindingData.createFormBindingData(dataObj1);
   return obj1;
 }
 ...
};

在卡片页面通过注册Button的onClick点击事件回调，并在回调中调用postCardAction接口触发call事件拉起UIAbility。

let storage = new LocalStorage();
@Entry(storage)
@Component
struct WidgetCard {
  @LocalStorageProp('detail') detail: string = 'init';
  @LocalStorageProp('formId') formId: string = '0';

  build() {
    Column() {
      Button('拉至后台')
        .margin('20%')
        .onClick(() => {
          console.info('postCardAction to EntryAbility');
          postCardAction(this, {
            action: 'call',
            abilityName: 'EntryAbility', // 只能拉起当前应用下的UIAbility
            params: {
              method: 'funA',
              formId: this.formId,
              detail: 'CallFrom'
            }
          });
        })
      Text(`${this.detail}`).margin('20%')
    }
    .width('100%')
    .height('100%')
  }
}

在UIAbility的onCreate生命周期中监听call事件所需的方法，然后在对应方法中调用updateForm接口刷新卡片。

import UIAbility from '@ohos.app.ability.UIAbility';
import formBindingData from '@ohos.app.form.formBindingData';
import formProvider from '@ohos.app.form.formProvider';
import Want from '@ohos.app.ability.Want';
import Base from '@ohos.base'
import rpc from '@ohos.rpc';
import AbilityConstant from '@ohos.app.ability.AbilityConstant';

const MSG_SEND_METHOD: string = 'funA';

class MyParcelable implements rpc.Parcelable {
  num: number;
  str: string;
  constructor(num: number, str: string) {
    this.num = num;
    this.str = str;
  }
  marshalling(messageSequence: rpc.MessageSequence): boolean {
    messageSequence.writeInt(this.num);
    messageSequence.writeString(this.str);
    return true;
  }
  unmarshalling(messageSequence: rpc.MessageSequence): boolean {
    this.num = messageSequence.readInt();
    this.str = messageSequence.readString();
    return true;
  }
}

// 在收到call事件后会触发callee监听的方法
let FunACall = (data: rpc.MessageSequence) => {
  // 获取call事件中传递的所有参数
  let params: Record<string, string> = JSON.parse(data.readString())
  if (params.formId !== undefined) {
    let curFormId: string = params.formId;
    let message: string = params.detail;
    console.info(`UpdateForm formId: ${curFormId}, message: ${message}`);
    let formData: Record<string, string> = {
      "detail": message
    };
    let formMsg: formBindingData.FormBindingData = formBindingData.createFormBindingData(formData);
    formProvider.updateForm(curFormId, formMsg).then((data) => {
      console.info('updateForm success.' + JSON.stringify(data));
    }).catch((error: Base.BusinessError) => {
      console.error('updateForm failed:' + JSON.stringify(error));
    })
  }
  return new MyParcelable(1, 'aaa');
}

export default class EntryAbility extends UIAbility {
  // 如果UIAbility第一次启动，call事件后会触发onCreate生命周期回调
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam) {
    console.info('Want:' + JSON.stringify(want));
    try {
      // 监听call事件所需的方法
      this.callee.on(MSG_SEND_METHOD, FunACall);
    } catch (error) {
      console.info(`${MSG_SEND_METHOD} register failed with error ${JSON.stringify(error as Base.BusinessError)}`)
    }
  }
}