How can I read the last change even if the program is closed and opened in the differences in the flutter program?

Question

I am developing a project in flutter. this project works with api. I offer the option to change the api url from within the program. When the user makes changes in the program, even if the program is opened and closed, I want to read the last change.

I'm new to flutter so I don't know. I am asking this question for information. For example, I gave the value x to the api variable. Then I gave the y value instead of the x value in the program. Now I want to read every xaman y variable when the program is closed and opened. What is my way to do this?

If I give an example from C#, properties settings file

Answer 1

You can use the shared_preferences package for this.

Slightly shortened example from their own page:

Setting the value:

// Obtain shared preferences.
final prefs = await SharedPreferences.getInstance();

// Save an String value to 'action' key.
await prefs.setString('url', 'https://your.api.example.com');

Reading the value later or after a app restart:

// Obtain shared preferences.
final prefs = await SharedPreferences.getInstance();

final String? url = prefs.getString('url');