我试图使用getRssi()获取当前wifi连接的信号强度
private void checkWifi(){ ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo Info = cm.getActiveNetworkInfo(); if (Info == null || !Info.isConnectedOrConnecting()) { Log.i("WIFI CONNECTION","No connection"); } else { int netType = Info.getType(); int netSubtype = Info.getSubtype(); if (netType == ConnectivityManager.TYPE_WIFI) { wifiManager = (WifiManager)getApplicationContext().getSystemService(Context.WIFI_SERVICE); int linkSpeed = wifiManager.getConnectionInfo().getLinkSpeed(); int rssi = wifiManager.getConnectionInfo().getRssi(); Log.i("WIFI CONNECTION","Wifi connection speed: "+linkSpeed + " rssi: "+rssi); //Need to get wifi strength } } }
事情是我得到像-35或-47等数字…我不明白他们的价值观..我已经看了android文档及其所有状态:
public int getRssi ()
Since: API Level 1 Returns the received signal strength indicator of
the current 802.11 network.This is not normalized,but should be!
Returns the RSSI,in the range ??? to ???
谁能解释如何“正常化”或理解这些结果?
解决方法
根据IEEE 802.11文档:较小的负值表示较高的信号强度.
范围在-100到0 dBm之间,接近0是强度更高,反之亦然.
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