Always getting -1 in adding new wifiConfiguration in wifiiManager

I create a wifis list in a range and show it to the user. I want the user to be able to select each of the items in the list and insert a password to connect to the selected SSID.

I wrote this method for connecting wifi:

    private WifiConfiguration wifiConf;             /* WifiConfiguration object */
    private WifiManager wifiMgr;                            /* WifiManager object */
    private WifiInfo wifiInfo;                              /* WifiInfo object */


        public boolean connectToSelectedNetwork(String networkSSID, String networkPassword, String securityType) {

    int networkId;
    int SecurityProtocol;

    if (securityType.contains("WEP")) {
      SecurityProtocol = 1;
      Log.i(TAG, "Security:  WEP");
    } else if (securityType.contains("WPA2")) {
      Log.i(TAG, "Security:  WPA2");
      SecurityProtocol = 2;
    } else if (securityType.contains("WPA")) {
      Log.i(TAG, "Security:  WPA");
      SecurityProtocol = 3;
    } else {
      Log.i(TAG, "Security:  OPEN");
      SecurityProtocol = 4;
    }


    // Clear wifi configuration variable
    clearWifiConfig();

    // Sets network SSID name on wifiConf
    wifiConf.SSID = "\"" + networkSSID + "\"";
    Log.i(TAG, "SSID Received: " + wifiConf.SSID);

    switch (SecurityProtocol) {

      // WEP "security".
      case WEP:
        wifiConf.wepKeys[0] = "\"" + networkPassword + "\"";
        wifiConf.wepTxKeyIndex = 0;
        wifiConf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
        wifiConf.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);

        break;

      // WAP security. We have to set preSharedKey.
      case WPA2:
        wifiConf.preSharedKey = "\"" + networkPassword + "\"";
        wifiConf.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
        wifiConf.allowedProtocols.set(WifiConfiguration.Protocol.RSN); // For WPA2
        wifiConf.allowedProtocols.set(WifiConfiguration.Protocol.WPA); // For WPA
        wifiConf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
        wifiConf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_EAP);
        wifiConf.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
        wifiConf.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
        wifiConf.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
        wifiConf.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);

        break;

      case WPA:
        wifiConf.preSharedKey = "\"" + networkPassword + "\"";

      // Network without security.
      case OPEN_NETWORK:
        wifiConf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
        break;
    }

    // Add WiFi configuration to list of recognizable networks
    if ((networkId = wifiMgr.addNetwork(wifiConf)) == -1) {
      Log.i("TAG", "Failed to add network configuration!");
      return false;
    }

    // Disconnect from current WiFi connection
    if (!disconnectFromWifi()) {
      Log.i("TAG", "Failed to disconnect from network!");
      return false;
    }

    // Enable network to be connected
    if (!wifiMgr.enableNetwork(networkId, true)) {
      Log.i("TAG", "Failed to enable network!");
      return false;
    }

    // Connect to network
    if (!wifiMgr.reconnect()) {
      Log.i("TAG", "Failed to connect!");
      return false;
    }

    return true;
  }

But when I call this function to connect to the selected Wi-Fi, I always get false! I debugged it many times, and it goes to the first ifin this method AND does not connect to Wi-Fi.

Please help me with your answers. Thank.