flutter doctor

Read the flutter doctor output and fix missing dependencies.

The flutter doctor command

flutter doctor checks every dependency in your development environment and lists the missing or faulty ones. It inspects Android Studio, Xcode, VS Code, connected devices and the license status. It is the first command to run after a fresh install.

$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.24.0)
[✓] Chrome - develop for the web
[!] Android toolchain - some issues
[✓] VS Code

Missing dependencies

Doctor warnings usually come from missing Android Studio, Android SDK or Xcode. On Linux and Windows installing Android Studio fixes most Android dependencies; on macOS Xcode is required to build for iOS. flutter doctor --android-licenses accepts the Android licenses.

# Accept licenses
flutter doctor --android-licenses

# Verbose output
flutter doctor -v

Exercise Print a doctor summary

In main, print two lines with print: [OK] Flutter and [OK] Android Studio.

Show example solution

void main() {
  print('[OK] Flutter');
  print('[OK] Android Studio');
}

Test yourself

What does the [!] mark in flutter doctor output mean?
- The tool is installed and ready
- The tool is installed but has an issue that needs attention
- The license was accepted
- The tool was not found
Show answer

The tool is installed but has an issue that needs attention — [✓] means ready, [!] means issue, [✗] means not found.

Accept Android licenses

flutter doctor ____

Show answer

flutter doctor --android-licenses

Doctor output

[✓]

Tool is ready
[!]

Tool installed but has issues
[✗]

Tool not found
Android Studio

For Android dependencies

Next lesson: Summary - Flutter setup

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