Скачать или смотреть Solving the GetStorage returns null Issue in Flutter

Discover how to troubleshoot and resolve the common `GetStorage returns null` issue in your Flutter app, ensuring your data persists across sessions.
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This video is based on the question https://stackoverflow.com/q/72856800/ asked by the user 'compte profe' ( https://stackoverflow.com/u/18700395/ ) and on the answer https://stackoverflow.com/a/72865163/ provided by the user 'Saroopashree Kumaraguru' ( https://stackoverflow.com/u/11170382/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the GetStorage returns null Issue in Flutter

When developing Flutter applications, a common challenge developers face is managing data persistence. One reported issue is related to the GetStorage package, where the data retrieved returns as null after leaving and returning to the app. If you've encountered the frustrating phenomenon where your data disappears after closing and reopening your app, you are not alone.

The Problem

Many developers trying to save data using GetStorage find that when they exit the app and come back, the storage appears empty. Here’s a simplified example of how this issue can manifest in code:

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In this scenario, the intention is to read from local storage, but upon returning to the app, the expected data is missing.

Analyzing the Current Approach

The problem typically lies in the way data is being saved to the GetStorage. In the current code, when updating the measures, the data is written without ensuring that the operation completes before proceeding. A common oversight in asynchronous programming is neglecting to await the completion of storage operations, which can lead to unexpected behaviors such as losing data.

Example of updating get storage without awaiting:

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Key Points to Note:

Data persistence is crucial in applications to improve user experience.

Asynchronous operations need to be handled correctly to avoid unexpected behavior.

Solution: Implementing Proper Asynchronous Handling

To resolve the GetStorage returns null issue, it is essential to update the code to include the await keyword when writing to storage. This ensures that the data is fully written before proceeding with any further logic.

Step-by-Step Solution

Modify Data Update Logic: You need to make the setState function asynchronous to accommodate the await keyword. Here’s how to do it:

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Test Your Implementation: After making this change, run your application again. Check if your data now persists after closing and reopening the app.

Conclusion

Managing data in Flutter applications can sometimes be tricky, especially when utilizing asynchronous storage solutions like GetStorage. By ensuring that you await your storage write operations, you can prevent the frustrating issue of getting null values upon returning to your app. This small tweak can significantly enhance the reliability of data management in your applications.

If you encounter similar issues in the future, remember to inspect how you handle asynchronous functions and storage interactions carefully – it could save you a lot of debugging time!