Explore Exception Handling In Flutter
In this article, we will Explore Exception Handling In Flutter. We will learn about exception handling. An exception is an unusual state or occurrence that arises during program execution and disrupts the regular flow of code within your Flutter applications.
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Table Of Contents::
Why Need To Exception Handling?
What Is Exception In Flutter?
Exceptions are errors in the code that show something unexpected happened. When an unusual or unwanted situation arises, like when you try to divide a number by zero, access a null reference, encounter a formate exception, lose a network connection, etc., Flutter throws an exception. If the exception is not handled correctly, the program might end.
Why Need To Exception Handling?
There are some needs for exception handling are:
- > Creating dependable and sturdy Flutter applications requires knowing how to handle exceptions. You can detect exceptions, log them, and take the necessary steps to address problems and offer a positive user experience.
- > Using Flutter’s exception-handling feature will safeguard your application from crashing in the event of unforeseen errors. It all comes down to handling these errors with ease to keep your app functioning properly and provide a better user experience.
- > It offers a methodical approach to handling mistakes, enabling you to show error messages that are easy to understand or recover from with grace.
- > Exception handling improves the maintainability of the application by separating the error-handling code from the regular code.
Type Of Exception In Flutter:
> Dart Exceptions
- FormatException: This happens when you attempt to parse a value in an incorrect format, such as trying to parse an integer from a non-numeric string.
- RangeError: Raised in situations where a value or index is outside of a valid range, such as when a list’s out-of-bounds index is accessed.
> Flutter-Specific Exceptions
- PlatForm Exception: Encountered frequently when working with code specific to a platform, such as when calling native platform functions. Errors about device features, like location, permissions, camera access, and so forth, could be among them.
> Custom Exceptions
By defining new exception classes in Flutter that extend pre-existing Dart exception classes, like “Exception” or “Error,” you can create your exceptions. It is beneficial in assisting you in better classifying and managing particular application errors.
> Async/Await Exceptions
Exceptions that can happen when using asynchronous functions such as async/await and future. Errors about database queries, network requests, timeouts, etc. could be among them.
Async/await is frequently used for network requests and asynchronous operations, and try-catch blocks are used to handle exceptions. Async/await and Dart’s Future offer an organized method for managing asynchronous errors.
How To Handle Exception?
There are several ways we can deal with exceptions, some of which are listed below.
> Using Try And Catch.
We can handle the exception with the help of the Try/Catch block.
- Try: The code block where an exception can happen is called a try block. You can insert those codes that allow exceptions to occur in the try block. while the program is running.
- Catch: Any exceptions thrown in the try block are caught and handled in a catch block. To use the catch keyword to identify particular exceptions.
- Finally: The finally block is optional and is always run, regardless of whether an exception arises. The try/catch block is followed by the execution of a block.
Future<void> youMethod() async {
var url = Uri.parse('https://jsonplaceholder.typicode.com/posts');
try {
final response = await http.get(url).timeout(Duration(seconds: 5));
if (response.statusCode == 200) {
print("You response data is here==->${response.body}");
} else {
print("Not Getting success");
}
}catch (error, _) {
print(error.toString());
}finally {
print('API call completed.');
}
}
Conclusion:
In the article, I have explained the Exception Handling In Flutter; you can modify this code according to your choice. This was a small introduction to Exception Handling In Flutter User Interaction from my side, and it’s working using Flutter.
I hope this blog will provide you with sufficient information on Trying the Exception Handling In Flutter of your projects. Using exception handling in Flutter is essential to improving, simplifying, and managing your application. Exception handling is a crucial part of creating a dependable and adaptable Flutter application. So please try it.
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