概述

在最近开发过程中需要获取当前wifi的SSID，目前网上一般推荐 mWifiManager.getConnectionInfo() 这个方法来进行获取，但是发现在Android12上这个方法已经被标记为过时，本着用最新方法的想法，决定使用推荐的新方法试试。

问题分析

一言不合看源码，既然该方法被标记为过时，那么应该也会有推荐的方法来使用，源码如下：

 /**//path:packages/modules/Wifi/framework/java/android/net/wifi/WifiManager.java* Return dynamic information about the current Wi-Fi connection, if any is active.* <p>** @return the Wi-Fi information, contained in {@link WifiInfo}.** @deprecated Starting with {@link Build.VERSION_CODES#S}, WifiInfo retrieval is moved to* {@link ConnectivityManager} API surface. WifiInfo is attached in* {@link NetworkCapabilities#getTransportInfo()} which is available via callback in* {@link NetworkCallback#onCapabilitiesChanged(Network, NetworkCapabilities)} or on-demand from* {@link ConnectivityManager#getNetworkCapabilities(Network)}.**</p>* Usage example:* <pre>{@code* final NetworkRequest request =*      new NetworkRequest.Builder()*      .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)*      .build();* final ConnectivityManager connectivityManager =*      context.getSystemService(ConnectivityManager.class);* final NetworkCallback networkCallback = new NetworkCallback() {*      ...*      {@literal @}Override*      void onAvailable(Network network) {}**      {@literal @}Override*      void onCapabilitiesChanged(Network network, NetworkCapabilities networkCapabilities) {*          WifiInfo wifiInfo = (WifiInfo) networkCapabilities.getTransportInfo();*      }*      // etc.* };* connectivityManager.requestNetwork(request, networkCallback); // For request* connectivityManager.registerNetworkCallback(request, networkCallback); // For listen* }</pre>* <p>* <b>Compatibility Notes:</b>* <li>Apps can continue using this API, however newer features* such as ability to mask out location sensitive data in WifiInfo will not be supported* via this API. </li>* <li>On devices supporting concurrent connections (indicated via* {@link #isStaConcurrencyForLocalOnlyConnectionsSupported()}, etc) this API will return* the details of the internet providing connection (if any) to all apps, except for the apps* that triggered the creation of the concurrent connection. For such apps, this API will return* the details of the connection they created. e.g. apps using {@link WifiNetworkSpecifier} will* trigger a concurrent connection on supported devices and hence this API will provide* details of their peer to peer connection (not the internet providing connection). This* is to maintain backwards compatibility with behavior on single STA devices.</li>* </p>*/@Deprecatedpublic WifiInfo getConnectionInfo() {try {return mService.getConnectionInfo(mContext.getOpPackageName(),mContext.getAttributionTag());} catch (RemoteException e) {throw e.rethrowFromSystemServer();}}

根据注释里的提示，谷歌推荐使用NetworkCallback监听网络状态的方法来获取wifi 的ssid，照着写一下，如下：

 final NetworkRequest request =new NetworkRequest.Builder().addTransportType(NetworkCapabilities.TRANSPORT_WIFI).build();final ConnectivityManager.NetworkCallback mNetworkCallback = new ConnectivityManager.NetworkCallback() {@Overridepublic void onAvailable(@NonNull Network network) {super.onAvailable(network);}@Overridepublic void onCapabilitiesChanged(@NonNull Network network, @NonNull NetworkCapabilities networkCapabilities) {super.onCapabilitiesChanged(network, networkCapabilities);WifiInfo wifiInfo = (WifiInfo) networkCapabilities.getTransportInfo();if (wifiInfo != null) {String ssid = wifiInfo.getSSID().replace("\"", "").replace("<", "").replace(">", ""));} }};private void requestNetwork() {mConnectivityManager.registerNetworkCallback(mRequest, mNetworkCallback);}private void unrequestNetwork() {mConnectivityManager.unregisterNetworkCallback(mNetworkCallback);}

