How share selected text in flutter

I work on reading book app in flutter, i make the text selectable text, but the problem when i want share the selected text, thier is any way to do it ?

I try use onselectionchanged in selectable to capture the selected text but this not work

onselectionchanged should work for you, although it is executed every time the user changes the selection, which I don't think is what you want, the normal thing is to add a button to the context menu with the one you want to share in your case.

use contextMenuBuilder, note: this example use url_launcher for send sms with the text, you need run

flutter pub add url_launcher

example:

import 'package:flutter/material.dart';
import 'package:url_launcher/url_launcher.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Material App',
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Material App Bar'),
        ),
        body: Center(
          child: SelectableText(
            contextMenuBuilder: (context, editableTextState) {
              final TextEditingValue value = editableTextState.textEditingValue;

              // Get text selected
              final textSeleted = value.selection.textInside(value.text);

              // Get button default of text selection
              final List<ContextMenuButtonItem> buttonItems =
                  editableTextState.contextMenuButtonItems;

              // Add new button share
              buttonItems.insert(
                  0,
                  ContextMenuButtonItem(
                    label: 'share',
                    onPressed: () {
                      final Uri smsLaunchUri = Uri(
                        scheme: 'sms',
                        path: '011122355',
                        queryParameters: <String, String>{
                          'body': textSeleted,
                        },
                      );

                      // Launch sms with text selected
                      launchUrl(smsLaunchUri);

                      // Close context menu
                      ContextMenuController.removeAny();
                    },
                  ));

              return AdaptiveTextSelectionToolbar.buttonItems(
                anchors: editableTextState.contextMenuAnchors,
                buttonItems: buttonItems,
              );
            },
            'Hello World text bla bla 123',
          ),
        ),
      ),
    );
  }
}