Flutter share plus：在 WhatsApp 上分享图片和文字

问：

我正在尝试在我的 flutter 应用程序中实现一个功能，以便如果用户按下特定按钮，则应通过邮件、WhatsApp 等共享图像和文本。 我使用了share_plus插件和屏幕截图插件。 到目前为止，当我通过邮件共享它时，我设法让它工作，但是当我尝试通过 WhatsApp 共享图像+文本时，它不起作用。它只会共享文本，并且图像总是丢失。当我删除文本并仅分享图像时，WhatsApp 上的一切都很好。 你能帮帮我吗？非常感谢！

import 'package:flutter/material.dart';
import 'package:share_plus/share_plus.dart';
import 'package:path_provider/path_provider.dart';
import 'dart:typed_data';
import 'package:screenshot/screenshot.dart';
import 'dart:io';
class InfoScreen extends StatelessWidget {
  final controller = ScreenshotController();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Info'),
        flexibleSpace: Container(
          decoration: BoxDecoration(
            gradient: LinearGradient(
                colors: [Color(0xffFBD23E), Color(0xffF6BE03)],
                begin: Alignment.topCenter,
                end: Alignment.bottomCenter),
          ),
        ),
      ),
      body: Container(
        decoration: BoxDecoration(
          gradient: LinearGradient(
              colors: [Color(0xffFEFDFD), Color(0xffBDBDB2)],
              begin: Alignment.topLeft,
              end: Alignment.bottomRight),
        ),
        child: Column(
          children: <Widget>[
ButtonTheme(
              minWidth: 10000,
              height: 45,
              child: Padding(
                padding: EdgeInsets.fromLTRB(15, 2, 15, 15),
                child: Align(
                  alignment: Alignment.topCenter,
                  child: RaisedButton(
                    onPressed: () async {
                      final image = await controller
                          .captureFromWidget(buildImageStartseite());
                      saveAndShare(image);
                    },
                    color: Colors.white,
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.only(
                        bottomLeft: Radius.circular(12.0),
                        bottomRight: Radius.circular(12.0),
                      ),
                    ),
                    highlightColor: Color(0xffB4B4B3),
                    splashColor: Colors.transparent,
                    child: Text(
                      'Press to share',
                      textAlign: TextAlign.center,
                      style: TextStyle(fontSize: 17, color: Color(0xff232323)),
                    ),
                  ),
                ),
              ),
            ),
],
        ),
      ),
    );
  }


  Future saveAndShare(Uint8List bytes) async {
    final directory = await getApplicationDocumentsDirectory();
    final image = File('${directory.path}/Shared_picture.png');
    image.writeAsBytesSync(bytes);
    final text =
        'I'm sharing this with you!';
    await Share.shareFiles([image.path], text: text);
  }
}