如何实现防截屏功能

setWindowPrivacyMode设置窗口是否为隐私模式，设置为隐私模式的窗口，窗口内容将无法被截屏或录屏。此接口可用于禁止截屏/录屏的场景。

方式一：在onWindowStageCreate回调中设置主窗口为隐私模式，具体可参考示例代码：

import { window } from '@kit.ArkUI'; 
import { BusinessError } from '@kit.BasicServicesKit';
 onWindowStageCreate(windowStage: window.WindowStage): void { 
    // Main window is created, set main page for this ability 
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageCreate'); 
    // 获取主窗口 
    windowStage.getMainWindow((err: BusinessError, data) => { 
      let errCode: number = err.code; 
      if (errCode) { 
        console.error('Failed to obtain the main window. Cause: ' + JSON.stringify(err)); 
        return; 
      } 
      let windowClass: window.Window = data; 
      console.info('Succeeded in obtaining the main window. Data: ' + JSON.stringify(data)); 
      // 设置窗口隐私模式 
      let isPrivacyMode: boolean = true; 
      try { 
        windowClass.setWindowPrivacyMode(isPrivacyMode, (err: BusinessError) => { 
          const errCode: number = err.code; 
          if (errCode) { 
            console.error('Failed to set the window to privacy mode. Cause:' + JSON.stringify(err)); 
            return; 
          } 
          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)); 
      } 
    }) 
    windowStage.loadContent('pages/Index', (err, data) => { 
      if (err.code) { 
        hilog.error(0x0000, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err) ?? ''); 
        return; 
      } 
      hilog.info(0x0000, 'testTag', 'Succeeded in loading the content. Data: %{public}s', JSON.stringify(data) ?? ''); 
    }); 
  }

方式二：进入页面开启隐式模式，离开页面取消，具体可参考以下步骤：

首先在module.json5文件中声明需要使用的ohos.permission.PRIVACY_WINDOW 权限

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

然后在进入页面时触发onPageShow回调，调用setWindowPrivacyMode设置窗口为隐私模式，离开页面时触发onPageHide回调，设置窗口为非隐私模式，参考示例代码如下：

import { BusinessError } from '@kit.BasicServicesKit';
import { common } from '@kit.AbilityKit';
import { window } from '@kit.ArkUI';

class windowUtils {
  static setWindowPrivacyModeInPage(context: common.UIAbilityContext, isFlag: boolean) {
    window.getLastWindow(context).then((lastWindow) => {
      lastWindow.setWindowPrivacyMode(isFlag, (err: BusinessError) => {
        const errCode: number = err.code;
        if (errCode) {
          console.error('Failed to set the window to privacy mode. 1Cause:' + JSON.stringify(err));
          return;
        }
        console.info('Succeeded in setting the window to privacy mode.');
      });
    })
  }
}

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';

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

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

  build() {
    RelativeContainer() {
      Text(this.message)
        .id('HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
    }
    .height('100%')
    .width('100%')
  }
}