wifiManager.addNetwork(WifiConfiguration);

/**
   * Add a new network description to the set of configured networks.
   * The {@code networkId} field of the supplied configuration object
   * is ignored.
   * <p/>
   * The new network will be marked DISABLED by default. To enable it,
   * called {@link #enableNetwork}.
   *
   * @param config the set of variables that describe the configuration,
   *      contained in a {@link WifiConfiguration} object.
   *      If the {@link WifiConfiguration} has an Http Proxy set
   *      the calling app must be System, or be provisioned as the Profile or Device Owner.
   * @return the ID of the newly created network description. This is used in
   *     other operations to specified the network to be acted upon.
   *     Returns {@code -1} on failure.
   *
   * @deprecated
   * a) See {@link WifiNetworkSpecifier.Builder#build()} for new
   * mechanism to trigger connection to a Wi-Fi network.
   * b) See {@link #addNetworkSuggestions(List)},
   * {@link #removeNetworkSuggestions(List)} for new API to add Wi-Fi networks for consideration
   * when auto-connecting to wifi.
   * <b>Compatibility Note:</b> For applications targeting
   * {@link android.os.Build.VERSION_CODES#Q} or above, this API will always return {@code -1}.
   */
  @Deprecated
  public int addNetwork(WifiConfiguration config) {
    if (config == null) {
      return -1;
    }
    config.networkId = -1;
    return addOrUpdateNetwork(config);
  }

public void test()
  {
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q)
    {
      NetworkSpecifier specifier =
          new WifiNetworkSpecifier.Builder()
              .setSsidPattern(new PatternMatcher("此處WiFi名稱", PatternMatcher.PATTERN_PREFIX))
              .setWpa2Passphrase("此處WiFi密碼")
              .build();
 
      NetworkRequest request =
          new NetworkRequest.Builder()
              .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
              .removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
              .setNetworkSpecifier(specifier)
              .build();
 
      ConnectivityManager connectivityManager = (ConnectivityManager)
          context.getSystemService(Context.CONNECTIVITY_SERVICE);
 
      ConnectivityManager.NetworkCallback networkCallback = new ConnectivityManager.NetworkCallback() {
        @Override
        public void onAvailable(Network network) {
          // do success processing here..
        }
 
        @Override
        public void onUnavailable() {
          // do failure processing here..
        }
      };
      connectivityManager.requestNetwork(request, networkCallback);
      // Release the request when done.
      // connectivityManager.unregisterNetworkCallback(networkCallback);
    }
  }