鸿蒙OS WLAN消息通知
场景介绍
WLAN 消息通知（Notification）是 HarmonyOS 内部或者与应用之间跨进程通讯的机制，注册者在注册消息通知后，一旦符合条件的消息被发出，注册者即可接收到该消息并获取消息中附带的信息。
接口说明
| 描述 | 通知名 | 附加参数 |
|---|---|---|
| WLAN状态 | usual.event.wifi.POWER_STATE | active_state |
| WLAN扫描 | usual.event.wifi.SCAN_FINISHED | scan_state |
| WLAN RSSI变化 | usual.event.wifi.RSSI_VALUE | rssi_value |
| WLAN连接状态 | usual.event.wifi.CONN_STATE | conn_state |
| Hotspot状态 | usual.event.wifi.HOTSPOT_STATE | hotspot_active_state |
| Hotspot连接状态 | usual.event.wifi.WIFI_HS_STA_JOIN usual.event.wifi.WIFI_HS_STA_LEAVE | - |
| P2P状态 | usual.event.wifi.p2p.STATE_CHANGE | p2p_state |
| P2P连接状态 | usual.event.wifi.p2p.CONN_STATE_CHANGE | linked_infonet_infogroup_info |
| P2P设备列表变化 | usual.event.wifi.p2p.PEERS_STATE_CHANGE | peers_list |
| P2P搜索状态变化 | usual.event.wifi.p2p.PEER_DISCOVERY_STATE_CHANGE | peers_discovery |
| P2P当前设备变化 | usual.event.wifi.p2p.CURRENT_DEVICE_CHANGE | p2p_device |
| P2P群组信息变化 | usual.event.wifi.p2p.GROUP_STATE_CHANGED | - |
开发步骤
- 构建消息通知接收者 WifiEventSubscriber。
- 注册 WLAN 变化消息。
- WifiEventSubscriber 接收并处理 WLAN 广播消息。
// 构建消息接收者/注册者
class WifiEventSubscriber extends CommonEventSubscriber {
WifiEventSubscriber (CommonEventSubscribeInfo info) {
super(info);
}
@Override
public void onReceiveEvent(CommonEventData commonEventData) {
if (WifiEvents.EVENT_ACTIVE_STATE.equals(commonEventData.getIntent().getAction())) {
// 获取附带参数
IntentParams params = commonEventData.getIntent().getParams();
if (params == null) {
return;
}
int wifiState= (int) params.getParam(WifiEvents.PARAM_ACTIVE_STATE);
if (wifiState== WifiEvents.STATE_ACTIVE) { // 处理WLAN被打开消息
HiLog.info(LABEL, false, "Receive WifiEvents.STATE_ACTIVE %{public}d", wifiState);
} else if (wifiState == WifiEvents.STATE_INACTIVE) { // 处理WLAN被关闭消息
HiLog.info(LABEL, false, "Receive WifiEvents.STATE_INACTIVE %{public}d", wifiState);
} else { // 处理WLAN异常状态
HiLog.info(LABEL, false, "Unknown wifi state");
}
}
}
}
// 注册消息
MatchingSkills match = new MatchingSkills();
// 增加获取WLAN状态变化消息
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!");
}