Скачать или смотреть How to Create and Write Files in Flutter: Step-by-Step Guide

Learn how to create and write files in Flutter applications using the `path_provider` package. This guide provides solutions and best practices to manage file storage effectively.
---
This video is based on the question https://stackoverflow.com/q/64491219/ asked by the user 'dramaticlook' ( https://stackoverflow.com/u/852146/ ) and on the answer https://stackoverflow.com/a/64566964/ provided by the user 'dramaticlook' ( https://stackoverflow.com/u/852146/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Flutter create a file and write its contents

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Create and Write Files in Flutter: Step-by-Step Guide

Flutter is an incredible framework for building cross-platform applications, but handling file storage can sometimes lead to issues. If you’re working on an app that gathers content from a server and needs to save it locally, you may run into hurdles, like the FileSystemException you've encountered. In this guide, we will dive into how to create a file, write its contents, and troubleshoot common errors.

Understanding the Problem

You mentioned that your app needs to save text content from the server into separate files within a folder named storage. The specific file in question, fileList.txt, is meant to track these files.

You correctly declared the storage folder in your pubspec.yaml file, making it accessible during development. The code snippet you've provided for reading this file seems fine:

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

However, when you attempt to save a file, such as file4.dat, you're receiving an error indicating that the file or directory does not exist.

Breaking Down the Solution

Utilizing the path_provider Package

To resolve the file storage issue, the first step is to ensure you are using the path_provider package correctly. Here’s how you can achieve file creation and writing.

Set Up Your Dependencies
If you haven’t done so already, include the path_provider package in your pubspec.yaml file:

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

Get The Correct Directory
Depending on the platform your application is running on (Android or iOS), you should determine the appropriate directory for file storage.

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

Writing the File

Create a Function to Write to File
Now that you have ensured you’re using the right directory, the _writeFile function should look similar to this:

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

Call Your Save Function
Finally, call your function with the necessary parameters:

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

Final Notes

File Structure: Ensure that the "storage/files" directory exists before writing files to it. You may need to create this structure programmatically if it doesn’t exist.

Error Handling: Implement appropriate error handling to catch any exceptions during file operations.

Conclusion

With these steps, you should be able to successfully create and write files in Flutter without encountering the FileSystemException you've seen. By utilizing the path_provider package and appropriately managing file directories, you can streamline your app's file storage functionalities.

If you have any questions or run into issues while implementing these solutions, feel free to reach out. Happy coding!