HarmonyOS 鸿蒙Next可以监听切屏获取当前的截屏照片吗

鸿蒙可以监听切屏获取当前的截屏照片，首先要分成2步，

第一步是打开监听截屏的功能，参考:https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/screenproperty-guideline-V5#监听屏幕状态变化

第二步是监听到截屏后获取截屏内容，参考:https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-window-V5#snapshot9-1

最后，写了个简单的demo：

import { display, window } from '@kit.ArkUI';
import { BusinessError, Callback } from '@kit.BasicServicesKit';
import { image } from '@kit.ImageKit';
import { common } from '@kit.AbilityKit';

@Entry
@Component
struct DisplayDemo {
  context: common.UIAbilityContext = getContext(this) as common.UIAbilityContext;

  aboutToAppear(): void {
    this.display()
  }

  build() {
    Column() {
      Button("click to generate UI snapshot")
        .onClick(() => {

        }).margin(10)
    }
    .width('100%')
    .height('100%')
    .alignItems(HorizontalAlign.Center)
  }

  display() {
    let callback2: Callback<boolean> = async (captureStatus: boolean) => {
      console.info('Listening capture status: ' + captureStatus);
      if (captureStatus) {
        let windowClass = await window.getLastWindow(this.context);
        let promise = windowClass.snapshot();
        promise.then((pixelMap: image.PixelMap) => {
          console.info('Succeeded in snapshotting window. Pixel bytes number: ' + pixelMap.getPixelBytesNumber());
          pixelMap.release(); // PixelMap使用完后及时释放内存
        }).catch((err: BusinessError) => {
          console.error(`Failed to snapshot window. Cause code: ${err.code}, message: ${err.message}`);
        });
      }
    };
    // 此处以监听显示设备的增加为例
    display.on('captureStatusChange', callback2);
  }
}