我試圖把json數據放入一個變量中。當我打印jsondata時,爲什麼會變爲NULL? 當我更改jsondata打印似乎工作正常,當我使用類型命令它確認它作爲一個列表。那麼當我傳遞給變量時,我做錯了什麼? HttpRequest.getString('file.json').then(
(result) => print(JSON.decode(result))); //this prints f
我收到以下錯誤,同時試圖從我的for循環元素添加到我的List ... NoSuchMethodError: The method 'addAll' was called on null.
Receiver: null
Tried calling: addAll("LrWr826cd3Y")
這裏是我的代碼... Future getData() async {
當我嘗試添加firebase_auth,並運行flutter packages get我得到了我下面的錯誤 Running "flutter packages get" in demo...
demo firebase_auth has no versions that match >=0.2.3 <0.3.0 derived from:
- demo depends on version ^
當我看到我的$ HOME /的.pub緩存/ bin中可執行正常的模板是: #!/usr/bin/env sh
# This file was created by pub v1.24.2.
# Package: <package>
# Version: <package_version>
# Executable: <package>
# Script: <package>
pub
我學習Ruby和我建立了一個這樣的控制器: class Mobile::HomeController < ApplicationController
def index
end
def create
end
end
這是非常基本的,並增加了這樣的路線: scope :module => :mobile, :as => :mobile do