anchor.diff:  import 'package:flutter/services.dart';
   import 'package:path_provider/path_provider.dart';
   import 'package:rxdart/rxdart.dart';
  -import 'package:rxdart/subjects.dart';
   import 'package:uuid/uuid.dart';
   
   import 'applifecycle.dart';
  
positive.code:     _playerEditor = null;
  
      if (_lifecycleObserver != null) {
        WidgetsBinding.instance?.removeObserver(_lifecycleObserver!);
        _lifecycleObserver = null;
      }
    }
  
negative.code:       }
      });
      if (_lifecycleObserver != null) {
        WidgetsBinding.instance.addObserver(_lifecycleObserver!);
      }
    }
  
  