ScanInteractor.java

public class ScanInteractor {

	private final DevicesManager devicesManager;

	public ScanInteractor() {
		devicesManager = DevicesManager.getInstance();
	}

	public Observable<ScanResultData> getDevices() {
		return devicesManager
				.getDevices()
				.map(ScanResultData::new);
	}

	public void stopScan() {
		devicesManager.stopScan();
	}
}

ScanResultData.java

package com.arellomobile.bleworker.mvp.presentation.data;

import java.util.List;

import com.polidea.rxandroidble.RxBleDevice;

/**
 * Date: 17.02.2017
 * Time: 13:11
 *
 * @author Yuri Shmakov
 */

public class ScanResultData {
	private List<RxBleDevice> bleDevices;

	public ScanResultData(List<RxBleDevice> devices) {
		this.bleDevices = devices;
	}

	public int size() {
		return bleDevices.size();
	}

	public Device get(int position) {
		return new Device(bleDevices.get(position));
	}

	public class Device {
		private RxBleDevice device;

		private Device(RxBleDevice device) {
			this.device = device;
		}

		public String getMacAddress() {
			return device.getMacAddress();
		}

		public String getName() {
			return device.getName();
		}
	}
}

ScanResultsAdapter.java

public class ScanResultsAdapter extends BaseAdapter {

	private ScanResultData data;

	public ScanResultsAdapter() {
		this.data = new ScanResultData(Collections.emptyList());
	}

	public void setData(ScanResultData data) {
		this.data = data;

		notifyDataSetChanged();
	}

	@Override
	public int getCount() {
		return data.size();
	}

	@Override
	public ScanResultData.Device getItem(int position) {
		return data.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// inflate view
		return new View();
	}
}