Hi Vatsal,
Those apps were likely written using the older Legacy ANT Chip API (or 3rd party variant), which gave running apps full control over the ANT radio, and then interpreted the message payload bytes manually, following each respective ANT+ Device Profile.
The new Android ANT API consists of 2 parts, an ANT Channel Library and an ANT+ Plugin Library. The ANT Channel library allows apps to request individual channels so that multiple apps can share the ANT radio concurrently. The ANT+ Plugin library builds upon the new Channel library, and performs all necessary decoding required by the profile for you, while also allowing multiple apps to concurrently access the same connected sensor.
I will have our lead plugin developer contact you about beta access and potential release dates.
Best regards.