@whitebrazilian1
First, as to current advanced measurement support, I am referring to the ANT+ Plugins API which is NOT the approach used by the currently released ANT+ demo. It would be possible to manually code the additional logic to handle the advanced measurement, but this is not recommended. There are a lot of fringe-cases to handle in the current weight profile and making a robust implementation is not as trivial as it seems. The new ANT+
As I said, if you look in the downloads section you can find the Android SDK which contains a new ANT+ sample code called the ANT+ Sampler which shows how to use the new API. Using the new API will mean you don't have to decode the raw message data and you don't have to manage the channel connection directly among other things. You should not use the legacy interface anymore, especially if you are developing a new application. If you want access to the advanced measurement portion of the API ahead of the upcoming public release please PM me your email and I will send you the beta release.
Second, OMB is correct, Tanita has chosen to use a proprietary format for their advanced measurements, so we will not provide any decoding of that data. Your only choice when using this scale is indeed as OMB stated: "Contact Tanita and ask if they disclose the format to you" or use an alternative scale.