鴻蒙OS WLAN消息通知

場景介紹

WLAN 消息通知（Notification）是 HarmonyOS 內(nèi)部或者與應(yīng)用之間跨進(jìn)程通訊的機(jī)制，注冊者在注冊消息通知后，一旦符合條件的消息被發(fā)出，注冊者即可接收到該消息并獲取消息中附帶的信息。

接口說明

開發(fā)步驟

1. 構(gòu)建消息通知接收者 WifiEventSubscriber。

1. 注冊 WLAN 變化消息。

1. WifiEventSubscriber 接收并處理 WLAN 廣播消息。

   // 構(gòu)建消息接收者/注冊者
   class WifiEventSubscriber extends CommonEventSubscriber {
       WifiEventSubscriber (CommonEventSubscribeInfo info) {
           super(info);
       }

    
       @Override
       public void onReceiveEvent(CommonEventData commonEventData) {
           if (WifiEvents.EVENT_ACTIVE_STATE.equals(commonEventData.getIntent().getAction())) {
               // 獲取附帶參數(shù)
               IntentParams params = commonEventData.getIntent().getParams();
               if (params == null) {
                   return;
               }
               int wifiState= (int) params.getParam(WifiEvents.PARAM_ACTIVE_STATE);

               
               if (wifiState== WifiEvents.STATE_ACTIVE) { // 處理WLAN被打開消息
                   HiLog.info(LABEL, false, "Receive WifiEvents.STATE_ACTIVE %{public}d", wifiState);
               } else if (wifiState == WifiEvents.STATE_INACTIVE) { // 處理WLAN被關(guān)閉消息  
                   HiLog.info(LABEL, false, "Receive WifiEvents.STATE_INACTIVE %{public}d", wifiState);
               } else { // 處理WLAN異常狀態(tài)
                   HiLog.info(LABEL, false, "Unknown wifi state");
               }
           }
       }
   }

    
   // 注冊消息
   MatchingSkills match = new MatchingSkills();
   // 增加獲取WLAN狀態(tài)變化消息
   filter.addEvent(WifiEvents.EVENT_ACTIVE_STATE);
   CommonEventSubscribeInfo subscribeInfo = new CommonEventSubscribeInfo(match);
   subscribeInfo.setPriority(100); 
   WifiEventSubscriber subscriber = new WifiEventSubscriber(subscribeInfo);

    
   try {
       CommonEventManager.subscribeCommonEvent(subscriber);
   } catch (RemoteException e) {
       HiLog.warn(LABEL, false, "subscribe in wifi events failed!");
   }