NoSuchMethodError was thrown building AnnouncementWebView(dirty, state: _AnnouncementWebViewState#d4695):Tried calling: stream 这是我的代码: num _stackToView = 1; We
24353): The following NoSuchMethodError was thrown during a I/flutter (24353): The getter'image' was called on null.I/flutter (24353): Receiver: nullI/flutter (24353): When theStrea
在聊天屏幕上,我需要访问用户uid来检查谁在发送消息,但是我得到了"The getter 'uid‘was called On null.“。我使用bloc模式使用验证器登录。我该如何解决这种情况?_loginBloc.submit : null, })
],<String> get outEmail => _emailController.stream</em
这是错误:未处理的异常: NoSuchMethodError:在null上调用了getter 'host‘。我不知道该怎么处理。简而言之,我收到了错误;
[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception:NoSuchMethodError: The getter'host' was called on null.Receiver:
此错误 The getter 'length' was called on null.Receiver: null
Tried calling: length 当数据加载时,错误将会消失,请帮助我在数据未加载之前我如何使用prorgressbar我正在尝试从api中获取数据当api获取数据时,它在列表userdata变量中传递数据,并调用widget webview问题是,在加载它之前,在加载它之前,在null上调用了</e