Flutter:未处理的异常:初始化绑定之前已访问ServicesBinding.defaultBinaryMessenger [英] Flutter: Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized

问题描述

有解决此问题的解决方案吗?

Any solution to solve this problem?

堆栈跟踪:

[VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized.
If you're running an application and need to access the binary messenger before `runApp()` has been called (for example, during plugin initialization), then you need to explicitly call the `WidgetsFlutterBinding.ensureInitialized()` first.
If you're running a test, you can call the `TestWidgetsFlutterBinding.ensureInitialized()` as the first line in your test's `main()` method to initialize the binding.
#0      defaultBinaryMessenger.<anonymous closure> (package:flutter/src/services/binary_messenger.dart:73:7)
#1      defaultBinaryMessenger (package:flutter/src/services/binary_messenger.dart:86:4)
#2      MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:140:62)
#3      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:314:35)
<asynchronous suspension>
#4      MethodChannel.invokeMapMethod (package:f<…>

推荐答案

升级Flutter时会引入此问题. 造成这种情况的原因是您正在等待某些数据或正在main()中运行async函数.

This problem is introduced when you upgrade Flutter. The reason behind this is you are waiting for some data or running an async function inside main().

我正在main()内部初始化ScopedModel，正在等待一些数据.

I was initialising ScopedModel inside main() and inside that I was awaiting for some data.

有一个很小的修复程序. 在执行runApp()之前，只需在void main()内部运行WidgetsFlutterBinding.ensureInitialized().就像魅力一样！！

There is a very small fix. Just run WidgetsFlutterBinding.ensureInitialized() inside void main() , before you do runApp(). Works like a charm!!

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(Delta(
    model: ProductDataModel(),
  ));
}

这篇关于Flutter:未处理的异常:初始化绑定之前已访问ServicesBinding.defaultBinaryMessenger的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！