how to check wifi or 3g network is available on android device

Question

Here, my android device supports both wifi and 3g. At particular time which network is available on this device. Because my requirement is when 3g is available I have to upload small amount of data. when wifi is available entire data have to upload. So, I have to check connection is wifi or 3g. Please help me. Thanks in advance.

Answer 1

Take a look at that

http://stackoverflow.com/questions/2789612/how-can-i-check-whether-an-android-device-is-connected-to-the-web
http://stackoverflow.com/questions/3119607/how-to-be-notified-on-wifi-network-status-change
http://stackoverflow.com/questions/3211978/how-to-check-internet-connectivity-in-android
http://stackoverflow.com/questions/2919414/get-network-type
http://stackoverflow.com/search?q=ConnectivityManager

Answer 2

I use this:

/**
 * Checks if we have a valid Internet Connection on the device.
 * @param ctx
 * @return True if device has internet
 *
 * Code from: http://www.androidsnippets.org/snippets/131/
 */
public static boolean haveInternet(Context ctx) {

    NetworkInfo info = (NetworkInfo) ((ConnectivityManager) ctx
            .getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();

    if (info == null || !info.isConnected()) {
        return false;
    }
    if (info.isRoaming()) {
        // here is the roaming option you can change it if you want to
        // disable internet while roaming, just return false
        return false;
    }
    return true;
}