```typescript
import UIAbility from '@ohos.app.ability.UIAbility';
import formBindingData from '@ohos.app.form.formBindingData';
import formProvider from '@ohos.app.form.formProvider';
import hilog from '@ohos.hilog';
import Window from '@ohos.window';
import abilityAccessCtrl from '@ohos.abilityAccessCtrl';
import {AGCCloudDB} from'../services/AGCCloudDB'
import {AGCStorageReference} from'../services/Storage'
import request from '@ohos.request';
import fs from '@ohos.file.fs';
export default class EntryAbility extends UIAbility {
onCreate(want, launchParam) {//如果触发call事件时UIAbility未启动，会先执行onCreate再执行监听事件。如果触发Call事件时UIAbility已经在运行中则直接执行监听事件。
this.callee.on('funA',(str)=>{//监听器，检测到对应参数就执行回调函数
let params = JSON.parse(str.readString())
if (params.formId != undefined) {
let formId = params.formId
const agcCloudDB = AGCCloudDB.instance(this.context)
agcCloudDB.init(this.context).then((res) => {
let CloudDB = new AGCStorageReference(this.context)
agcCloudDB.getMovie().then((allRecords) => {//从数据库获取数据组
let radomNumber = Math.floor(Math.random() * allRecords.length) CloudDB.getDownloadUrl(allRecords[radomNumber].movieName).then((url) => {//从数据组中随机抽取一项，获取对应的图片下载链接
let tempDir = this.context.getApplicationContext().tempDir;
let tmpFile = tempDir + '/file' + Date.now();
request.downloadFile(this.context, {//将图片下载到本地，并得到本地的图片地址
url: url, filePath: tmpFile
}).then((task) => {
task.on('complete', function callback() {
console.info('ArkTSCard download complete:' + tmpFile);
let file;
try {
file = fs.openSync(tmpFile);
} catch (e) {
console.error(`openSync failed: ${JSON.stringify(e)}`);
}
console.log(JSON.stringify(allRecords))
let formData = {//进行数据打包
"text": allRecords[radomNumber].movieName,
"imgName": allRecords[radomNumber].movieName,
'formImages': {},
} formData.formImages[allRecords[radomNumber].movieName]=file.fd//由于Image的刷新机制必须接受不同的值才能识别到image变化，因此movieName只能使用变量的形式写入。
let formInfo = formBindingData.createFormBindingData(formData)//创建FormBindingData对象
formProvider.updateForm(formId, formInfo)
})//执行updateForm事件，刷新指定卡片。
task.on('fail', function callBack(err) {//数据准备失败时显示的内容
console.info('ArkTSCard download task failed. Cause:' + err);
let formInfo = formBindingData.createFormBindingData({
'text': '刷新失败,请重试'
})
formProvider.updateForm(formId, formInfo)
})
})
return null
})
})
})
}
})
}
}
```