ibeacon

I'm currently working on an app that I want for my app to detect a beacon in background mode just when it gets close to it(Immediate). Based on articles that I've read it cannot be done with didEnterRegion and I should use ranging while it's running in the background mode(Location Update). is there any solution that directly reduces the didEnterRegion threshold? or Should I use the other method? and if that's the case does it work like didEnterRegion but with a limited range of RSSI? does it work when my phone entered the region and it's locked and the screen is off? Monitoring APIs give you

Checked following post but not helpful on my case : BluetoothDevice always returns null on getName() My problem I am developing an application that scans the nearby Bluetooth device and displays in the home screen.But on few devices(i.e moto G,samsung note2) the device name is null on leScanCallback. My code private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { @Override public void onLeScan(final BluetoothDevice device, final int rssi, byte[] scanRecord) { if (device.getName() != null){//<<- Here it null on few device //my process } } }; Note: I