Скачать или смотреть How to Fix JSONException in Android When Working with Nested JSON in RecyclerView

Learn how to resolve issues when fetching data from a nested JSON structure in Android. This guide provides clear steps to rectify `JSONException` errors in your RecyclerView implementation.
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This video is based on the question https://stackoverflow.com/q/74981055/ asked by the user 'Mediad' ( https://stackoverflow.com/u/5669841/ ) and on the answer https://stackoverflow.com/a/74981274/ provided by the user 'Urvish Shiroya' ( https://stackoverflow.com/u/20015640/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Fix JSONException in Android When Working with Nested JSON in RecyclerView

If you're developing an Android app and trying to display data using a RecyclerView, you might encounter a common issue when fetching and parsing JSONObject data from an API, especially when dealing with nested JSON arrays. In this guide, we will break down the problem that arises with JSON parsing, particularly the JSONException that indicates a missing key, and we will explore a structured solution to handle it effectively.

Understanding the Problem

You are attempting to fetch JSON data from an API response and populate a RecyclerView with it. However, you're running into an issue when trying to access the answer_details array within your JSON object. This leads to the following error message:

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

This error indicates that your code is trying to access a key in the JSON object that does not exist in the context you're using it.

Sample JSON Data Structure

Your API response looks as follows:

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

The Error in Your Code

In your current implementation, you're using the following code snippet to access answer_details:

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

This line is problematic because you're trying to access answer_details at the wrong level of your JSON hierarchy.

The Solution: Correcting the JSON Access

To fix the issue, you need to change how you're accessing the answer_details. Below are the steps to correctly retrieve this data.

Step 1: Change JSON Access in Loop

Replace the erroneous line with the following code:

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

This change ensures you're retrieving answer_details from the JSONObject (o) that contains the details of each question being iterated over in your main data array.

Step 2: Properly Iterate and Access Nested JSON

Now your updated loop will look similar to this:

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

Step 3: Complete Code Snippet

Here is a more comprehensive example of the code structure:

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

Conclusion

Handling nested JSON structures can be tricky, especially when dealing with multiple arrays. The key takeaway here is to ensure that you're accessing each section of your JSON document at the correct level to avoid JSONException. By utilizing the corrected code structure and understanding the flow of your JSON data, you can effectively access all necessary information to populate your RecyclerView.

If you continue to encounter any issues or have further questions, feel free to reach out in the comments. Happy coding!