我正在尝试创建一个flutter应用程序。我已经成功地与Facebook和Twitter的登录工作。我尝试用Twitter登录时出现问题。我的设备还没有安装在twitter应用程序上,我面临着分配空值的问题。有没有人能帮我解决这个问题。
E/flutter (20681): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The getter 'token' was called on null.
E/flutter (20681): Receiver: n
下面是我的终端错误: 错误:在Object.throw_ as throw at MethodChannel._invokeMethod (http://localhost:62884/packages/flutter/src/services/platform_channel.dart.lib.js:409:21) at _invokeMethod.next () at http://localhost:62884/dart_sdk.js:37175:33 at _RootZone.runUnary (http://localhost:62884/dart_sdk.js:37029:58)
我不能将图像作为背景文件上传到容器中,我已经将图像添加到as文件夹中,并将其添加到pubspec.yaml中,并向我显示了该错误:
I/flutter ( 6664): ══╡ EXCEPTION CAUGHT BY IMAGE RESOURCE SERVICE ╞════════════════════════════════════════════════════
I/flutter ( 6664): The following assertion was thrown resolving an image codec:
I/flutter ( 6664): Unable to load
我不能将图像作为背景上传到堆栈中,我已经将图像添加到as文件夹中,并将其添加到pubspec.yaml中,并向我显示了该错误:
Exception caught by image resource service.
The following assertion was thrown resolving an image codec:
Unable to load asset: assets/images/rose.jpg
When the exception was thrown, this was the stack:
#0 PlatformAssetBundle.load (
如果答案是简单的话,我将不胜感激。我是个初学者。
以下是我的完整项目代码:
我的错误是:
E/flutter (17497): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: type 'Null' is not a subtype of type 'String'
E/flutter (17497): #0 new Welcome.fromJson (package:getx_5_rest_api/models/product.dart:33:22)
E/flutt
如何在没有任何第三方库的情况下将图片上传到C#中的Twitter API上传端点?我已经尝试了这个问题How to post a tweet on my twitter account using C#中的代码,它工作得很好,但它只是在tweet上发送文本,我知道我必须附加"media_id“参数,但首先我需要将图像上传到twitter,这就是我的问题所在。