다른 앱으로부터 공유받기 - flutter_sharing_intent

- https://pub.dev/packages/flutter_sharing_intent 사용

- 안드로이드에서는 AndroidManifest.xml에 다음을 추가

<intent-filter>
    <action android:name="android.intent.action.SEND" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:mimeType="text/*" />
</intent-filter>

main.dart

import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter_sharing_intent/flutter_sharing_intent.dart';
import 'package:flutter_sharing_intent/model/sharing_file.dart';

void main() {
  runApp(const MyApp());
}

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  late StreamSubscription _intentDataStreamSubscription;
  List<SharedFile>? list;
  @override
  void initState() {
    super.initState();
    // For sharing images coming from outside the app while the app is in the memory
    _intentDataStreamSubscription = FlutterSharingIntent.instance.getMediaStream()
        .listen((List<SharedFile> value) {
      setState(() {
        list = value;
      });
      print("Shared: getMediaStream ${value.map((f) => f.value).join(",")}");
    }, onError: (err) {
      print("getIntentDataStream error: $err");
    });

    // For sharing images coming from outside the app while the app is closed
    FlutterSharingIntent.instance.getInitialSharing().then((List<SharedFile> value) {
      print("Shared: getInitialMedia ${value.map((f) => f.value).join(",")}");
      setState(() {
        list = value;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          child: Container(
              margin: EdgeInsets.symmetric(horizontal: 24),
              child: Text('Sharing data: \n${list?.join("\n\n")}\n')),
        ),
      ),
    );
  }
  @override
  void dispose() {
    _intentDataStreamSubscription.cancel();
    super.dispose();
  }
}

ios 등 자세한 것은 위의 링크 예제에 주석으로 잘 되어있음.