How do you get the current DNS servers for Android?

Question

I'm trying to get hold of the addresses to the currently used DNS servers in my application, either I'm connected thru Wifi or mobile. The DhcpInfo object should provide this but how can I get hold of a valid DhcpInfo object?

Answer 1

Calling for the getRuntime().exec can hang your application.

android.net.NetworkUtils.runDhcp() cause unnecessary network requests.

So I prefer to do this:

Class<?> SystemProperties = Class.forName("android.os.SystemProperties");
Method method = SystemProperties.getMethod("get", new Class[] { String.class });
ArrayList<String> servers = new ArrayList<String>();
for (String name : new String[] { "net.dns1", "net.dns2", "net.dns3", "net.dns4", }) {
    String value = (String) method.invoke(null, name);
    if (value != null && !"".equals(value) && !servers.contains(value))
        servers.add(value);
}