Android WifiManager and Scanning Battery Performance -

to understanding, 1 can request wifimanager start ap scan, great , scan results back, question regarding continuous wifi scan happens under hood.

aside unregistering wifi listener scan callback, disabling wifi way stop hardware scanning? if device connected wifi bssid/ssid it's scanning? (yes http://www.androidauthority.com/community/threads/how-to-get-wifi-to-stop-scanning-after-connected.7760/) if request scan while connected wifi, starts scan since there's no way stop scanning without turning off hardware... @ point lose connectivity wifi network, not acceptable.

seems oversight google. why didn't leave hardware alone rather make scan?! unless provoked start scanning, connect, disconnect, or stop scanning, not on own... why didn't implement way? concern battery drainage continuous scanning... whether or not have listener irrelevant. fact hardware querying nearby networks sounds pretty resource , battery intensive.

is there 1 can in case without rooting?