use the compass heading and compare it with the bearing from your current
location to the building. Here's the formula in Objective-C but you
shouldn't have problems to convert this to Java
//spherical bearing between two coordinates
- (CGFloat) sphericalBearingFromLat1:(CGFloat)lat1 Lon1:(CGFloat)lon1
toLat2:(CGFloat)lat2 Lon2:(CGFloat)lon2 {
lat1 *= 0.0174533;
lat2 *= 0.0174533;
float dLon = (lon2-lon1) * 0.0174533;
float brng = 57.29578 * atan2(sin(dLon) * cos(lat2),
cos(lat1) * sin(lat2) - sin(lat1) *
cos(lat2) * cos(dLon));
if(brng <= 0.0f) brng += 360.0f;
return brng;
}
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