getWifiDBM
Get wifi signal strength.
Return WIFIDBM.NOWIFICONNECT when wifi is disconnected or unable or return WIFIDBM.UNSPECIFIED when can't get the strength of wifi.
When the Build.VERSION.SDK_INT is under Build.VERSION_CODES.S,the signal strength of WIFIDBM.CURRENTDBM is represented by 0-4, otherwise the signal strength of WIFIDBM.CURRENTDBM is represented by 0-WifiManager.getMaxSignalLevel.
Since
0.5.3
Throws
Throw this exception if there is no ACCESS_WIFI_STATE permission.