**Solved: FormatException: Invalid radix-10 number Error in Flutter**
Hey there, Flutter developers! Have you ever encountered the frustrating error “FormatException: Invalid radix-10 number” when working with numbers in your Flutter app? You’re not alone! This error can be particularly pesky when you’re trying to display or parse numbers from a database or API.
In this post, we’ll dive into the root cause of the error and provide a step-by-step solution to help you resolve the issue and get your app running smoothly again.
**What is FormatException: Invalid radix-10 number Error?**
The “FormatException: Invalid radix-10 number” error occurs when you’re trying to parse or convert a string to a numeric value, but the string contains invalid characters or is not in the correct format. Radix-10, in this context, refers to the decimal system, where digits range from 0 to 9.
**Common Causes of the Error**
Before we jump into the solution, let’s quickly review some common scenarios that may lead to this error:
* **Invalid input data**: You’re receiving invalid data from an API or database, which contains characters outside the valid range (e.g., alphanumeric characters or special characters).
* **Incorrect string formatting**: You’re using the wrong format string when converting a string to a numeric value.
* **Unintended whitespace**: There are extra spaces or characters in the input string that are causing the parsing to fail.
**Step-by-Step Solution**
Now that we’ve covered the basics, let’s break down the solution into smaller steps:
1. **Inspect the input data**: Take a closer look at the input data that’s causing the error. Check for any invalid characters, extra spaces, or unusual formatting. If you’re receiving data from an API or database, ensure that it’s properly formatted and validated.
2. **Trim and clean the input string**: Use the `trim()` method to remove any leading or trailing whitespace from the input string. This can help eliminate any unnecessary characters that might be causing the parsing to fail.
3. **Use the correct format string**: Verify that you’re using the correct format string when converting the string to a numeric value. For example, if you’re trying to parse a decimal number, use `double.parse()` instead of `int.parse()`.
4. **Catch and handle exceptions**: To handle the error in a more robust way, wrap your parsing code in a `try-catch` block. This will allow you to catch and handle the `FormatException` error, and provide a more user-friendly error message to the user.
Here’s an example of how you can implement the solution:
“`dart
try {
double parsedNumber = double.parse(inputString.trim());
// Do something with the parsed number
} catch (e) {
// Handle the error
print(‘Error: Invalid input format. Please check the input data.’);
}
“`
**Conclusion**
By following these simple steps, you should be able to resolve the “FormatException: Invalid radix-10 number” error in your Flutter app. Remember to inspect the input data, trim and clean the input string, use the correct format string, and catch and handle exceptions to provide a better user experience.
If you’re still stuck or have any further questions, feel free to leave a comment below. Happy coding, and happy Fluttering!
