Get the nearby location from the data in SQLite Android

I am creating an app composed of google map and listview of places under the map. I decided to add a button wherein if the user clicks it, nearby location will appear based on the location of the user in listview and the markers will appear in the map. I dont have an idea how to do it. Btw ill post my codes below.

public class MainActivity extends AppCompatActivity implements LocationListener {

    GoogleMap map;

    List<LocationModel> GetLocation;
    Context context = this;
    DatabaseHelper dbhelper;
    DatabaseHelper db = new DatabaseHelper(this);
    ListView lv;
    View yourListView,yourProfileView;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        dbhelper = new DatabaseHelper(MainActivity.this);

        try{
            dbhelper.createDataBase();
        }
        catch(IOException e){
            e.printStackTrace();
        }
        try {
            dbhelper.openDataBase();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        GetLocation = dbhelper.getLocation();
        lv = (ListView) findViewById(R.id.listView);
        lv.setAdapter(new ViewAdapter());

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

                LatLng latlngtofocus = new LatLng(Double.parseDouble(GetLocation.get(i).getlatitude()),  Double.parseDouble(GetLocation.get(i).getlongitude()));

                map.animateCamera(CameraUpdateFactory.newLatLngZoom(latlngtofocus, 17.0f));

                MarkerOptions markerOptions = new MarkerOptions();
                markerOptions.position(latlngtofocus);
                //adding marker to the map
                map.addMarker(markerOptions);


                yourListView = findViewById(R.id.layout);
                ViewGroup parent = (ViewGroup) yourListView.getParent();
                parent.removeView(yourListView);
// inflate your profile view (or get the reference to it if it's already inflated)
                yourProfileView = getLayoutInflater().inflate(R.layout.profile_location, parent, false);
// add it to the parent
                parent.addView(yourProfileView);

            }


        });



        //To get MapFragment reference from xml layout
        MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map);

        //To get map object
        map = mapFragment.getMap();
        map.getUiSettings().setZoomControlsEnabled(true);

       /* //to show current location in the map
        map.setMyLocationEnabled(true);

        map.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
            @Override
            public void onMapClick(LatLng latLng) {

                Toast.makeText(getApplicationContext(), latLng.toString(), Toast.LENGTH_LONG).show();
            }
        });*/

        //To setup location manager
        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        //To request location updates
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1, 1, this);

    }


    @Override
    public void onLocationChanged(Location location) {

        //To clear map data
        map.clear();

        //To hold location
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());

        //To create marker in map
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("My Location");
        //adding marker to the map
        map.addMarker(markerOptions);

        //opening position with some zoom level in the map
        map.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 17.0f));
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }

    /****************************************************************************************
     *                                      CUSTOM LIST
     ****************************************************************************************/
    public class ViewAdapter extends BaseAdapter {

        LayoutInflater mInflater;

        public ViewAdapter() {
            mInflater = LayoutInflater.from(context);
        }

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

        @Override
        public Object getItem(int position) {
            return null;
        }

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

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {

            if (convertView == null) {
                convertView = mInflater.inflate(R.layout.item_location,null);
            }

            final TextView country = (TextView) convertView.findViewById(R.id.location);
            final TextView latitude = (TextView) convertView.findViewById(R.id.latitude);
            final TextView longitude = (TextView) convertView.findViewById(R.id.longitude);

            location.setText(GetLocation.get(position).getlocation());
            latitude.setText(GetLocation.get(position).getlatitude());
            longitude.setText(GetLocation.get(position).getlongitude());

            return convertView;
        }
    }

    @Override
    public void onBackPressed() {
        if(yourProfileView != null && yourProfileView.getParent() != null) {
            // remove your profile view
            ViewGroup parent = (ViewGroup) yourProfileView.getParent();
            parent.removeView(yourProfileView);

            // a reference to yourListView has to be saved somewhere; just get it

            // add your listview to the parent
            parent.addView(yourListView);
        } else {
            super.onBackPressed();
        }
    }

}