MAUI向Flutter通过Intent传值：如何提取传递的文本内容？

一、MAUI端代码修正 #

你当前的MAUI代码中重复设置了Intent的Action，Intent.ActionSend会被后续的"RECEIVE_INTENT_EXAMPLE_ACTION"覆盖，虽目前能唤起应用，但建议只保留自定义Action以避免潜在问题：

public static async Task SendTextToFlutter()
{
    try
    {
        Intent sendIntent = new Intent();
        // 移除重复的Intent.ActionSend，仅保留自定义Action
        sendIntent.SetAction("RECEIVE_INTENT_EXAMPLE_ACTION");
        sendIntent.PutExtra(Intent.ExtraText, "text from MAUI");
        MainActivity.StartActivity(sendIntent);
    }
    catch (Exception ex) { };
}

二、Flutter端提取Intent携带的文本 #

使用receive_intent包时，需要处理冷启动唤起和后台唤起两种场景，同时从Intent的extras中提取传递的文本：

1. 完整代码实现 #

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

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

  @override
  State<YourFlutterPage> createState() => _YourFlutterPageState();
}

class _YourFlutterPageState extends State<YourFlutterPage> {
  String _receivedText = "暂无收到文本";

  @override
  void initState() {
    super.initState();
    _initReceiveIntent();
    _listenToIntentStream();
  }

  // 处理冷启动时的初始Intent
  Future<void> _initReceiveIntent() async {
    try {
      final receivedIntent = await ReceiveIntent.getInitialIntent();
      _extractTextFromIntent(receivedIntent);
    } on PlatformException {
      // 按需处理异常
    }
  }

  // 监听后台运行时的Intent
  void _listenToIntentStream() {
    ReceiveIntent.receivedIntentStream.listen((receivedIntent) {
      _extractTextFromIntent(receivedIntent);
    }, onError: (err) {
      // 按需处理错误
    });
  }

  // 从Intent中提取文本
  void _extractTextFromIntent(ReceivedIntent? intent) {
    if (intent != null && intent.action == "RECEIVE_INTENT_EXAMPLE_ACTION") {
      // 对应MAUI中Intent.ExtraText的系统key
      final text = intent.extras?["android.intent.extra.TEXT"];
      if (text is String) {
        setState(() {
          _receivedText = text;
        });
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("接收MAUI文本")),
      body: Center(child: Text(_receivedText)),
    );
  }
}

2. 关键说明 #

• 冷启动场景：当Flutter应用未运行，通过MAUI的Intent唤起时，getInitialIntent会返回触发启动的Intent，从中提取文本。
• 后台场景：若Flutter应用已在后台运行，需要通过receivedIntentStream监听新的Intent，确保能实时接收MAUI传递的文本。
• 文本提取：MAUI中Intent.ExtraText对应的Android系统key是android.intent.extra.TEXT，直接从Intent的extrasMap中取值即可。

三、验证Intent Filter配置 #

确保Flutter应用的AndroidManifest.xml中已正确配置对应的Intent Filter，匹配自定义Action：

<intent-filter>
  <action android:name="RECEIVE_INTENT_EXAMPLE_ACTION" />
  <category android:name="android.intent.category.DEFAULT" />
</intent-filter>

内容的提问来源于stack exchange，提问作者Ani