What you are describing indicates that the connection to Authorize.Net is failing. Unfortunately, it's hard to guess what might be happening in the background. I would recommend starting to debug by simply testing the connection to our API outside of the SDK/App. For instance, you can check just to ensure that your device can contact https://api.authorize.net/xml/v1/schema/AnetApiSchema.xsd.
For additional debugging, the SDK itself is hoooked into android.util.log. You can up the logging level in logging.properties if you want to retrieve more details about what is actually going on during development.
