在Flutter开发中,点击按钮发送请求之后提示异常信息“Null check operator used on a null value”原因以及解决方法? 1.由于我不知道某一个字段的数据类型,于是申明了一个可为空的字符串如下: String? ud 加⼀个问号可以让静态检查通过,表⽰可空类型。 后台传来这个数据之后(此数据是数字),我直接进行赋值给此...
Greendao 条件查询数据报错 the bind value at index 2 is null 导致报错的方法: xxxDao.queryBuilder...
0 Null check operator used on a null value (error) 0 Bug Null check operator used on a null value in flutter 1 Getting Error Of (Null check operator used on a null value) 0 Flutter: I still get the error "Null check operator used on a null value" on the...
0 Null Check operator used on null value in Dart Flutter 0 Bug Null check operator used on a null value in flutter 2 Null Check Operator used on null value - flutter 3 Null check operator used on a null value in my flutter project 0 Null check operator used on a null value in...
但是如果网络数据响应时间变长,而且快速的进出页面,就会报错Null check operator used on a null value。 具体报错原因:由于快速的进出页面,当数据返回时,get内部已经delete了logic, 然后再重新创建新的 GetBuilder<GetIndexLogic>( builder: (_) {returnListView.builder( ...
上述问题原因,极大概率是传参不匹配,window.defaultRouteName获取的路由参数,缺少导致 仔细比对一下入参是不是原生没有传,xxx参数原生必须要传,否则就会...
[ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Null check operator used on a null value @override void initState() { super.initState(); UserPreferences.init().then((_) { if (UserPreferences.getEmail!.isNotEmpty) { ...
Non-fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: Null check operator used on a null value at State.context(framework.dart:957) at _DashboardPageFABState.openDashboardFabSheet(dashboard_fab.dart:46) This is the simplified code that caused the error: Future<void> open...
Steps to reproduce: Run the following program in the Dart VM: void main() { print(null!); } Result: Unhandled exception: Null check operator used on a null value #0 main (file:///path/to/source_file.dart:2:13) ... I dislike that this err...
每当我在ListViewNull check operator used on a null value The relevant error-causing widget was ListView中使用此自定义小部件时,就会发生此错误。但如果我使用像TextButton()这样的built-in flutter小部件,则列表视图工作正常。 我正在努力寻找问题所在。它有什么问题?