@Override
public void onResume() {
    super.onResume();
    //Note: Not using RSSI_CHANGED_ACTION because it never calls me back.
    IntentFilter rssiFilter = new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
    this.registerReceiver(myRssiChangeReceiver, rssiFilter);

    WifiManager wifiMan=(WifiManager)getActivity().getSystemService(Context.WIFI_SERVICE);
    wifiMan.startScan();
}


    @Override
public void onPause() {
    super.onPause();
    this.unregisterReceiver(myRssiChangeReceiver);

}
/**
 * Broadcast receiver to update
 */
private BroadcastReceiver myRssiChangeReceiver
        = new BroadcastReceiver(){
    @Override
    public void onReceive(Context arg0, Intent arg1) {
        WifiManager wifiMan=(WifiManager)getActivity().getSystemService(Context.WIFI_SERVICE);
        wifiMan.startScan();
        int newRssi = wifiMan.getConnectionInfo().getRssi();
        Toast.makeText(getActivity(), ""+newRssi, Toast.LENGTH_SHORT).show();

}};