dart

问题 I tried some code but getting an exception. The Exception that I'm getting: java.lang.IllegalArgumentException: Invalid document reference. Document references must have an even number of segments, but Users has 1 I searched for it, according to this, Document references must have an even number of segments like: Collection - document - Collection - document - Collection - document Query for getting data from firestore: String getIsNewUSer; Firestore.instance.collection('Users').document(uid)

问题 I want to create switch/toggle widget in Flutter/Dart with native looks of different OS. I mean if I run on iOS mobile it should be looks like: If I run on Android mobile it should be looks like : Help me to achieve this type of functionality in flutter/dart 回答1: Use Switch.adaptive Creates a CupertinoSwitch if the target platform is iOS, creates a material design switch otherwise. Switch.adaptive(value: true, onChanged: (newValue) {}) Sample code: bool _value = true; @override Widget build

问题 I want to create switch/toggle widget in Flutter/Dart with native looks of different OS. I mean if I run on iOS mobile it should be looks like: If I run on Android mobile it should be looks like : Help me to achieve this type of functionality in flutter/dart 回答1: Use Switch.adaptive Creates a CupertinoSwitch if the target platform is iOS, creates a material design switch otherwise. Switch.adaptive(value: true, onChanged: (newValue) {}) Sample code: bool _value = true; @override Widget build

问题 I have this code that I can't get to work properly. I have a Food class and I have initialized the name, price, and unique ID strings on it. I made the unique ID to be Uuid().v4(), which would give each food item a random string. FOOD CLASS class Food { String name; String price; String uniqueID = Uuid().v4(); Food({this.name, this.price, this.uniqueID})} On another page I have a Provider function that would add items in the cart, it is a list of string items (this may not be the best option)

问题 I have a SingleChildScrollView . Sometimes its child is longer than the screen, in which case the SingleChildScrollView lets you scroll. But also sometimes its child is shorter than the screen, in which case no scrolling is needed. I am trying to add an arrow to the bottom of the screen which hints to the user that they can/should scroll down to see the rest of the contents. I successfully implemented this except in the case where the child of the SingleChildScrollView is shorter than the

问题 I am already having encryption code in java. Now I want to consume APIs from my server. Even after trying various tutorials and sample codes I am not able to successfully decrypt the hash. I know fixed salt and IV is not recommended at all. But for simplicity and to understand the issue I have kept salt and IV to "00000000000000000000000000000000"; Hash After Encryption from Java = "XjxCg0KK0ZDWa4XMFhykIw=="; Private key used = "Mayur12354673645" Can someone please help me to decrypt above

问题 I have a problem with using the BloC pattern in combination with showing a download process using Dio. Can anybody tell me, how to get the onUploadProgress from dio into a bloc state and display it when the progress inside the state updates? At the moment I have the UI, the BloC and an API class. I need to pass my bloc into the API call to download a file and then add an extra event like so: onReceiveProgress: (int received, int total) => { bloc.add(DownloadingImages((received / total) * 100)

问题 I need to wrap SDK created in native code iOS/Android into Flutter. On Android side there is some functionality where my Fragment or Activity needs to extend SDK Fragment or Activity to implement custom view. My question is how I can wrap SDK Fragment or Activity in Flutter plugin and let extends this on flutter project side using my plugin ? I other words I would like to have a Widget which can extend Fragment or Activity using my plugin to have ability to show Widget ui in SDK . Using

问题 I need to wrap SDK created in native code iOS/Android into Flutter. On Android side there is some functionality where my Fragment or Activity needs to extend SDK Fragment or Activity to implement custom view. My question is how I can wrap SDK Fragment or Activity in Flutter plugin and let extends this on flutter project side using my plugin ? I other words I would like to have a Widget which can extend Fragment or Activity using my plugin to have ability to show Widget ui in SDK . Using

问题 I need to wrap SDK created in native code iOS/Android into Flutter. On Android side there is some functionality where my Fragment or Activity needs to extend SDK Fragment or Activity to implement custom view. My question is how I can wrap SDK Fragment or Activity in Flutter plugin and let extends this on flutter project side using my plugin ? I other words I would like to have a Widget which can extend Fragment or Activity using my plugin to have ability to show Widget ui in SDK . Using