I am going to soon make a website idea expanded to smartphone apps. These apps will need to know the location of the user in question. I am doing a lot of research before I delve into these projects. I will need to make android , iphone, and blackberry apps for this idea. My question is, will I be able track these users location using the programming abilities these phones allow. Also how legal is this is; it something the user has to agree to. Basically I need to know their location to verify if they are in the place they say they are in. Any help would be greatly appreciated.
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Yes you can get the userlocation using the Geolocation API that is available in mobile browsers. They will have to grant your application permission to use it though.
A tutorial on how to use the API can be found here:
http://www.html5rocks.com/tutorials/geolocation/trip_meter/