本以为万事大吉，一切OK，没想到install以后拿到的ssid 一直是 unknow ssid。对于这种情况，第一想法是应用是否缺少权限？查看WifiInfo源码，发现在应用没有"Manifest.permission.ACCESS_FINE_LOCATION"权限时，ssid的确会返回Unknown Ssid。难道这就解决了？看了一下应用的清单文件，发现该有的权限配置都是有的。这~ 给我整不会了！
纠结了好几天，始终没有找到解决问题的办法。
偶然在查看NetworkCallback源码的时候好像发现了新大陆。

//path:packages/modules/Connectivity/framework/src/android/net/ConnectivityManager.java/*** Base class for {@code NetworkRequest} callbacks. Used for notifications about network* changes. Should be extended by applications wanting notifications.** A {@code NetworkCallback} is registered by calling* {@link #requestNetwork(NetworkRequest, NetworkCallback)},* {@link #registerNetworkCallback(NetworkRequest, NetworkCallback)},* or {@link #registerDefaultNetworkCallback(NetworkCallback)}. A {@code NetworkCallback} is* unregistered by calling {@link #unregisterNetworkCallback(NetworkCallback)}.* A {@code NetworkCallback} should be registered at most once at any time.* A {@code NetworkCallback} that has been unregistered can be registered again.*/public static class NetworkCallback {/*** No flags associated with this callback.* @hide*/public static final int FLAG_NONE = 0;/*** Use this flag to include any location sensitive data in {@link NetworkCapabilities} sent* via {@link #onCapabilitiesChanged(Network, NetworkCapabilities)}.* <p>* These include:* <li> Some transport info instances (retrieved via* {@link NetworkCapabilities#getTransportInfo()}) like {@link android.net.wifi.WifiInfo}* contain location sensitive information.* <li> OwnerUid (retrieved via {@link NetworkCapabilities#getOwnerUid()} is location* sensitive for wifi suggestor apps (i.e using {@link WifiNetworkSuggestion}).</li>* </p>* <p>* Note:* <li> Retrieving this location sensitive information (subject to app's location* permissions) will be noted by system. </li>* <li> Without this flag any {@link NetworkCapabilities} provided via the callback does* not include location sensitive info.* </p>*/// Note: Some existing fields which are location sensitive may still be included without// this flag if the app targets SDK < S (to maintain backwards compatibility).public static final int FLAG_INCLUDE_LOCATION_INFO = 1 << 0;/** @hide */@Retention(RetentionPolicy.SOURCE)@IntDef(flag = true, prefix = "FLAG_", value = {FLAG_NONE,FLAG_INCLUDE_LOCATION_INFO})public @interface Flag { }/*** All the valid flags for error checking.*/private static final int VALID_FLAGS = FLAG_INCLUDE_LOCATION_INFO;public NetworkCallback() {this(FLAG_NONE);}public NetworkCallback(@Flag int flags) {if ((flags & VALID_FLAGS) != flags) {throw new IllegalArgumentException("Invalid flags");}mFlags = flags;}...

发现NetworkCallback的构造方法中是可以传参数的，并且根据注释可知 FLAG_INCLUDE_LOCATION_INFO 这个flag就是控制onCapabilitiesChanged时 NetworkCapabilities#getTransportInfo() 可以传递一些敏感的位置信息，而获取WifiInfo中的ssid的确需要位置信息。似乎？这就是正解？赶紧加进去试试。

final ConnectivityManager.NetworkCallback mNetworkCallback = new ConnectivityManager.NetworkCallback(ConnectivityManager.NetworkCallback.FLAG_INCLUDE_LOCATION_INFO) {@Overridepublic void onAvailable(@NonNull Network network) {super.onAvailable(network);}@Overridepublic void onCapabilitiesChanged(@NonNull Network network, @NonNull NetworkCapabilities networkCapabilities) {super.onCapabilitiesChanged(network, networkCapabilities);WifiInfo wifiInfo = (WifiInfo) networkCapabilities.getTransportInfo();if (wifiInfo != null) {String ssid = wifiInfo.getSSID().replace("\"", "").replace("<", "").replace(">", ""));} }};

方法相同就是在创建NetworkCallback 时传入FLAG_INCLUDE_LOCATION_INFO。
编译，install，打开应用，ssid完美呈现。
至此问题解决，这就是正解。

总结

遇事不决阅读源码，百思不解可读源码。

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Android12 (S) 获取wifi名称（SSID）的方法

目录

概述

问题分析

总结

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