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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                WifiService構造函數的代碼如下所示。 **WifiService.java::WifiService構造函數** ~~~ WifiService(Context context) { mContext = context; // 從系統屬性“wifi.interface”中取出無線網絡設備接口名。默認值為“wlan0” mInterfaceName = SystemProperties.get("wifi.interface", "wlan0"); // 創建一個WifiStateMachine對象,它是WifiService相關模塊中的核心 mWifiStateMachine = new WifiStateMachine(mContext, mInterfaceName); /* RSSI輪詢機制。RSSI為Receive Signal Strength Indication(接收信號強度指示) 的縮寫,它反映了無線網絡質量的好壞。WPAS支持的RSSI信息包括:接收信號強度、連接速度 (link speed)噪聲強度(noise)和頻率。在WPAS中,RSSI信息由wpa_signal_info 結構體來表達。 */ mWifiStateMachine.enableRssiPolling(true); // 和BatteryStatsService交互。感興趣的讀者可閱讀《深入理解Android:卷Ⅱ》5.5.2節 mBatteryStats = BatteryStatsService.getService(); ......// 廣播事件注冊等處理。由于篇幅問題,本章將略去一些重要程度較低的代碼 HandlerThread wifiThread = new HandlerThread("WifiService"); wifiThread.start(); // mAsyncServiceHandler用于AsyncChannel,其交互對象來自WifiManager mAsyncServiceHandler = new AsyncServiceHandler(wifiThread.getLooper()); // mWifiStateMachineHandler也用于AsyncChannel,其交互對象來自WifiStateMachine mWifiStateMachineHandler = new WifiStateMachineHandler(wifiThread.getLooper()); ......// 其他一些工作 } ~~~ WifiService構造函數中主要工作是創建一些核心對象,其中: * WifiStateMachine是WifiService中的核心,是本章分析的重點對象。 * mAsyncServiceHandler和mWifiStateMachineHandler都和AsyncChannel相關,與它們交互的Handler分別位于WifiManager和WifiStateMachine中。 馬上來看最重要的WifiStateMachine。
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