requestRouteToHost android

Greetings everyone! I'm getting rather fed up with android's ConnectivityManager class. I've been trying for 5 hours to get the requestRouteToHost to work. I'm running my code on the emulator but the requestRouteToHost always 开发者_如何学Pythonfails. I know I have connectivity because I called getActiveNetworkInfo() and it was connected. I've added the ACCESS_NETWORK_STATE and CHANGE_NETWORK_STATE permissions to no avail. Any tips would be greatly appreciated.

EDIT-------- The method InetAddress.isReachable fails as well. I was using the hostname java.sun.com as specified in the docs. I think this is a problem with the emulator. Sam

Looks like requestRouteToHost() is not implemented for WiFi. WifiStateTracker private class does not have requestRouteToHost() implementation. Instead, default implementation from base class NetworkStateTracker always returns false.

I would recommend testing requestRouteToHost() with a real host. Not only am I unconvinced that localhost as a name is necessarily recognized on Android, it's going to be the device/emulator itself, which would go out via neither WiFi nor 3G, so I would expect requestRouteToHost() to fail.

You might also have a problem with wherever you are getting lookupHost() from. For example, I am not sure if this implementation supports localhost.

The requestRouteToHost(lookupHost()) combination you are doing is very risky

See your code:

conn_man.requestRouteToHost(ConnectivityManager.TYPE_WIFI, lookupHost("localhost")))

Here, you first made a host lookup, and next you are requesting a route to it. It will work fine only for static addresses (like localhost), where no real lookup is done. If you need a DNS lookup to resolve host address, it will fail easily. Generally, requestRouteToHost is handy for static addresses only.