Hot reload and hot restart in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to perform a hot reload in Flutter.

Flutter

void main() {
  runApp(MyApp());
  WidgetsBinding.instance.addPostFrameCallback((_) {
    [1]();
  });
}

Drag options to blanks, or click blank then click option'

AhotRestart

BsetState

CrunApp

DhotReload

Attempts:

3 left

💡 Hint

Common Mistakes

Using hotRestart instead of hotReload causes a full restart.

Calling runApp again reloads the whole app, not just the UI.

Calling runApp() again reloads the UI in Flutter, which is how hot reload is typically triggered programmatically.

2fill in blank

medium

Complete the code to perform a hot restart in Flutter.

Flutter

void main() {
  runApp(MyApp());
  [1]();
}

Drag options to blanks, or click blank then click option'

AhotReload

BhotRestart

CsetState

Drebuild

Attempts:

3 left

💡 Hint

Common Mistakes

Using hotReload instead of hotRestart keeps the app state.

Calling setState only rebuilds widgets, not the whole app.

The method hotRestart() restarts the Flutter app fully, clearing all state.

3fill in blank

hard

Fix the error in the code to trigger hot reload correctly.

Flutter

void main() {
  runApp(MyApp());
  WidgetsBinding.instance.[1](() {
    print('Hot reload triggered');
  });
}

Drag options to blanks, or click blank then click option'

AaddReloadCallback

BaddListener

CaddObserver

DaddPostFrameCallback

Attempts:

3 left

💡 Hint

Common Mistakes

Using addListener or addObserver causes errors as they don't exist here.

addReloadCallback is not a Flutter method.

addPostFrameCallback schedules a callback after the current frame, suitable for hot reload triggers.

4fill in blank

hard

Fill both blanks to create a button that triggers hot reload when pressed.

Flutter

ElevatedButton(
  onPressed: () {
    [1]();
  },
  child: Text('[2]'),
)

Drag options to blanks, or click blank then click option'

AhotReload

BhotRestart

CReload UI

DRestart App

Attempts:

3 left

💡 Hint

Common Mistakes

Using hotRestart() here restarts the whole app, not just UI.

Button text should match the action for clarity.

The button calls hotReload() and shows text 'Reload UI' to indicate hot reload action.

5fill in blank

hard

Fill all three blanks to create a button that triggers hot restart and shows correct label.

Flutter

ElevatedButton(
  onPressed: () {
    [1]();
  },
  child: Text('[2]'),
  style: ButtonStyle(
    backgroundColor: MaterialStateProperty.all<Color>([3]),
  ),
)

Drag options to blanks, or click blank then click option'

AhotReload

BhotRestart

CRestart App

DColors.red

Attempts:

3 left

💡 Hint

Common Mistakes

Using hotReload() instead of hotRestart() changes behavior.

Incorrect color value causes UI errors.

The button calls hotRestart(), shows 'Restart App' label, and has a red background color.