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Fluttermobile~10 mins

Flutter project structure - Interactive Code Practice

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Practice - 5 Tasks
Answer the questions below
1fill in blank
easy

Complete the code to import the Flutter material package.

Flutter
import '[1]';
Drag options to blanks, or click blank then click option'
Apackage:flutter/material.dart
Bpackage:flutter/widgets.dart
Cpackage:flutter/cupertino.dart
Dpackage:flutter/foundation.dart
Attempts:
3 left
💡 Hint
Common Mistakes
Using cupertino.dart when building a Material Design app.
Forgetting to include the full package path.
2fill in blank
medium

Complete the code to create the main entry point of a Flutter app.

Flutter
void main() => [1](MyApp());
Drag options to blanks, or click blank then click option'
AstartApp
BbeginApp
ClaunchApp
DrunApp
Attempts:
3 left
💡 Hint
Common Mistakes
Using a non-existent function like startApp or launchApp.
Forgetting to call runApp in main.
3fill in blank
hard

Fix the error in the Flutter widget class declaration.

Flutter
class MyApp extends [1]Widget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp();
  }
}
Drag options to blanks, or click blank then click option'
AStateful
BInherited
CStateless
DCustom
Attempts:
3 left
💡 Hint
Common Mistakes
Using StatefulWidget without managing state.
Using a non-existent widget class like CustomWidget.
4fill in blank
hard

Fill both blanks to complete the Flutter widget tree with a Scaffold and AppBar.

Flutter
return MaterialApp(
  home: Scaffold(
    appBar: [1](
      title: [2]('Home'),
    ),
  ),
);
Drag options to blanks, or click blank then click option'
AAppBar
BText
CContainer
DColumn
Attempts:
3 left
💡 Hint
Common Mistakes
Using Container or Column instead of AppBar for the appBar property.
Using Container or Column instead of Text for the title.
5fill in blank
hard

Fill all three blanks to create a Flutter widget with a Center, Column, and two Text widgets.

Flutter
return Scaffold(
  body: [1](
    child: [2](
      children: [
        [3]('Hello'),
        Text('World'),
      ],
    ),
  ),
);
Drag options to blanks, or click blank then click option'
ACenter
BColumn
CText
DRow
Attempts:
3 left
💡 Hint
Common Mistakes
Using Row instead of Column for vertical layout.
Forgetting to wrap children in a Column.
Using Container instead of Center.

Practice

(1/5)
1. Which folder in a Flutter project contains the main Dart code for your app?
easy
A. lib/
B. android/
C. ios/
D. test/

Solution

  1. Step 1: Identify the folder purpose

    The lib/ folder is where Dart code for the app lives.
  2. Step 2: Compare with other folders

    android/ and ios/ hold platform-specific files, test/ holds tests.
  3. Final Answer:

    lib/ -> Option A
  4. Quick Check:

    Main Dart code folder = lib/ [OK]
Hint: Main app code is always in lib/ folder [OK]
Common Mistakes:
  • Confusing android/ with code folder
  • Thinking test/ holds main code
  • Mixing ios/ with Dart code
2. Which file manages app dependencies and assets in a Flutter project?
easy
A. main.dart
B. pubspec.yaml
C. build.gradle
D. AndroidManifest.xml

Solution

  1. Step 1: Understand file roles

    pubspec.yaml is the config file for dependencies and assets.
  2. Step 2: Differentiate from other files

    main.dart is code, build.gradle is Android build config, AndroidManifest.xml is Android app manifest.
  3. Final Answer:

    pubspec.yaml -> Option B
  4. Quick Check:

    Dependencies and assets file = pubspec.yaml [OK]
Hint: pubspec.yaml always manages dependencies and assets [OK]
Common Mistakes:
  • Choosing main.dart as config file
  • Confusing build.gradle with Flutter config
  • Mixing AndroidManifest.xml with Flutter dependencies
3. What will happen if you put your test files inside the lib/ folder instead of test/?
medium
A. Tests will automatically move to test/ folder
B. Tests will run normally without issues
C. App will fail to compile due to test files
D. Tests may be included in the app build, increasing size

Solution

  1. Step 1: Understand folder roles

    lib/ is for app code; test/ is for tests only.
  2. Step 2: Consequence of wrong placement

    Putting tests in lib/ includes them in app build, increasing size unnecessarily.
  3. Final Answer:

    Tests may be included in the app build, increasing size -> Option D
  4. Quick Check:

    Tests in lib/ increase app size [OK]
Hint: Keep tests only in test/ folder to avoid bloated app [OK]
Common Mistakes:
  • Assuming tests run normally in lib/
  • Thinking app will fail to compile
  • Believing tests auto-move folders
4. You accidentally deleted the android/ folder in your Flutter project. What is the likely result?
medium
A. The iOS build will fail instead
B. The app will still build and run on Android devices
C. You will get errors when building for Android platform
D. Flutter will recreate the android/ folder automatically

Solution

  1. Step 1: Role of android/ folder

    The android/ folder contains platform-specific files needed to build Android apps.
  2. Step 2: Effect of deletion

    Deleting it causes build errors when targeting Android because required files are missing.
  3. Final Answer:

    You will get errors when building for Android platform -> Option C
  4. Quick Check:

    Missing android/ folder causes Android build errors [OK]
Hint: android/ folder is essential for Android builds [OK]
Common Mistakes:
  • Assuming app runs without android/ folder
  • Thinking iOS build is affected
  • Believing Flutter auto-recreates android/
5. You want to add a new image asset to your Flutter app. Which two steps must you do to use it correctly?
hard
A. Place the image in assets/ folder and declare it in pubspec.yaml
B. Place the image in android/ folder and import it in main.dart
C. Place the image in lib/ and add it to pubspec.yaml
D. Place the image in test/ folder and reference it in code

Solution

  1. Step 1: Store image in assets/ folder

    Images should be placed in a dedicated folder like assets/ for organization.
  2. Step 2: Declare asset in pubspec.yaml

    You must list the image path under flutter/assets in pubspec.yaml to use it.
  3. Final Answer:

    Place the image in assets/ folder and declare it in pubspec.yaml -> Option A
  4. Quick Check:

    Assets folder + pubspec.yaml declaration = correct asset use [OK]
Hint: Always declare assets in pubspec.yaml after adding files [OK]
Common Mistakes:
  • Putting images in lib/ folder
  • Not declaring assets in pubspec.yaml
  • Placing images in android/ or test/ folders
Recommended

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10 questions~5 mineasy hard