HarmonyOS 使用ShareController组件进行分享 分享出去的文件是0B

import { systemShare } from '@kit.ShareKit'; 
import { uniformTypeDescriptor as utd } from '@kit.ArkData'; 
 
const uri =  getContext().getApplicationContext().filesDir + '/xxx.json' 
const uri1 = 'file://' + getContext().getApplicationContext().filesDir + '/xxx.json' 
const uri2 =  'file://' +  getContext().applicationInfo.name + '/'  + getContext().getApplicationContext().filesDir + '/xxx.json' 
 
let data: systemShare.SharedData = new systemShare.SharedData({ 
  utd: utd.UniformDataType.FILE, 
  uri: uri 
}); 
 
let controller: systemShare.ShareController = new systemShare.ShareController(data); 
let context = getContext() as common.UIAbilityContext; 
controller.show(context, { 
  previewMode: systemShare.SharePreviewMode.DETAIL, 
  selectionMode: systemShare.SelectionMode.SINGLE 
});