Struggling with parsing JSON data into a TextView resulting in app crashes

After completing the input, the app crashes without executing any further actions.

I have modified the code to display only the UPC and Product information instead of the entire section. Any suggestions on how to fix this issue?

If there is a similar question already answered somewhere, please provide a link for reference.

Error Logs:

A series of crash logs showing a NullPointerException in the networking code.
The Networking class in the net.example.glutefree package requires some updates to fix an issue regarding handling views in a separate thread.

XML layout file snippet:

The XML layout file contains TextView elements to display the fetched data.

New Error Details:

An error message indicating that the view hierarchy should only be accessed by the main thread and not from a background thread.
androidjsonparsing

Answer №1

After reviewing your logs, it appears that there is a NullPointerException on line 113:

TextView upca = (TextView)findViewById(R.id.textView1); //line 112
upca.setText("UPCA: " + UPCA); //line 113

This error indicates that the upca TextView is not properly initialized in line 112. Please verify if you have included a textView1 in the layout specified above.

Update: Another error you are encountering is 

ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

This issue arises when attempting to update the UI Thread from a different Thread. In the code, you are calling getServerData() from a new Thread, but then trying to modify the text of the TextViews belonging to the UI Thread within the method.

Does this explanation help clarify the situation?

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