Basic

flutter doctor

Error: Exception: Bad UTF-8 encoding

Solution: Use the current version of vswhere

Download from: https://github.com/microsoft/vswhere/releases

Store/overwrite: C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe

PS> Set-Location "C:\Program Files (x86)\Microsoft Visual Studio\Installer"                                                                                                                                              
PS> Move-Item vswhere.exe vswhere.exe.original
PS> Invoke-WebRequest https://github.com/microsoft/vswhere/releases/download/3.0.3/vswhere.exe -O vswhere.exe

Null safety features are disabled for this library.

lib/main.dart:8:19: Error: Null safety features are disabled for this library.
Try removing the package language version or setting the language version to 2.12 or higher.
  const MyApp({Key? key}) : super(key: key);

Solution: Edit pubspec.yaml

environment:
  sdk: '>=2.17.3 <3.0.0'

Migration Dart Plugins

import 'package:flutter/services.dart';
client =createHttpClient();

import 'package:http/http.dart' as http;
client = new http.Client();

Your app is not using AndroidX

GoTo Flutter_Project -> android -> gradle.properties file. Open the gradle.properties file in any Text editor.

Add below lines in this file and Save the file.

android.useAndroidX=true
android.enableJetifier=true

Open your Flutter Project Root directory in Command Prompt or Terminal and execute

flutter clean