Get Wifi Interface name on Android

Question

I am currently developing a sort of wifi sniffer. To achieve that I use a tcpdump binary compiled for arm. But it\'s assume that I know the name of the Wifi Interface.

Answer 1

All the answers related to this question are not straight-forward. But you can achieve this by reflection. The code mentioned below will work even when there is no wifi connection.

    String interfaceName=null;
        try {
            Method m = Class.forName("android.os.SystemProperties").getMethod("get", String.class);
            interFace = (String) m.invoke(null, "wifi.interface");
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        System.out.println("Wifi Interface Name: " + interfaceName);

It is working on all the api levels (even when your targetsdk will be 30 inspite of some limitations added in reflection).