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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

Practice Print a doctor summary

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

Starter code

main.dart
void main() {
  // iki satır yazdır:
  // [OK] Flutter
  // [OK] Android Studio

}

Sample solution

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

Expected output

[OK] Flutter
[OK] Android Studio

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 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 Correct answer
  • The license was accepted
  • The tool was not found

Explanation: [✓] means ready, [!] means issue, [✗] means not found.

2 Accept Android licenses

Question 
flutter doctor ____
Answer 
flutter doctor --android-licenses

Explanation: flutter doctor --android-licenses accepts all Android SDK licenses one by one.

3 Doctor output

Term Meaning
[✓] Tool is ready
[!] Tool installed but has issues
[✗] Tool not found
Android Studio For Android dependencies

All lessons in Beginner

1 Intro to Flutter

  1. What is Flutter?
  2. Dart and Flutter
  3. SDK and setup
  4. flutter doctor
  5. Summary - Flutter setup

2 First app

  1. flutter create
  2. Project structure
  3. main and runApp
  4. Hot reload
  5. Summary - First app

3 Widget basics

  1. What is a widget?
  2. Widget tree
  3. BuildContext
  4. Material and Cupertino
  5. Summary - Widget basics

4 StatelessWidget

  1. What is StatelessWidget?
  2. The build method
  3. Passing parameters
  4. const constructor
  5. Summary - StatelessWidget

5 StatefulWidget

  1. What is StatefulWidget?
  2. createState and State
  3. The setState method
  4. initState and dispose
  5. Summary - StatefulWidget

6 Text and Container

  1. The Text widget
  2. TextStyle
  3. Container
  4. BoxDecoration
  5. Summary - Text and Container

7 Column and Row

  1. Column
  2. Row
  3. MainAxisAlignment
  4. CrossAxisAlignment
  5. Summary - Column and Row

8 Padding and margin

  1. The Padding widget
  2. EdgeInsets
  3. Container margin
  4. Spacing strategy
  5. Summary - Padding and margin

9 SizedBox and Center

  1. SizedBox
  2. The Center widget
  3. SizedBox.expand
  4. The Align widget
  5. Summary - SizedBox and Center

10 ListView

  1. What is ListView?
  2. ListView.builder
  3. ListTile
  4. Separator
  5. Summary - ListView

11 GestureDetector

  1. What is GestureDetector?
  2. onTap and onDoubleTap
  3. onLongPress
  4. onHorizontalDragUpdate
  5. Summary - GestureDetector

12 InkWell

  1. What is InkWell?
  2. InkWell vs GestureDetector
  3. Material parent
  4. onTap callback
  5. Summary - InkWell

13 ElevatedButton

  1. What is ElevatedButton?
  2. onPressed and child
  3. TextButton and OutlinedButton
  4. Button style
  5. Summary - ElevatedButton

14 TextFormField

  1. What is TextFormField?
  2. TextEditingController
  3. decoration and label
  4. obscureText
  5. Summary - TextFormField

15 Todo app

  1. Project skeleton
  2. Add screen
  3. List and onTap
  4. Delete and divider
  5. Summary - Todo app

16 Images

  1. AssetImage
  2. Image.network
  3. Image.file
  4. fit and size
  5. Summary - Images

17 Scaffold and AppBar

  1. What is Scaffold?
  2. AppBar
  3. FloatingActionButton
  4. Drawer
  5. Summary - Scaffold and AppBar

18 Navigator

  1. What is Navigator?
  2. Navigator.push
  3. MaterialPageRoute
  4. Navigator.pop
  5. Summary - Navigator

19 Counter app

  1. Project skeleton
  2. State and counter
  3. Increment button
  4. Decrement button
  5. Summary - Counter app

20 Beginner final

  1. Challenge 1
  2. Challenge 2
  3. Challenge 3
  4. Challenge 4