Android 12 Captive Portal Wifi 流程

Amine.Liao

已于 2022-11-22 16:06:33 修改

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分类专栏： Android Wifi 模块文章标签： android

于 2022-11-14 16:57:21 首次发布

本文链接：https://blog.youkuaiyun.com/TSK_Amine/article/details/127850677

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本文详细介绍了在Android 12中，当用户选择Wi-Fi接入点（SSID）时，系统进行的Captive Portal（门户网络）检测过程。涉及的组件包括Settings应用、ConnectivityService、ClientModeImpl和NetworkMonitor等。通过HTTP状态码检查（如204无内容）来判断网络是否可用，并提供了AOSP的测速URL和各种状态码的含义，包括临时响应、成功、重定向和请求错误等情况。

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**
* “*[]” 表示文件名
* “├──” 表示文件内的对象，方法等
* “└──” 表示下一步执行
**
一、Settings wifi 列表选择AP SSID
packages/apps/Settings/src/com/android/settings/wifi/WifiSettings.java
frameworks/opt/net/wifi/libs/WifiTrackerLib/src/com/android/wifitrackerlib/WifiEntry.java
frameworks/opt/net/wifi/libs/WifiTrackerLib/src/com/android/wifitrackerlib/StandardWifiEntry.java
packages/apps/Settings/src/com/android/settings/wifi/details2/WifiDetailPreferenceController2.java
packages/modules/Connectivity/framework/src/android/net/ConnectivityManager.java
packages/modules/Connectivity/service/src/com/android/server/ConnectivityService.java

**[WifiSettings.java]

├──updateWifiEntryPreferences()
   └──if (connectedEntry.canSignIn()) //判断是否已认证登录
         └──connectedEntry.signIn(null /* callback */);//connect 方式一，selected 后直接sign in
         |
         **[StandardWifiEntry.java]-->[WifiEntry.java]
         ├──canSignIn()
            └──return mNetworkCapabilities != null && mNetworkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL);
         ├──signIn(@Nullable SignInCallback callback)
            └──((ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE)).startCaptivePortalApp(mWifiManager.getCurrentNetwork());//启动认证APP：CaptivePortalLogin
   └──else
         └──launchNetworkDetailsFragment(pref);//connect 方式二，selected 后进入详情界面
         |
         **[WifiDetailPreferenceController2.java]
         ├──updateCaptivePortalButton()
            └──signIntoNetwork()
               └──mWifiEntry.signIn(this)
               |
               *[StandardWifiEntry.java]-->[WifiEntry.java]
               ├──canSignIn()
                  └──return mNetworkCapabilities != null && mNetworkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL);
               ├──signIn(@Nullable SignInCallback callback)
                  └──((ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE)).startCaptivePortalApp(mWifiManager.getCurrentNetwork());//启动认证APP：CaptivePortalLogin
                  **[ConnectivityManager.java]
                  ├──startCaptivePortalApp(Network network)//ConnectivityService.java
                     └──if (!nai.networkCapabilities.hasCapability(NET_CAPABILITY_CAPTIVE_PORTAL)) return;
                     └──nai.networkMonitor().launchCaptivePortalApp();
                        |
                        **[NetworkMonitor.java]
                        ├──launchCaptivePortalApp()
                           └──sendMessage(CMD_LAUNCH_CAPTIVE_PORTAL_APP)
                              └──clase:MaybeNotifyState
                                 └──processMessage(Message message)
                                    └──case CMD_LAUNCH_CAPTIVE_PORTAL_APP:
                                       └──mCm.startCaptivePortalApp(network, appExtras);
                                       |
                                       **[ConnectivityManager.java]
                                       ├──startCaptivePortalApp(@NonNull Network network, @NonNull Bundle appExtras)
                                          └──startCaptivePortalAppInternal(network, appExtras)//ConnectivityService.java
                                             └──final Intent appIntent = new Intent(ConnectivityManager.ACTION_CAPTIVE_PORTAL_SIGN_IN);
                                                mContext.startActivityAsUser(appIntent, UserHandle.CURRENT);

二、网络有效性检查
packages/modules/Wifi/service/java/com/android/server/wifi/Clie