HarmonyOS 鸿蒙Next如何设置页面防止截屏

参考以下步骤和demo：

1、在module.json5文件中声明需要使用的 ohos.permission.PRIVACY_WINDOW 权限，参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/declare-permissions-V5

"requestPermissions":[
  {
    "name" : "ohos.permission.PRIVACY_WINDOW"
  }
]

2、示例代码：

// windowUtils.ets

import window from '@ohos.window';

import common from '@ohos.app.ability.common';

export class windowUtils {

  static setWindowPrivacyModeInPage(context: common.UIAbilityContext,isFlag: boolean) {

    window.getLastWindow(context).then((lastWindow)=>{
      lastWindow.setWindowPrivacyMode(isFlag);
    })
  }
}

//页面

import common from '@ohos.app.ability.common';

import { windowUtils } from '../common/windowUtils';

@Entry
@Component
struct Index3 {

  @State message: string = 'Hello World';

  onPageShow(): void {
    windowUtils.setWindowPrivacyModeInPage(getContext(this) as common.UIAbilityContext, true);
  }

  onPageHide() {
    windowUtils.setWindowPrivacyModeInPage(getContext(this) as common.UIAbilityContext,false);
  }

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
      }
    }
    .width('100%')
  }
  .height('100%')
}

之前看到一个老哥写的，我试过，是可以的

async function setWindowPrivacyModeTrue(context: common.UIAbilityContext) {
  let windowClass: window.Window = await window.getLastWindow(context)
  try {
    windowClass.setWindowPrivacyMode(true, (err: BusinessError) => {
      const errCode: number = err.code;
      if (errCode) {
        console.error('Failed to set the window to privacy mode. Cause:' + JSON.stringify(err));
        if (errCode == 201) {
          /*
          {
            "module": {
              "requestPermissions": [
                {
                  "name": "ohos.permission.INTERNET"
                }
              ],*/
          promptAction.showToast({
            message: `请在src/main/module.json5添加权限 "name": "ohos.permission.PRIVACY_WINDOW"`,
            duration: 2000,
            bottom: '500lpx'
          });
        }
        return;
      }
      promptAction.showToast({
        message: `已开启 防截屏录屏`,
        duration: 2000,
        bottom: '500lpx'
      });
      console.info('Succeeded in setting the window to privacy mode.');
    });
  } catch (exception) {
    console.error('Failed to set the window to privacy mode. Cause:' + JSON.stringify(exception));
  }
}