在 WifiConfigManager 中通过 createNewInternalWifiConfigurationFromExternal 创建新的 WifiConfiguration 配置项，并且创建合法的 networkId 信息，通过 mNextNetworkId 参数递增的方式对新创建的 Network 赋值 Id；
创建过程发生在 addOrUpdateNetworkInternal 接口中，进行网络的添加，其中传入的 config 为空或者是新的 config 信息，networkId 为 INVALID 的；
addOrUpdateNetworkInternal 的调用者很多，从新添加网络的方向来看是 addOrUpdateNetwork 接口，同属于 WifiConfigManager 类，而同样它也有多个调用者；
添加新网络的调用者为 ClientModeImpl 类中的 connect 接口，而它的调用者为 WifiServiceImpl 的 connect 接口：

    /*** see {@link android.net.wifi.WifiManager#connect(int, WifiManager.ActionListener)}*/@Overridepublic void connect(WifiConfiguration config, int netId, IBinder binder,@Nullable IActionListener callback, int callbackIdentifier) {int uid = Binder.getCallingUid();if (!isPrivileged(Binder.getCallingPid(), uid)) {throw new SecurityException(TAG + ": Permission denied");}mLog.info("connect uid=%").c(uid).flush();mClientModeImpl.connect(config, netId, binder, callback, callbackIdentifier, uid);if (mWifiPermissionsUtil.checkNetworkSettingsPermission(uid)) {mWifiMetrics.logUserActionEvent(UserActionEvent.EVENT_MANUAL_CONNECT, netId);}}

其调用为通过 binder 服务在 WifiManager 中发生，其中通过 connect 接口进行连接过程访问，而 connect 接口通过 connectInternal 接口调用了 mService.connect，即访问到 WifiServiceImpl 中对应的方法：

    private void connectInternal(@Nullable WifiConfiguration config, int networkId,@Nullable ActionListener listener) {ActionListenerProxy listenerProxy = null;Binder binder = null;if (listener != null) {listenerProxy = new ActionListenerProxy("connect", mLooper, listener);binder = new Binder();}try {mService.connect(config, networkId, binder, listenerProxy,listener == null ? 0 : listener.hashCode());} catch (RemoteException e) {if (listenerProxy != null) listenerProxy.onFailure(ERROR);} catch (SecurityException e) {if (listenerProxy != null) listenerProxy.onFailure(NOT_AUTHORIZED);}}/*** Connect to a network with the given configuration. The network also* gets added to the list of configured networks for the foreground user.** For a new network, this function is used instead of a* sequence of addNetwork(), enableNetwork(), and reconnect()** @param config the set of variables that describe the configuration,*            contained in a {@link WifiConfiguration} object.* @param listener for callbacks on success or failure. Can be null.* @throws IllegalStateException if the WifiManager instance needs to be* initialized again** @hide*/@SystemApi@RequiresPermission(anyOf = {android.Manifest.permission.NETWORK_SETTINGS,android.Manifest.permission.NETWORK_SETUP_WIZARD,android.Manifest.permission.NETWORK_STACK})public void connect(@NonNull WifiConfiguration config, @Nullable ActionListener listener) {if (config == null) throw new IllegalArgumentException("config cannot be null");connectInternal(config, WifiConfiguration.INVALID_NETWORK_ID, listener);}/*** Connect to a network with the given networkId.** This function is used instead of a enableNetwork() and reconnect()** <li> This API will cause reconnect if the credentials of the current active* connection has been changed.</li>* <li> This API will cause reconnect if the current active connection is marked metered.</li>** @param networkId the ID of the network as returned by {@link #addNetwork} or {@link*        getConfiguredNetworks}.* @param listener for callbacks on success or failure. Can be null.* @throws IllegalStateException if the WifiManager instance needs to be* initialized again* @hide*/@SystemApi@RequiresPermission(anyOf = {android.Manifest.permission.NETWORK_SETTINGS,android.Manifest.permission.NETWORK_SETUP_WIZARD,android.Manifest.permission.NETWORK_STACK})public void connect(int networkId, @Nullable ActionListener listener) {if (networkId < 0) throw new IllegalArgumentException("Network id cannot be negative");connectInternal(null, networkId, listener);}

到用户界面层面的调用发生在 StandardWifiEntry 类中，其中调用了 connect 接口，通过 mWifiManager 的 connect 接口调用进行网络连接：

    @Overridepublic void connect(@Nullable ConnectCallback callback) {mConnectCallback = callback;// We should flag this network to auto-open captive portal since this method represents// the user manually connecting to a network (i.e. not auto-join).mShouldAutoOpenCaptivePortal = true;if (isSaved() || isSuggestion()) {// Saved/suggested networkmWifiManager.connect(mWifiConfig.networkId, new ConnectActionListener());} else {// Unsaved networkif (mSecurity == SECURITY_NONE|| mSecurity == SECURITY_OWE) {// Open networkfinal WifiConfiguration connectConfig = new WifiConfiguration();connectConfig.SSID = "\"" + mSsid + "\"";if (mSecurity == SECURITY_OWE) {// Use OWE if possibleconnectConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.OWE);connectConfig.requirePmf = true;} else {connectConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);}mWifiManager.connect(connectConfig, new ConnectActionListener());} else {// Secure networkif (callback != null) {mCallbackHandler.post(() ->callback.onConnectResult(ConnectCallback.CONNECT_STATUS_FAILURE_NO_CONFIG));}}}}

