[SOLVED] Flutter: Not showing “Open for editing in Android Studio”

Problem

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, v1.7.8+hotfix.4, on Mac OS X 10.14.5 18F132, locale en-IN)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
[!] iOS tools - develop for iOS devices
 ✗ libimobiledevice and ideviceinstaller are not installed. To install with Brew, run:
    brew update
    brew install --HEAD usbmuxd
    brew link usbmuxd
    brew install --HEAD libimobiledevice
    brew install ideviceinstaller
[✓] Android Studio (version 3.1)
[!] VS Code (version 1.42.1)
✗ Flutter extension not installed; install from
https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[✓] Connected device (1 available)
! Doctor found issues in 2 categories.

Solution

The problem is caused by missing .iml project files. These files are added automatically to the .gitignore file but they should not. To fix it:

Delete .idea folder.
Create a new temporary Flutter project with the same name.
Copy from the project to your existing project these 2 missing files:

[project_name].iml
android/[project_name]_android.iml

Open Android Studio and the problem should be gone.