I am using the Wikitude API to develop an AR application for android. I would to define the range to search for the poi's, but i can't find it anywhere. Does the api permit to define the range?
have a look at the ActionRanges in the Wikitude reference library. That is what you are looking for in terms of radius and geofence.
actionRange = new AR.ActionRange(geoObject, 500);
From the documentation
AR.ActionRange ( geoLocation , radius , options )
Parameters:
geoLocation <GeoLocation> a single GeoLocation defining the center point of the circle.
radius <float> the radius of the ActionRange in meters.
options <object> Setup-Parameters to customize additional object properties.