上述对 Unsaved Network 的处理过程中通过 ssid 和 password 信息构建网络配置，以 INVALID 类型的 networkId 信息设定传下来进行连接；
这里的 connect 调用发生在 WifiSettings2 中的connect 中，进而是在 onSubmit 接口中被调用，或者在 onPreferenceTreeClick 中被调用，从而进行编辑获取信息下发进行配置

    @Overridepublic void onSubmit(WifiDialog2 dialog) {final int dialogMode = dialog.getMode();final WifiConfiguration config = dialog.getController().getConfig();final WifiEntry wifiEntry = dialog.getWifiEntry();if (dialogMode == WifiConfigUiBase2.MODE_MODIFY) {if (config == null) {Toast.makeText(getContext(), R.string.wifi_failed_save_message,Toast.LENGTH_SHORT).show();} else {mWifiManager.save(config, mSaveListener);}} else if (dialogMode == WifiConfigUiBase2.MODE_CONNECT|| (dialogMode == WifiConfigUiBase2.MODE_VIEW && wifiEntry.canConnect())) {if (config == null) {connect(wifiEntry, false /* editIfNoConfig */,false /* fullScreenEdit*/);} else {mWifiManager.connect(config, new WifiConnectActionListener());}}}@VisibleForTestingvoid connect(WifiEntry wifiEntry, boolean editIfNoConfig, boolean fullScreenEdit) {mMetricsFeatureProvider.action(getActivity(), SettingsEnums.ACTION_WIFI_CONNECT,wifiEntry.isSaved());// If it's an unsaved secure WifiEntry, it will callback// ConnectCallback#onConnectResult with ConnectCallback#CONNECT_STATUS_FAILURE_NO_CONFIGwifiEntry.connect(new WifiEntryConnectCallback(wifiEntry, editIfNoConfig,fullScreenEdit));}

扫描结果接收到 UI 层

在 BaseWifiTracker 类中创建了 BroadcastReceiver 类对象 mBroadcastReceiver 来接收广播信息，其中的 onReceive 接口处理及收到的广播，其中对 WifiManager.WIFI_STATE_CHANGED_ACTION 广播进行处理；
其中会进行 notifyOnWifiStateChanged 和 handleWifiStateChangedAction 操作；
在继承类 WifiPickerTracker 中进行 handleWifiStateChangedAction 的重载，进行了 updateWifiEntries 调用更新了 WifiEntry 信息；
在上述的更新过程中都会推后调用 onWifiEntriesChanged 接口，而在 WifiSettings2 类中它被重载：

    @Overridepublic void onWifiEntriesChanged() {updateWifiEntryPreferencesDelayed();changeNextButtonState(mWifiPickerTracker.getConnectedWifiEntry() != null);// Edit the Wi-Fi network of specified SSID.if (mOpenSsid != null) {Optional<WifiEntry> matchedWifiEntry = mWifiPickerTracker.getWifiEntries().stream().filter(wifiEntry -> TextUtils.equals(mOpenSsid, wifiEntry.getSsid())).filter(wifiEntry -> wifiEntry.getSecurity() != WifiEntry.SECURITY_NONE&& wifiEntry.getSecurity() != WifiEntry.SECURITY_OWE).filter(wifiEntry -> !wifiEntry.isSaved()|| isDisabledByWrongPassword(wifiEntry)).findFirst();if (matchedWifiEntry.isPresent()) {mOpenSsid = null;launchConfigNewNetworkFragment(matchedWifiEntry.get());}}}

上述调用过程让更新到的 WifiEntry 信息显示在用户界面。下面分析 BroadcastReceiver 接收的消息源。

在 ScanRequestProxy 类的实现中，调用了 sendScanResultBroadcast 直接将对应的 WifiManager.SCAN_RESULTS_AVAILABLE_ACTION 消息进行了广播，从而给用户界面层接收到；

sendScanResultBroadcast 在 GlobalScanListener 中的 onResults 接口中被调用，而其类对象在 ScanRequestProxy 类的 retrieveWifiScannerIfNecessary 接口中获取到 WifiScanner 对象时调用它进行创建，并且注册到了 WifiScanner 中；

从而在 WifiScanner 中通过 AsyncChannel 发送了 CMD_REGISTER_SCAN_LISTENER 消息到另一端 WifiScanningServiceImpl 中对相应的 Scan 结果进行监听，收取结果之后进行 ScanListener 的回调，实际发生在 ServiceHandler 内部类中进行 handleMessage 中的处理过程处理 CMD_SCAN_RESULT 过程中，对所有的 Listener 进行遍历并将相应的结果进行回调告知处理。

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Android WiFi 扫描并选择网络进行连接

扫描结果接收到 UI 层

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