android - iBeacons' background ranging with Altbeacon Library -

i need range beacons on background using altbeacons library(work on foreground mode)

on android monitor log never shows message didrangebeaconsinregion method.

on didenterregion, messages displayed correctly.

i tried code below no success, can 1 guide me how it?

public class inbeaconapplication extends application implements bootstrapnotifier, rangenotifier { private beaconmanager beaconmanager; private arraylist<inbeacon> userbeaconarraylist; private inbeaconuser inbeaconuser;  @override public void oncreate() {     super.oncreate();     log.d("inbeacon", "application created");      //beaconmanager , custom beaconparser layout     beaconmanager = beaconmanager.getinstanceforapplication(this);     beaconmanager.getbeaconparsers().clear();     beaconmanager.getbeaconparsers().add(new beaconparser()             .setbeaconlayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24"));     beaconmanager.setregionstateperistenceenabled(false);      //set beacommanager background between scan periods     long period = 1000 * 30; //equal 30 seconds     beaconmanager.setbackgroundbetweenscanperiod(period);      // wake app when beacon seen     region region = new region(utils.region_id, identifier             .parse(utils.inbeacon_uuid), null, null);     new regionbootstrap(this, region);      new backgroundpowersaver(this); }    boolean checkpermissionforrange(){     if (build.version.sdk_int >= build.version_codes.m) {         return getapplicationcontext().checkselfpermission(                 manifest.permission.access_fine_location) != packagemanager.permission_granted;     }     return true; }  @override public void didenterregion(region region) {     log.d("inbeacon", "didenterregion");     utils.sendnotification(this, "test");     if (checkpermissionforrange()) return;     log.d("inbeacon", "permissions ok");     try {         beaconmanager.startrangingbeaconsinregion(region);         log.d("inbeacon","startranging");     } catch (remoteexception e) {         log.e("inbeacon",e.getmessage());     } }  @override public void didexitregion(region region) {     log.d("inbeacon", "didexitregion");     try {         beaconmanager.stoprangingbeaconsinregion(region);     } catch (remoteexception e) {         e.printstacktrace();     } }  @override public void didrangebeaconsinregion(collection<beacon> collection, region region) {     log.d("inbeacon", "didrangebeaconsinregion");     arraylist<beacon> newbeacons = new arraylist<>(collection);       .............code need beacons..... } 

it looks code needs call:

 beaconmanager.setrangenotifier(this);