How to Debug MySQL and PHP Scripts for Android Applications: Troubleshooting Invalid JSON Responses and Other Errors

Debugging MySQL and PHP Scripts for Android Applications

When using a MySQL database with a PHP script for an Android application, it can be challenging to debug issues as the errors are often less clear compared to using LogCat. However, there are techniques to enhance debugging capabilities:

Printing Raw Response

To inspect the raw response from the server, add this line to your code before parsing it as JSON:

<code class="java">Log.i("tagconvertstr", "["+result+"]");</code>

This will display the raw response in the log, allowing you to identify any errors or unexpected behavior.

Breakpoints

If you are using Eclipse, you can set breakpoints in your code to pause execution and inspect variables. This allows you to trace the flow of execution and identify where issues may arise.

Error Handling

Ensure proper error handling in your code to capture and log any exceptions that occur during the HTTP request or JSON parsing. This will provide more detailed information about the cause of the error.

org.json.JSONException: Value

The error message indicates that the JSON being parsed is invalid. In your case, it appears that the string returned from the server contains HTML, specifically a line break
, which is not valid JSON. To resolve this, check the response from the PHP script and ensure that it returns valid JSON data.

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