How to Properly Save Data in Text Field Flutter using SharedPreferences

Описание: Learn how to effectively save and retrieve data using `SharedPreferences` in your Flutter app with a step-by-step guide.
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How to Properly Save Data in Text Field Flutter using SharedPreferences

When developing applications in Flutter, you might often need to manage user input. One common requirement is saving data entered in text fields so it can be displayed later. If you're facing challenges with achieving this functionality using SharedPreferences, you're not alone. Let's address a common problem related to data storage and retrieval from text fields, and how you can resolve it.

The Problem

While using SharedPreferences to save data from two text fields, many developers encounter an issue where the application only retrieves the expected value from the last text field. Specifically, you might want to capture a user's first name and last name, but end up only seeing the last name when you try to display them.

For example, you might have noticed that clicking the "Show Data" button returns a value that appears as LastName null instead of FirstName LastName.

Understanding SharedPreferences

SharedPreferences in Flutter allows you to save simple data in key-value pairs. However, an error in how you assign keys and values can lead to the application returning incorrect data. In your code, the issue arose because the last name was stored under the key for the first name. When trying to retrieve the data using that key, the app fetched the last name instead, leaving the first name as null.

The Solution

To resolve this issue, you need to ensure that you're using the correct keys when saving and retrieving the data. Follow these steps:

Step 1: Save Data

When you save the first name and last name, make sure that each is saved under its respective key. Here’s how to correct your saving function:

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

Step 2: Show Data

When retrieving the data, ensure that you are using the correct keys that match those used when saving the data. Update your showing function as follows:

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

Final Implementation

By making these adjustments in both your save and show functions, you can successfully capture and display both the first name and last name as intended.

Summary

To recap, when working with SharedPreferences in Flutter:

Always use distinct keys for each piece of data you save.

Ensure that you retrieve the data using the same keys you used for saving.

With these best practices in mind, you can efficiently save and display user input data in your Flutter applications, ensuring a smoother user experience.



By following this guide, you should be well-equipped to tackle similar issues in your Flutter projects, specifically regarding the use of SharedPreferences. Happy coding!