Error handling for network calls in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main purpose of error handling in network calls?

To manage unexpected problems like no internet, server errors, or timeouts, so the app can respond gracefully and inform the user.

beginner

Which Flutter construct is commonly used to catch exceptions during network calls?

The try-catch block is used to catch exceptions and handle errors during network calls.

intermediate

What does the TimeoutException indicate in network calls?

It means the network request took too long and was stopped to avoid waiting forever.

beginner

Why should you show user-friendly messages when a network error occurs?

Because users need clear, simple info about what went wrong and what they can do next, like retry or check connection.

intermediate

How can you retry a failed network call in Flutter?

You can call the network function again after catching an error, optionally with a delay or limited attempts.

Which Flutter code structure is best for catching errors during a network call?

A switch-case

B if-else

C for loop

D try-catch

The try-catch block is designed to catch exceptions like network errors.

What should you do if a network call times out?

A Ignore it and continue

B Show an error message and allow retry

C Crash the app

D Restart the device

Showing an error and allowing retry helps users recover from timeouts.

Which exception might you catch for no internet connection in Flutter?

A SocketException

B FormatException

C IndexOutOfRangeException

D NullPointerException

SocketException usually indicates network connectivity issues.

Why is it important to handle errors in network calls?

A To prevent app crashes and improve user experience

B To make the app slower

C To hide bugs from developers

D To increase app size

Proper error handling keeps the app stable and user-friendly.

What Flutter package is commonly used for making HTTP network calls?

A flutter_network

B networking

C http

D flutter_http_client

The 'http' package is the standard for HTTP requests in Flutter.

Explain how you would handle a failed network call in Flutter to keep the app stable and user-friendly.

Think about catching errors and informing the user clearly.

Describe common exceptions you might catch during network calls and how to respond to them.

Focus on network-related exceptions and user feedback.