Resolving NetworkOnMainThreadException: Correcting Asynchronous Tasks in Android

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Resolving NetworkOnMainThreadException: Correcting Asynchronous Tasks in Android

Understanding the Problem

In Android development, performing long-running operations, such as network calls, on the main thread is not allowed, as it can lead to unresponsive applications. The exception you're experiencing is common when trying to call a SOAP service in Android, as shown in the example you provided. Despite using AsyncTask—a class designed to handle asynchronous tasks—you still faced this exception. Why does this happen? Let's break it down.

Example Code

Here's a snippet of the problematic code extracted from your implementation:

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

In the code above, you are attempting to directly call doInBackground(). This action blocks the main thread, resulting in the NetworkOnMainThreadException.

The Solution: Properly Using AsyncTask

To resolve this issue, you need to employ AsyncTask correctly. Instead of manually invoking doInBackground(), you should utilize the execute() method that AsyncTask provides. Here’s how to implement it properly:

Step-by-Step Correction

Change the Method of Calling AsyncTask: You need to initiate your AsyncTask using the execute() method instead of directly calling doInBackground().

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

Implementing the AsyncTask: Here's a refined version of your TESTROOT AsyncTask class that operates correctly:

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

Why This Change Matters

Non-blocking: Using execute() allows Android to manage your task in the background, keeping the UI responsive.

Lifecycle Awareness: When you use execute(), it handles threads more effectively and ensures that network operations are executed on a worker thread rather than the main thread.

Conclusion

If you have any additional questions or comments about asynchronous tasks in Android, don’t hesitate to reach out!