HarmonyOS 鸿蒙Next如何设置应用内悬浮窗，通过创建子窗口方式，但子窗口加载的页面都是空白

看下此demo是否满足：

//FloatWindow.ets
// 引入window类
import window from '[@ohos](/user/ohos).window';
import { BusinessError } from '[@ohos](/user/ohos).base';
import router from '[@ohos](/user/ohos).router';

[@Entry](/user/Entry)
[@Component](/user/Component)
struct FloatWindow {
 // 定义windowClass变量，用来接收创建的悬浮窗
 // 自定义创建悬浮窗方法
 createFloatWindow() {
   // 窗口类型设置为window.WindowType.TYPE_FLOAT
   let windowStage = AppStorage.get("windowStage") as window.WindowStage;

   // let config:window.Configuration = {name: "floatWindow", windowType: window.WindowType.TYPE_FLOAT, ctx: getContext(this)};
   // 创建悬浮窗
   windowStage.createSubWindow("floatWindow", (err, win) => {

     if (err.code) {
       console.error('Failed to create the floatWindow. Cause: ' + JSON.stringify(err));
       return;
     }
     console.info('Succeeded in creating the floatWindow. Data: ' + JSON.stringify(win));

     // 设置悬浮窗位置
     win.moveWindowTo(300, 300, (err) => {
       if (err.code) {
         console.error('Failed to move the window. Cause:' + JSON.stringify(err));
         return;
       }
       console.info('Succeeded in moving the window.');
     });
     // 设置悬浮窗大小
     win.resize(700, 200, (err) => {
       if (err.code) {
         console.error('Failed to change the window size. Cause:' + JSON.stringify(err));
         return;
       }
       console.info('Succeeded in changing the window size.');
     });
     // 为悬浮窗加载页面内容，这里可以设置在main_pages.json中配置的页面
     win.setUIContent("pages/FloatContent", (err: BusinessError) => {
       if (err.code) {
         console.error('Failed to load the content. Cause:' + JSON.stringify(err));
         return;
       }
       win.setWindowBackgroundColor("#00000000")
       console.info('Succeeded in loading the content.');
       // 显示悬浮窗。
       win.showWindow((err: BusinessError) => {
         if (err.code) {
           console.error('Failed to show the window. Cause: ' + JSON.stringify(err));
           return;
         }
         console.info('Succeeded in showing the window.');
       });
     });
   });
 }
}