How to check internet connectivity in android?

friends,

i am trying to check internetconnectivity in android and using following code

final ConnectivityManager conn_manager = (ConnectivityManager) 
            this.getSystemService(Context.CONNECTIVITY_SERVICE);


            final NetworkInfo network_info = conn_manager.getActiveNetworkInfo();
            if ( network_info != null && network_info.isConnected() ) 
            {
                return true;
            }
          开发者_如何学运维  else
            {
                return false;
            }

but it gives me network/ wifi connectivity if wifi is connected it gives me true and if internet is not connected then it also gives me true.

any one guide me what is the solution?

---

Probably some issue with the logic you have in the if clause there.

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;
}

---

You can use requstRouteToHost to check if you can connect to a specific IP address.

---

Use this nifty library: http://code.google.com/p/connectivity

You can subscribe to network status notification and get a callback when network status changes. Or, you can query directly if network is available. Very simple to use.