means in cayenne my devices
i am not getting what you are trying to convey. can you give more details about it.
Now after the creation of the control buttons and the Viewer values in Cayenne a possible conversion application opens in the android studio
no, you got to write your own code to call the API and get the data.
where write my code in android studio
i am not familiar with android studio but there are couple of tutorial in the community on how to create your own app using MIT app inventor. though we have updated our Rest API calls, so you will have to modify accordingly.