[android-developers] Forcing app to use wi-fi, not 3G, for latency reasons

My app uses a UDP network protocol involving very little data.  But the round-trip latency is important.  I have heard that 3G latency is more variable than wi-fi, especially after a long period of inactivity.  My app will use the network data after several hours of inactivity, and I want that very first access to have the shortest possible latency.  (It is querying a network time server).  I thought about sending out some nonsense UDP packets to some other host just to "wake up the channel", since I am told that the 3G network switches to faster response only after a few hits.  But then I thought it might be simpler just to insist that wi-fi be available to provide this particular function.  So is there anything in the API that allows me to either query if wi-fi is available, or to force the network access to use only wi-fi?

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