Appareil non applicable pour la configuration "main.Dart",
J'utilise Android Studio comme mon IDE dans le codage Flutter. J'ai pu créer 2 projets avant cela et cela fonctionnait parfaitement. J'ai dû cloner un dépôt) à partir de Github. Le IDE dit pour obtenir la configuration. Je l'ai fait alors c'est arrivé. 
J'ai déjà installé sdk.
Mon Android Android est 7.0 
Résultat Flutter Doctor:
[√] Flutter (Channel stable, v1.12.13+hotfix.8, on Microsoft Windows [Version 10.0.18363.720], locale en-US)
• Flutter version 1.12.13+hotfix.8 at C:\src\flutter\flutter
• Framework revision 0b8abb4724 (6 weeks ago), 2020-02-11 11:44:36 -0800
• Engine revision e1e6ced81d
• Dart version 2.7.0
[X] Android toolchain - develop for Android devices
X Unable to locate Android SDK.
Install Android Studio from: https://developer.Android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/setup/#Android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, set Android_HOME to that location.
You may also want to add it to your PATH environment variable.
[√] Android Studio (version 3.6)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 44.0.2
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
[!] Android Studio
• Android Studio at C:\Program
X Flutter plugin not installed; this adds Flutter specific functionality.
X Dart plugin not installed; this adds Dart specific functionality.
X Android-studio-dir = C:\Program
X Android Studio not found at C:\Program
• Try updating or re-installing Android Studio.
• Consider removing your Android-studio-dir setting by running:
flutter config --Android-studio-dir=
[!] VS Code
• VS Code at C:\Users\Tamim Mostafa\AppData\Local\Programs\Microsoft VS Code
X Flutter extension not installed; install from
https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[!] Connected device
! No devices available
! Doctor found issues in 4 categories.
J'ai également essayé de changer le répertoire en utilisant un dossier sans espace blanc. J'ai déplacé le dossier Sdk vers D:\Android\Sdk. flutter doctor -v:
[√] Flutter (Channel stable, v1.12.13+hotfix.8, on Microsoft Windows [Version 10.0.18363.720], locale en-US)
• Flutter version 1.12.13+hotfix.8 at C:\src\flutter\flutter
• Framework revision 0b8abb4724 (6 weeks ago), 2020-02-11 11:44:36 -0800
• Engine revision e1e6ced81d
• Dart version 2.7.0
[X] Android toolchain - develop for Android devices
X Android_HOME = D:\Android\Sdk
but Android SDK not found at this location.
[√] Android Studio (version 3.6)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 44.0.2
• Dart plugin version 192.7761
• Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
[!] Android Studio
• Android Studio at C:\Program
X Flutter plugin not installed; this adds Flutter specific functionality.
X Dart plugin not installed; this adds Dart specific functionality.
X Android-studio-dir = C:\Program
X Android Studio not found at C:\Program
• Try updating or re-installing Android Studio.
• Consider removing your Android-studio-dir setting by running:
flutter config --Android-studio-dir=
[!] VS Code
• VS Code at C:\Users\Tamim Mostafa\AppData\Local\Programs\Microsoft VS Code
X Flutter extension not installed; install from
https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[!] Connected device
! No devices available
! Doctor found issues in 4 categories.
Allez dans Outils> Gestionnaire SDK> Outils SDK et vérifiez le pilote USB Google. Redémarrez Android Studio. Tout cela a fonctionné pour moi, pourrait être utile à quelqu'un.