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Discover the solution to pass `Retrofit` response data successfully into `SharedPreferences` for ongoing use in your Android applications.
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How to Properly Process Retrofit Response in Android: Saving Data to SharedPreferences

When developing Android applications, retrieving data from APIs using libraries like Retrofit is a common task. While many developers successfully pass API responses to TextViews or display them through Toast messages, they might encounter issues when trying to save this data for later use. You may have faced a scenario where the API response is not being stored in SharedPreferences as expected. In this guide, we will explore this problem and provide a clear solution to ensure your response data is processed correctly and stored securely for future use.

Understanding the Problem

In the provided scenario, the developer is attempting to save an authentication token received from an API response into SharedPreferences. They noticed that while they could successfully show this token in a Toast, any attempts to save it using editor.putString() resulted in a null value. This raises the question: Why is the data not being saved properly despite being retrieved successfully?

Analyzing the Code

Let’s take a look at the key components of the code that are causing confusion:

LoginResponse POJO: The class is properly set up to convert the raw JSON response into a usable Java object.

API Call: The API call is executed correctly and the response seems valid when displayed via Toast.

Saving to SharedPreferences: Here lies the issue; the developer calls editor.putString(...) to store the token but fails to actually commit or apply those changes.

Here's the critical part of the code that needs attention:

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

The critical missing step here is the call to either apply() or commit() on the SharedPreferences.Editor instance. Without these methods, the data will not be persisted.

The Solution: Applying Changes

To successfully save the token into SharedPreferences, the developer simply needs to follow the putString() method with one of these two options:

1. Using apply() Method

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

This method saves the changes to SharedPreferences in the background, allowing the UI to remain responsive while the data is stored.

2. Using commit() Method

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

This method saves the changes immediately, but it's a blocking operation that may take longer to complete, potentially affecting UI performance.

Final Example Update

Updating the code with the missing method would look as follows:

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

Now, the token should be properly stored in SharedPreferences, making it accessible throughout the application’s lifecycle.

Conclusion

By ensuring that you always call either editor.apply() or editor.commit() after modifying SharedPreferences, you can confidently store your API response data for future use. This small oversight can save developers a lot of time in debugging and troubleshooting.

Next time you find yourself struggling to persist data retrieved from a Retrofit response, remember this essential step! If you have any further questions or require additional assistance, feel free to reach out.