如何截取当前widget的屏幕截图并保存在gallery- Flutter中

dependencies:
  screenshot: ^0.3.1

import 'package:screenshot/screenshot.dart';

ScreenshotController screenshotController = ScreenshotController();

@override
Widget build(BuildContext context) {
  return Screenshot(
    controller: screenshotController,
    child: // 需要截屏的widget
  );
}

import 'package:image_gallery_saver/image_gallery_saver.dart';

void saveScreenshot() async {
  RenderRepaintBoundary boundary = screenshotController
      .capture(); // 获取当前widget的截屏图像

  final image = await boundary.toImage();
  ByteData byteData = await image.toByteData(format: ImageByteFormat.png);
  Uint8List pngBytes = byteData.buffer.asUint8List();

  // 保存图片到相册
  final result = await ImageGallerySaver.saveImage(
    Uint8List.fromList(pngBytes),
    quality: 60,
    name: "screenshot",
  );

  if (result['isSuccess']) {
    print("截图保存成功");
  } else {
    print("截图保存失败");
  }
}

FloatingActionButton(
  onPressed: () {
    saveScreenshot();
  },
  child: Icon(Icons.camera),
)