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                WifiService在SystemServer進程中被創建,代碼如下所示。 **SystemServer.java::ServerThread:run** ~~~ public void run(){ ...... try { wifi = new WifiService(context);// 創建一個WifiService對象 ServiceManager.addService(Context.WIFI_SERVICE, wifi); }...... try { connectivity = new ConnectivityService( context, networkManagement, networkStats, networkPolicy); ServiceManager.addService(Context.CONNECTIVITY_SERVICE, connectivity); ...... /* 檢查是否需要啟動Wi-Fi。如果關機前Wi-Fi是打開的,則重啟后Wi-Fi功能將在此函數中打開 該函數比較簡單,其中有一處涉及WifiWatchdogStateMachine的代碼。留待5.4節介紹。 */ wifi.checkAndStartWifi(); wifiP2p.connectivityServiceReady(); } ...... ...... } ~~~ 由上述代碼可知,SystemServer[^①]中和WifiService相關的只有兩處函數調用。其中,WifiService的創建是第一條分析路線的起點。 正式介紹WifiService之前,本節先介紹兩個基礎知識,分別是HSM(Hierarchical StateMachine,結構化狀態機)和AsyncChannel。 [^①]:對SystemServer感興趣的讀者不妨閱讀《深入理解Android:卷Ⅱ》第3章。
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