SecurityException: WifiService: Neither user 10082 nor current process has android.permission.ACCESS_WIFI_STATE

If you are trying to get scan the networks through a mobile device, first of all you have to add the permissions in your AndroidManifest.xml:








public class MainActivity ... {

 public void scanWiFi(View view) {
        mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);

        registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
        mainWifi.startScan();

}

    class WifiReceiver extends BroadcastReceiver {
        public void onReceive(Context c, Intent intent) {
            StringBuilder sb = new StringBuilder();
            wifiList = mainWifi.getScanResults();
            for (int i = 0; i < wifiList.size(); i++) {
                sb.append(new Integer(i + 1).toString() + ".");
                sb.append((wifiList.get(i)).SSID.toString());
                sb.append((wifiList.get(i)).frequency);
                sb.append((wifiList.get(i)).level);
                sb.append("\\n");
            }
            mainText.append(sb);
        }
    }

}