Provider package in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Provider package in a Flutter app.

Flutter

import 'package:flutter/material.dart';
import '[1]';

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

Aprovider/flutter.dart

Bprovider.dart

Cpackage:provider/provider.dart

Dflutter/provider.dart

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to include 'package:' in the import path.

Using incorrect folder names in the import path.

The correct import path for the Provider package is 'package:provider/provider.dart'.

2fill in blank

medium

Complete the code to provide a ChangeNotifier to the widget tree.

Flutter

ChangeNotifierProvider(
  create: (context) => [1](),
  child: MyApp(),
)

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

AMyModel

BChangeNotifier

CProvider

DBuildContext

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ChangeNotifier' instead of your model class name.

Passing BuildContext instead of a model instance.

You provide an instance of your ChangeNotifier class, here named MyModel, to the widget tree.

3fill in blank

hard

Fix the error in accessing the provider inside a widget build method.

Flutter

final model = Provider.of<[1]>(context);

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

ABuildContext

BMyModel

CChangeNotifierProvider

DWidget

Attempts:

3 left

💡 Hint

Common Mistakes

Using BuildContext or Widget as the generic type.

Omitting the generic type entirely.

You must specify your model class (e.g., MyModel) inside the angle brackets to access the provider.

4fill in blank

hard

Fill both blanks to listen to changes and rebuild the widget accordingly.

Flutter

final model = Provider.of<[1]>(context, [2]: true);

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AMyModel

Blisten

Cchild

Dcontext

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'child' or 'context' instead of 'listen' as the parameter.

Setting listen to false when you want to rebuild on changes.

To listen for changes and rebuild, set listen: true when accessing the provider with your model class.

5fill in blank

hard

Fill all three blanks to update the model and notify listeners.

Flutter

class MyModel extends ChangeNotifier {
  int _count = 0;

  int get count => [1];

  void increment() {
    _count [2] 1;
    [3]();
  }
}

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

A_count

B+=

CnotifyListeners

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Returning 'count' inside the getter causing recursion.

Using '=' instead of '+=' for increment.

Forgetting to call notifyListeners() after changing state.

The getter returns _count, increment adds 1 to _count, and notifyListeners() tells widgets to rebuild.