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Struggling with string manipulation in Flutter? Discover how to handle substrings correctly, especially with Unicode characters that can cause unexpected lengths and encoding issues.
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This video is based on the question https://stackoverflow.com/q/74626424/ asked by the user 'Sumit' ( https://stackoverflow.com/u/9592446/ ) and on the answer https://stackoverflow.com/a/74627056/ provided by the user 'eamirho3ein' ( https://stackoverflow.com/u/10306997/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Properly Use substring in Flutter to Handle Unicode Characters

When developing applications with Flutter, especially when working with text input and contact lists, you might encounter certain challenges related to string manipulation. A common problem developers face is when they need to extract substrings from contact names but encounter unexpected results due to encoding issues, particularly with Unicode characters.

The Problem

Imagine you're building an application to display a mobile contact list, where each contact is represented by their initials in a circle. However, you may find yourself struggling to get the correct initials:

You can successfully retrieve the initial character from names you type manually.

Yet, when accessing names from the mobile contact list, you may get unexpected output such as or see that the character length is double the expected amount, making it difficult to extract the initials properly.

Example Breakdown

Let’s look at the issue using some code snippets:

[[See Video to Reveal this Text or Code Snippet]]

In the example above, the substring method works correctly for the manually typed string "Nagesh," but when applied to a contact name, it leads to an error.

The Solution

To handle this issue, you can create a custom function that properly handles Unicode characters, especially useful for names that may contain special characters or emojis. Let's create a function called subOnCharecter.

Implementing the Function

Here's how you can implement this function:

[[See Video to Reveal this Text or Code Snippet]]

How to Use the Function

You can use this function just like you would the default substring method. Here’s how you do it:

[[See Video to Reveal this Text or Code Snippet]]

By substituting the default substring method with subOnCharecter, you can reliably pull out characters from strings, even those affected by Unicode issues.

Conclusion

In Flutter development, string manipulation can sometimes lead to unexpected results, especially when dealing with contact names containing special characters. By implementing a custom substring function that supports Unicode, you can overcome these challenges efficiently.

This solution ensures you can display initials accurately and prevents frustrating encoding errors that disrupt the user experience. Happy coding, and enjoy building your Flutter applications!