File storage in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flutter package needed for file storage.

Flutter

import '[1]';

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Adart:io

Bpackage:flutter/material.dart

Cpackage:flutter/widgets.dart

Ddart:async

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Flutter UI packages instead of dart:io

Forgetting to import any package for file operations

The dart:io package provides file storage capabilities in Flutter.

2fill in blank

medium

Complete the code to get the path to the app's documents directory using path_provider.

Flutter

final directory = await get[1]Directory();

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AexternalStorage

BapplicationDocuments

Ctemporary

DapplicationSupport

Attempts:

3 left

💡 Hint

Common Mistakes

Using getTemporaryDirectory instead, which is cleared by the system

Using getExternalStorageDirectory which is for external storage

getApplicationDocumentsDirectory() returns the directory for user documents, suitable for file storage.

3fill in blank

hard

Fix the error in the code to write a string to a file.

Flutter

final file = File(path);
await file.[1]('Hello Flutter');

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AwriteAsString

BreadAsString

CopenRead

DreadAsBytes

Attempts:

3 left

💡 Hint

Common Mistakes

Using read methods instead of write methods

Forgetting to await the write operation

To write text to a file, use writeAsString. Other options are for reading.

4fill in blank

hard

Fill both blanks to read the content of a file as a string.

Flutter

final file = File([1]);
String content = await file.[2]();

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A'path/to/file.txt'

BwriteAsString

CreadAsString

DfilePath

Attempts:

3 left

💡 Hint

Common Mistakes

Using write methods instead of read methods

Passing a variable name instead of a string path

You need the file path as a string and then call readAsString() to get the file content.

5fill in blank

hard

Fill all three blanks to create a file, write text, and then read it back.

Flutter

final file = File([1]);
await file.[2]('Flutter Rocks');
String text = await file.[3]();

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A'my_file.txt'

BwriteAsString

CreadAsString

D'data.txt'

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect file path format

Mixing up read and write methods

Use a file path string like 'data.txt', then writeAsString to save text, and readAsString to read it back.