Solving the Instance of 'Future dynamic ' Issue in Flutter with Shared Preferences

Encountering `Instance of 'Future dynamic '` in Flutter? Learn how to properly use async functions with Shared Preferences to retrieve values seamlessly.
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This video is based on the question https://stackoverflow.com/q/67228351/ asked by the user 'krish cyber' ( https://stackoverflow.com/u/14328834/ ) and on the answer https://stackoverflow.com/a/67229349/ provided by the user 'Omatt' ( https://stackoverflow.com/u/2497859/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Instance of 'Future<dynamic>' Issue in Flutter with Shared Preferences

If you're developing a Flutter application and have encountered the problem of seeing Instance of 'Future<dynamic>' when trying to debug your code, you're not alone. This common issue can be quite perplexing, especially when you're trying to retrieve data from shared preferences. Let's dive into the problem and discover how to effectively solve it.

Understanding the Problem

When you attempt to print the result of an asynchronous function directly, like this:

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

You will get a message like Instance of 'Future<dynamic>'. This occurs because the method getIntValuesSF() is asynchronous and returns a Future. The actual value is not available immediately; it will be available once the asynchronous operation completes.

Key Points to Note:

Asynchronous functions return a Future object.

You need to wait for the Future to complete to access the resulting value.

Directly printing the Future itself will not give you the intended output.

The Solution: Correctly Using Async Functions

To handle this issue, you'll want to properly wait for the Future to complete and then retrieve its value. Here’s how to do it step-by-step:

Step 1: Modify the initState Method

Replace your initState method with a version that uses then to properly handle the asynchronous nature of your function:

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

Step 2: Understand the Changes

Data Retrieval: With the then method, you specify a function to be executed once the getIntValuesSF() finishes executing, passing its resulting value to that function.

Error Checking: You can add further error handling within this then clause to manage cases where the value might not be what you expect.

Implementation Consideration

Always ensure that your application can handle potential null values gracefully, especially when working with shared preferences where the data might not always be set.

Conclusion

By utilizing the then method to handle the returned Future, you effectively manage the asynchronous nature of your code in Flutter. This enhancement allows you to print the actual integer value stored in shared preferences, rather than the Future instance. Implementing these changes should help you troubleshoot and fix the printing issue in your Flutter application.

Be sure to apply these concepts in your future Flutter projects to avoid running into similar issues. Happy coding!

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