bluetooth - Android BluetoothAdapter.CancelDiscovery doesn't cancel discovery -


i have discovery status hooked broadcast receiver. can start scan , let stop after default timeout of 12 seconds, , i'll both discoverystarted , discoveryfinished actions. running code

_bluetoothadapter.canceldiscovery();

does not anything. 12 seconds later, discoveryfinished action after times out. how can force thing stop scanning? slowing down bluetooth connection process.

here broadcast receiver subscription:

filter.addaction(bluetoothdevice.actionfound); filter.addaction(bluetoothdevice.actionbondstatechanged); filter.addaction(bluetoothadapter.actiondiscoverystarted); filter.addaction(bluetoothadapter.actiondiscoveryfinished); context.registerreceiver(_bluetoothdevicereceiver, filter);

and handler:

public override void onreceive(context context, intent intent)     {         string action = intent.action;          if (action == bluetoothdevice.actionfound)         {             bluetoothdevice newdevice = (bluetoothdevice)intent.getparcelableextra(bluetoothdevice.extradevice);             interlocked.compareexchange(ref devicefound, null, null)?.invoke(newdevice);         }          if (action == bluetoothdevice.actionbondstatechanged)         {             bluetoothdevice newdevice = (bluetoothdevice)intent.getparcelableextra(bluetoothdevice.extradevice);             if (newdevice.bondstate == bond.bonded)             {                 interlocked.compareexchange(ref bondcomplete, null, null)?.invoke(newdevice);             }         }          if (action == bluetoothdevice.actionacldisconnected || action == bluetoothdevice.actionacldisconnectrequested)         {             interlocked.compareexchange(ref disconnected, null, null)?.invoke();         }          if (action == bluetoothadapter.actiondiscoverystarted)         {             interlocked.compareexchange(ref scanningstatechanged, null, null)?.invoke(true);         }           if (action == bluetoothadapter.actiondiscoveryfinished)         {             interlocked.compareexchange(ref scanningstatechanged, null, null)?.invoke(false);         }     }


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