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Learn how to effectively pass Map data retrieved from an API to multiple screens in Flutter applications, overcoming common pitfalls.
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How to Pass Map Data from API to Multiple Screens in Flutter

When developing applications in Flutter, it's common to need to pass data between different screens. One scenario developers frequently encounter is passing data retrieved from an API. In this guide, we'll address a common problem: How to pass Map data from an API to multiple screens in Flutter?

The Challenge

You might have encountered a situation where you successfully retrieved data from an API using a function. However, you struggle to pass this Map data between different screens of your app, especially when dealing with StatefulWidget or StatelessWidget. You might wonder why the functionality works seamlessly on one screen but becomes problematic on another.

Let’s dissect the issue step by step, and find a clear solution.

Retrieving API Data

First, here's a candid look at how you're retrieving data using the Dio package in Flutter.

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In this code, you created a function called pokeinfo that retrieves data from the Pokémon API. It takes the position of the Pokémon as an argument and returns a Map containing the Pokémon’s data.

Handling State and Creating a List

Next up is ensuring that you manage your app's state effectively to utilize the API data across multiple screens. Here's how you're currently managing the UI state:

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The above code is responsible for fetching and displaying the list of Pokémon. However, when it comes to passing the data to new screens, more steps are needed.

Solving the Problem

The good news is you can easily fix the data-passing issue by implementing the following steps:

1. Remove Specific Screens from the List

In your current implementation, you need to ensure your list is generic enough to accommodate different screens. Modify your list declaration to just List instead of specifying the type—this will allow greater flexibility.

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2. Update the List Creation Logic

Make sure you're correctly building lists of your PokeList instances:

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3. Class Declaration for Screens

Finally, to pass the data correctly to the new screen, you can declare your screen class to accept the data directly. Here’s a simple example:

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In this context, whenever you want to navigate to the new screen, you'll provide the data:

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Conclusion

Passing Map data retrieved from APIs between screens in Flutter doesn't have to be daunting. By following the steps outlined above, you can effectively manage your app’s state and transfer data smoothly across multiple screens. Remember, practice and experimenting with your data structures will significantly improve your understanding and capability as you develop your Flutter applications.

Embrace the power of Flutter, and happy coding!