[bugfix] asr unfinished

lib/services/message_service.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:ai_chat_assistant/utils/common_util.dart';
 import 'package:ai_chat_assistant/utils/tts_util.dart';
 import 'package:basic_intl/intl.dart';
@@ -19,14 +21,16 @@ import 'command_service.dart';
 import 'package:fluttertoast/fluttertoast.dart';
 
 class MessageService extends ChangeNotifier {
-  static const MethodChannel _channel = MethodChannel('com.example.ai_chat_assistant/asr');
+  static const MethodChannel _asrChannel = MethodChannel('com.example.ai_chat_assistant/asr');
 
   static final MessageService _instance = MessageService._internal();
 
   factory MessageService() => _instance;
 
+  Completer<String>? _asrCompleter;
+
   MessageService._internal() {
-    _channel.setMethodCallHandler((call) async {
+    _asrChannel.setMethodCallHandler((call) async {
       switch (call.method) {
         case "onAsrResult":
           replaceMessage(id: _latestUserMessageId!, text: call.arguments);
@@ -34,6 +38,10 @@ class MessageService extends ChangeNotifier {
         case "onAsrStop":
           replaceMessage(
               id: _latestUserMessageId!, status: MessageStatus.normal);
+          if (_asrCompleter != null && !_asrCompleter!.isCompleted) {
+            _asrCompleter!.complete(messages.last.text);
+          }
+          break;
       }
     });
   }
@@ -92,7 +100,7 @@ class MessageService extends ChangeNotifier {
       changeState(MessageServiceState.recording);
       addMessage("", true, MessageStatus.listening);
       _latestUserMessageId = messages.last.id;
-      _channel.invokeMethod("start");
+      _asrChannel.invokeMethod("start");
     } catch (e) {
       print('录音开始出错: $e');
     }
@@ -120,8 +128,9 @@ class MessageService extends ChangeNotifier {
     }
     try {
       changeState(MessageServiceState.recognizing);
-      _channel.invokeMethod("stop");
-      final recognizedText = messages.last.text;
+      _asrChannel.invokeMethod("stop");
+      _asrCompleter = Completer<String>();
+      final recognizedText = await _asrCompleter!.future;
       // final audioData = await _audioService.stopRecording();
       // replaceMessage(
       //     id: _latestUserMessageId!,
@@ -144,9 +153,10 @@ class MessageService extends ChangeNotifier {
       changeState(MessageServiceState.replying);
       await reply(recognizedText);
     } catch (e) {
-      // todo
+      print(e);
     } finally {
       changeState(MessageServiceState.idle);
+      _asrCompleter = null;
     }
   }