使用 volley 在 google map v2 上添加多个标记

Question

我知道我站在正确的地方就我的案例研究寻求帮助，然后几天后我在考虑是否可以使用 Volley 库将数据存储到 MapFragment 但不幸的是直到现在我找不到解决方案。一般 MapFragment 使用 AsycnTask （如果我错了请教我）。为什么我使用 Volley 库，因为完全可以获取/发布数据客户端服务器。您能否给我一些线索或实施如何解决我的问题。提前致谢

public class MapTestFragment extends Fragment {

    private static final String TAG = MapTestFragment.class.getSimpleName();
    private static final String url = "myurl";

    private List<MapEntity> mbList = new ArrayList<MapEntity>();
    private GoogleMap googleMap;
    static final LatLng Location = new LatLng(-1.782877, 90.381806);
    Marker mark;
    private MapTestAdapter adapter;
    private HashMap<Marker, MapEntity> mMarkersHashMap;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View rootView = inflater.inflate(R.layout.fragment_map, container, false);

        getLatLang();
        mMarkersHashMap = new HashMap<Marker, MapEntity>();
        try {
            // Loading map
            initilizeMap();
            plotMarkers(mbList);

        } catch (Exception e) {
            e.printStackTrace();
        }
        return rootView;
    }

    private void getLatLang() {
        JsonArrayRequest mapReq = new JsonArrayRequest(url, 
                new Response.Listener<JSONArray>() {

                    @Override
                    public void onResponse(JSONArray response) {
                        // TODO Auto-generated method stub
                        Log.d(TAG, response.toString());
                        for (int i = 0; i < response.length(); i++) {
                            try {
                                JSONObject obj = response.getJSONObject(i);
                                MapEntity mb = new MapEntity();

                                mb.setTitle(obj.getString("title"));
                                mb.setLat(((Number) obj.get("lat"))
                                        .doubleValue());
                                mb.setLang(((Number) obj.get("lang"))
                                        .doubleValue());
                                mb.setThumbnail(obj.getString("thumbnail"));

                                mbList.add(mb);

                            } catch (Exception e) {
                                // TODO: handle exception
                                e.printStackTrace();
                            }
                        }
                        adapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {

                    @Override
                    public void onErrorResponse(VolleyError error) {
                        // TODO Auto-generated method stub
                        VolleyLog.d(TAG, "Error: " + error.getMessage());
                    }
                });
        AppController.getInstance().addToRequestQueue(mapReq);

    }

    private void initilizeMap() {
        if (googleMap == null) {
            googleMap = ((MapFragment) getActivity().getFragmentManager()
                    .findFragmentById(R.id.map)).getMap();

            if (googleMap != null) {
                googleMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {

                    @Override
                    public boolean onMarkerClick(Marker marker) {
                        // TODO Auto-generated method stub
                        marker.showInfoWindow();
                        return true;
                    }
                });
            }
            else {
                Toast.makeText(getActivity(),
                        "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                        .show();
            }
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        initilizeMap();
    }

    private void plotMarkers(List<MapEntity> mbList)
    {
        if(mbList.size() > 0)
        {
            for (MapEntity myMarker : mbList2)
            {

                // Create user marker with custom icon and other options
                MarkerOptions markerOption = new MarkerOptions().
                        position(new LatLng(myMarker.getLat(), 
                                myMarker.getLang()));
                markerOption.icon(BitmapDescriptorFactory.
                        fromResource(R.drawable.ic_launcher));

                Marker currentMarker = googleMap.addMarker(markerOption);
                mMarkersHashMap.put(currentMarker, myMarker);

                //googleMap.setInfoWindowAdapter(new MarkerInfoWindowAdapter());
            }
        }
    }
}


public class MapTestAdapter extends BaseAdapter {

    private Activity activity;
    private LayoutInflater inflater;
    private List<MapEntity> mapItems;
    private TextView tvTitle, tvLat, tvLang;

    ImageLoader imageLoader = AppController.getInstance().getImageLoader();

    public MapTestAdapter(Activity activity,
            List<MapEntity> mapItems ) {
        super();
        this.activity = activity;
        this.mapItems = mapItems;

    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return mapItems.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return mapItems.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        if (inflater == null)
            inflater = (LayoutInflater) 
                    activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (convertView == null)
            convertView = inflater.inflate(R.layout.fragment_map_custom_marker, null);
        if (imageLoader == null)
            imageLoader = AppController.getInstance().getImageLoader();

        tvTitle = (TextView) convertView.findViewById(R.id.txtTitleMarker);
        tvLat = (TextView) convertView.findViewById(R.id.txtLatMarker);
        tvLang = (TextView) convertView.findViewById(R.id.txtLangMarker);

        NetworkImageView imageshow = (NetworkImageView) 
                convertView.findViewById(R.id.markerthumnail);

        final MapBerau mb = mapItems.get(position);

        tvTitle.setText(mb.getTitle());
        tvLat.setText(String.valueOf(mb.getLat()));
        tvLang.setText(String.valueOf(mb.getLang()));
        imageshow.setImageUrl(mb.getThumbnail(), imageLoader);

        return convertView;
    }


}

Answer 1

要放置多个标记，请尝试使用以下代码：

private HashMap<Marker, HashMap<String, String>> markerHashMap;
markerHashMap = new HashMap<Marker, HashMap<String, String>>();

//Here, my data format is ArrayList<HashMap<String, String>>;
for (int i = 0; i < YOUR DATA.size(); i++) {
                                final HashMap<String, String> mapData = YOURDATA.get(i);
                                if (mapData.get("latitude").trim().length() > 0 && mapData.get("longitude").trim().length() > 0) {
                                    placeMarker(mapData);
                                }
                            }

//placeMarker() method:

private void placeMarker(final HashMap<String, String> mapData) {
private Marker marker;
        try {
            marker=googleMap.addMarker(new MarkerOptions().icon(
                    BitmapDescriptorFactory.fromBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.YOUR MARKER IMAGE))).position(
                    new LatLng(Double.parseDouble(mapData.get("latitude")), Double.parseDouble(mapData.get("longitude")))));
            markerHashMap.put(marker, mapData);

        } catch (Exception e) {
            e.printStackTrace();
        }

    }