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If the viz lives in Tableau Online, then a user will need to login. If the data is public or can be shared, then you could host it on Tableau Public where a login would not be required.
Thanks Patrick for the reply,
we were able to implement the thing. It was something on the android dev side we took care of and now we have our own standalone tableau app with which we were able to give access to particular viz(/vizs) to a particular user(/users)