Can I turn on WiFi-Direct from code? on API-16 (Android 4.2.2)

Question

I am developing an application with NFC and wifi direct. I get the MAC address using NFC and the Wifi Direct to transfer data. I call discoverpeers() and could get success. But there is no callback WIFI_P2P_PEERS_CHANGED_ACTION, the callback comes only when I go to settings and the select wifidirect.

This was discussed in the other question

Can I turn on WiFi-Direct from code? on Android API-14 (ICS)

"I'd like to add that WiFi direct on JB and above (at least on AOSP) is not active all the time - it only appears to be. If you look at listeners for WiFi direct, it turns itself off after some time. It turns itself back on if you open the wifi direct menu, however. You might have to have the host do a peer search or initialize itself in order to be able to be found. Likely a battery saving trick. I have also found that it's blocking, since as it accepts a connection, the entire system will lock up and fail to connect sometimes. (The system invitation) – Mgamerz "

Can anyone suggest the solution for the problem WIFI_P2P_PEERS_CHANGED_ACTION callback is not got and can get only when manually go to settings->wifi->tap on wifidirect

I used two devices Samsung galaxy nexus and nexus 7 both running on 4.2.2

Answer 1

There is no available API to enable wifiP2P but you can invoke method "enableP2p" from android settings 4.0.1

WifiP2pManager manager = (WifiP2pManager) getActivity().getSystemService(Context.WIFI_P2P_SERVICE);
Channel channel = manager.initialize(getActivity(), getActivity().getMainLooper(), null);

try {
            Method method1 = manager.getClass().getMethod("enableP2p", Channel.class);
            method1.invoke(manager, channel);
            //Toast.makeText(getActivity(), "method found",
             //       Toast.LENGTH_SHORT).show();
} catch (Exception e) {
            //Toast.makeText(getActivity(), "method did not found",
                 //   Toast.LENGTH_SHORT).show();
        }

To disable wifiP2P use this method

Method method1 = manager.getClass().getMethod("disableP2p", Channel.class);