public class MinimalWiFiDirect extends BroadcastReceiver implements PeerListListener {

    private WifiP2pManager manager;
    private Channel channel;

    public void init(Context context) {
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
        context.registerReceiver(this, intentFilter);

        manager = (WifiP2pManager) context.getSystemService(Context.WIFI_P2P_SERVICE);
        channel = manager.initialize(context, context.getMainLooper(), null);
        manager.discoverPeers(channel, null);
        Log.i("My", "Warte auf Wi-Fi Direct Broadcasts...");
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) {
            Log.i("My", "Wi-Fi Direct Peers haben sich veraendert");
            manager.requestPeers(channel, this);
        }
    }

    @Override
    public void onPeersAvailable(WifiP2pDeviceList wifiP2pDeviceList) {
        Collection<WifiP2pDevice> deviceList = wifiP2pDeviceList.getDeviceList();
        for (WifiP2pDevice device : deviceList) {
            Log.i("My", "Wi-Fi Direct Device: " + device.deviceName + ", " + device.deviceAddress);
        }
    }
}