How to send MMS not matter if built-in or Hangout's app is used?

I am trying to create an app that sends an MMS message.

Since it appears you can not programmically send an MMS message, it needs to use the devices "default" application to do the actual sending.

So, I am using the code found at this link to invoke an Intent for the default MMS app:

http://ift.tt/20tNm90

But, one of my testers said that they set "Google Hangouts" to be their default SMS/MMS app. So, when my app went to...

How to send MMS not matter if built-in or Hangout's app is used?

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