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Can I have both Wi-Fi and cellular network interfaces open at the same time on Android?

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By User


I'm working on an application that will run on a phone where the phone will be a station on a private Wi-Fi network. The phone will be a station, not an access point, and the private Wi-Fi network does not route to the Internet. My application needs to communicate with servers on the Internet as well as devices on the local Wi-Fi network, so it needs to have connections on both networks at the same time. I've been trying to figure out how to do this.



I've been trying the technique described in the discussion on the Goggle Android developers group titled "Can Android 2.X connect to 3G and Wifi data networks simultaneously?", but it is not working well. What I find is that when I enable the cellular network by calling ConnectivityManager.setNetworkPreference(ConnectivityManager.TYPE_MOBILE), any sockets I have open on the Wi-Fi network are closed. I haven't tried it, but I suspect the same thing will happen to sockets on the cellular network when I switch back to Wi-Fi. Another problem is that these calls operate on a global level, changing the network settings for the entire phone, not just the application. Switching the network set up globally like this will interfere with any other app that happens to be running on the phone. Even after my application exits, the phone continues to run with the last network configuration it set.



I'm looking for a way to have connections open on both the cellular data and Wi-Fi networks at the same time, and without interfering with other applications running on the phone. Does anyone know how to do this? Does anyone know if this is possible?



Thanks for your help.


Source: Tips4all
Source: Tips4allSource: CCNA FINAL EXAM
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Comments

  1. UserMay 9, 2012 at 2:14 AM

    If you can't make it using API calls and if you are willing to get your hands dirty with the lower level, some linux knowledge may help.
    Basically what you have to do is to bring up both interfaces and have the default route set on the 3g interface.
    You will have to use system commands with root privileges for this kind of task.
    The reason for the close sockets is probably the interface that goes down and up again because of the API call.

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