You need to run the following command in the relevant project folder to generate the platform folders (Android, iOS, Web, etc). Some of the tutorials will have these already included, if needed.
flutter create .
https://pub.dev/publishers/funwith.app/packages
Tip 001 - Stretchy Header [ Video ] [ Code ] - Add a stretchable header to a Flutter application
Adding this to my app, noticed a few changes that have occurred since you wrote this. Thanks!
Launching lib\main.dart on TECNO P703 in debug mode...
FAILURE: Build failed with an exception.
Could not resolve all files for configuration ':path_provider:lintClassPath'. Could not download intellij-core.jar (com.android.tools.external.com-intellij:intellij-core:26.5.0) > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/external/com-intellij/intellij-core/26.5.0/intellij-core-26.5.0.jar'. > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/external/com-intellij/intellij-core/26.5.0/intellij-core-26.5.0.jar'. > dl.google.com Could not download kotlin-compiler.jar (com.android.tools.external.com-intellij:kotlin-compiler:26.5.0) > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/external/com-intellij/kotlin-compiler/26.5.0/kotlin-compiler-26.5.0.jar'. > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/external/com-intellij/kotlin-compiler/26.5.0/kotlin-compiler-26.5.0.jar'. > dl.google.com
Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
Get more help at https://help.gradle.org
BUILD FAILED in 56s Exception: Gradle task assembleDebug failed with exit code 1 Exited (sigterm)
