HarmonyOS鸿蒙Next中如何屏蔽小艺悬浮窗防止考试作弊，disableSystemServiceMenuItems无法禁掉系统级浮窗

【背景知识】

• on(‘windowEvent’)：可通过on(‘windowEvent’)监听窗口的生命周期变化。

【解决方案】

可通过on(‘windowEvent’)监听窗口的生命周期变化，其返回值2为获焦，值为3时为失焦状态。应用被其他窗口遮挡或者覆盖导致的失焦，都可以进行监听处理。

import { UIAbility } from '@kit.AbilityKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { window } from '@kit.ArkUI';
import { BusinessError } from '@ohos.base';

const DOMAIN = 0x0000;

export default class EntryAbility extends UIAbility {
  onDestroy(): void {
    hilog.info(DOMAIN, 'testTag', '%{public}s', 'Ability onDestroy');
  }

  onWindowStageCreate(windowStage: window.WindowStage): void {
    window.getLastWindow(this.context, (err: BusinessError, data) => {
      let windowClass = data;
      windowClass.on('windowEvent', (data) => {
        if (data === 2) {
          
        } else if (data === 3) {
          
        }
      });
    });
    AppStorage.setOrCreate('windowStage', windowStage);
    windowStage.loadContent('pages/Index', (err) => {
      if (err.code) {
        hilog.error(DOMAIN, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err));
        return;
      }
      hilog.info(DOMAIN, 'testTag', 'Succeeded in loading the content.');
    });
  }

  onWindowStageDestroy(): void {
    // Main window is destroyed, release UI related resources
    hilog.info(DOMAIN, 'testTag', '%{public}s', 'Ability onWindowStageDestroy');
  }

  onForeground(): void {
    // Ability has brought to foreground
    hilog.info(DOMAIN, 'testTag', '%{public}s', 'Ability onForeground');
  }

  onBackground(): void {
    // Ability has back to background
    hilog.info(DOMAIN, 'testTag', '%{public}s', 'Ability onBackground');
  }
};