Hi Mahesh
Firstly, are you trying to create an app which talks to ANT+ devices, or implementing custom communication using the ANT protocol? The ANT+ API is provided in the ANT Plugin Lib, the ANT API is provided in the ANT Lib. You will generally not require both, which is why they are provided as separate SDK's. The ANT+ Plugin Sampler provides sample code for using the ANT+ API to communicate with ANT+ devices.
The Open Channel button is only available when you have an ANT channel available on your device. You should first read the ANT+/ANT Application Requirements section of the relevant Creating ANT/ANT+ Android Apps document in the SDK.