Скачать или смотреть How to Fix the NoSuchMethodError When Fetching Data in Your Flutter App

Discover how to resolve the `NoSuchMethodError` in your Flutter application when retrieving data from NewsAPI, and learn to properly display the news articles on-screen.
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This video is based on the question https://stackoverflow.com/q/64942922/ asked by the user 'Ali Hassan' ( https://stackoverflow.com/u/14155807/ ) and on the answer https://stackoverflow.com/a/64944517/ provided by the user 'Mr Random' ( https://stackoverflow.com/u/12327112/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the NoSuchMethodError in Your Flutter News App

If you’re developing a Flutter application to display news articles using the NewsAPI and encountering issues where nothing shows up on screen while you can see data in the console, you’re not alone! This common issue often arises from improper handling of asynchronous data fetching and UI updates. In this guide, we will explore the root cause of this problem and how to effectively resolve it to display your news articles correctly.

Understanding the Problem

You might be experiencing an error similar to this one while trying to build your application:

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

This error typically occurs when the application tries to access the articles property of the NewsApi object, which has not yet been initialized or is not ready at the time of access. This often happens when the data is being fetched asynchronously but the UI code is not positioned correctly to handle such cases.

Solution Steps

To fix the issue and ensure your app retrieves and displays news articles correctly, follow these steps:

1. Update the initState Method

You need to ensure that you're fetching the data using the correct method. In your initState, the news variable should be initialized with the getNews() method from your Network class rather than assigning it directly to the NewsApi class:

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

2. Handle Data Loading in the UI

Once you’ve corrected the data fetching in initState, you must also ensure that your UI appropriately handles the data as it loads. Modify your build method within the FutureBuilder to manage cases where data has not been completely fetched yet and is null:

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

3. Testing the Application

Make sure to test your application after making these changes. You should see the news articles loading on the screen as intended. If there are still issues, check your console for any errors and verify that the network call is functioning properly.

Conclusion

Fixing the NoSuchMethodError when fetching data from the NewsAPI in your Flutter application involves properly initializing your asynchronous data fetching and ensuring that your UI is set up to manage the state of that data effectively. By following the steps outlined in this blog, you can successfully display news articles on-screen and handle any potential errors gracefully. Happy coding!