1

flutter_app/lib/reminder/reminder.dart

@@ -6,7 +6,9 @@ import 'package:vibration/vibration.dart';
 /// 提醒：同类目标 10s 内只提醒一次。
 /// 震动/提示音默认开启，不提供关闭入口。
 class Reminder {
-  final AudioPlayer _player = AudioPlayer();
+  // 惰性创建：AudioPlayer 构造即发起平台初始化（无插件环境下未处理错误会
+  // 泄漏为 unhandled async error），首响时才建
+  AudioPlayer? _player;
   String? _lastAlertLabel;
   int _lastAlertAt = 0;
 
@@ -24,11 +26,12 @@ class Reminder {
   void _vibrate() => Vibration.vibrate(duration: 200);
 
   Future<void> _playTone() async {
-    await _player.stop();
-    await _player.play(AssetSource('beep.wav'));
+    final p = _player ??= AudioPlayer();
+    await p.stop();
+    await p.play(AssetSource('beep.wav'));
   }
 
   void release() {
-    _player.dispose();
+    _player?.dispose();
   }
 }