Flutter

问题 How do I write a byte array in Dart? I want to implement this function, but it is Java code with byte[] in it. Can it be written in Dart as well? public static byte[] encrypt(byte[] key, byte[] data) throws Exception { try { return performCipher(Cipher.ENCRYPT_MODE, key, data); } catch (Exception e) { throw new Exception(e); } } 回答1: What you are looking for is Uint8List . It is the equivalent of byte[] of Java in Dart. Every single value has an equivalent in another language, so byte[] in a

问题 How do I write a byte array in Dart? I want to implement this function, but it is Java code with byte[] in it. Can it be written in Dart as well? public static byte[] encrypt(byte[] key, byte[] data) throws Exception { try { return performCipher(Cipher.ENCRYPT_MODE, key, data); } catch (Exception e) { throw new Exception(e); } } 回答1: What you are looking for is Uint8List . It is the equivalent of byte[] of Java in Dart. Every single value has an equivalent in another language, so byte[] in a

问题 how to convert String value to Icons value in Flutter, i'm getting Icon value from json as a String. I got following error when i'm tried to Use that value error: The argument type 'String' can't be assigned to the parameter type 'IconData'. (argument_type_not_assignable at [hippo] lib\screens\dynamic_list.dart:71) { "page": 1, "MenuItems": [ { "id": 419701, "icon": "MdiIcons.account", "name": "account" }, { "id": 419702, "icon": "MdiIcons.currencyUsd", "name": "Funds" }, { "id": 419703,

问题 how to convert String value to Icons value in Flutter, i'm getting Icon value from json as a String. I got following error when i'm tried to Use that value error: The argument type 'String' can't be assigned to the parameter type 'IconData'. (argument_type_not_assignable at [hippo] lib\screens\dynamic_list.dart:71) { "page": 1, "MenuItems": [ { "id": 419701, "icon": "MdiIcons.account", "name": "account" }, { "id": 419702, "icon": "MdiIcons.currencyUsd", "name": "Funds" }, { "id": 419703,

问题 I'm using DataTable in my recent app and i need to change the color of the row line or make it invisible (i mean I don't want to my table shows any row line) If anyone knows please help! thanks 回答1: Use Theme widget and overriding the dividerColor as shown below. import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: MyHomePage(), ); } } class MyHomePage extends

问题 when I run flutter doctor, it shows me the following errors: Running flutter doctor... Doctor summary (to see all details, run flutter doctor -v): [?] Flutter (Channel stable, v1.2.1, on Microsoft Windows [Version 10.0.17134.112], locale en-US) [!] Android toolchain - develop for Android devices (Android SDK version 27.0.3) X Flutter requires Android SDK 28 and the Android BuildTools 28.0.3 To update using sdkmanager, run: D:/Tools/sdk\tools\bin\sdkmanager "platforms;android-28" "build-tools

问题 when I "flutter run" Failed to build iOS app Error output from Xcode build: ↳ ** BUILD FAILED ** Xcode's output: ↳ ../../../Desktop/development/flutter/.pub-cache/hosted/pub.dartlang.org/pull_to_refresh-1.6 .4/lib/src/smart_refresher.dart:434:9: Error: No named parameter with the name 'keyboardDismissBehavior'. keyboardDismissBehavior: ^^^^^^^^^^^^^^^^^^^^^^^ ../../../Desktop/development/flutter/packages/flutter/lib/src/widgets/scroll_view.dart:588: 9: Context: Found this candidate, but the

问题 As I have been developing app using Flutter. I came to find that app is heavy in size plus it is using a lot of space as app data and app cache. Is there any way to clear app cache programmatically? Edit: my app's size in release mode is about 7mb and app data is about 11mb. My app opens one site within app and it also streams online radio so it's app data goes on increasing 回答1: You can get the temp folder, and delete files in it. var appDir = (await getTemporaryDirectory()).path; new

问题 So I saw the ReorderableListView demo and saw that they had the "secondary: const Icon(Icons.drag_handle)" but looking at the reorderable_list.dart file, I noticed that the entire list was draggable on LongPressDraggable anyway [line 424]. So how can I explicitly make changes to either the source code or my own, in order to properly make the icon an actual drag handle? CheckboxListTile( key: Key(item.value), isThreeLine: true, value: item.checkState ?? false, onChanged: (bool newValue) {

问题 Is there any lib/package that will help in both platform iOS and Android to share image+text+url on FB, Twitter And Insta? I have been searing for 4 hours but didn't find any result. https://pub.dev/packages/flutter_share_me this package is only for android so. If you have any solution for it please guide me. ~ PS : I don't want to use Share package, I have buttons of FB, Insta and Twitter. When user will click on any one of the button then data should be share on any of the social media and