从 latlng 的数组列表中添加标记

Question

public class Viewmap extends FragmentActivity implements LocationListener,OnMarkerClickListener {

    // Progress Dialog
        private ProgressDialog pDialog;

        // Creating JSON Parser object
        JSONParser jParser = new JSONParser();




        ArrayList<LatLng> Points;
        // url to get all products list
        private static String url_all_products = "http://192.168.254.107/android_connect/get_all_products.php";

        // JSON Node names
        private static final String TAG_SUCCESS = "success";
        private static final String TAG_PRODUCTS = "products";
        private static final String TAG_LAT = "lat";
        private static final String TAG_LNG = "lng";
    GoogleMap googleMap;


    // products JSONArray
    JSONArray products = null;


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

     // Hashmap for ListView

            Points = new ArrayList<LatLng>();




        int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());
        // Getting Google Play availability status

        // Showing status
        if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available

            int requestCode = 10;
            Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
            dialog.show();

        }else { // Google Play Services are available

             // Getting reference to the SupportMapFragment of activity_main.xml
            SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);

            // Getting GoogleMap object from the fragment
            googleMap = fm.getMap();
            googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
            // Enabling MyLocation Layer of Google Map
            googleMap.setMyLocationEnabled(true);
            googleMap.animateCamera(CameraUpdateFactory.zoomTo(15), 2000, null);

            new LoadAllProducts().execute();





         // Loading products in Background Thread


        }
    }







    private void DrawMarker(LatLng point){
        String add = "";
        // Creating an instance of MarkerOptions
        MarkerOptions markerOptions = new MarkerOptions();

        // Setting latitude and longitude for the marker
        markerOptions.position(point);

        Geocoder geocoder = new Geocoder(Viewmap.this,
                Locale.getDefault());
        try {
            List<Address> addresses = geocoder.getFromLocation(point.latitude,
                    point.longitude, 1);
            add = addresses.get(0).getAddressLine(0) + "," + addresses.get(0).getAddressLine(1) + "," + 
                    addresses.get(0).getAddressLine(2)+","+addresses.get(0).getAddressLine(3);

            }

        catch (IOException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

            // Adding marker on the Google Map
            googleMap.addMarker(markerOptions
                    .title("Click here to do desired action")
                    .snippet(add));


    }

    /**
     * Background Async Task to Load all product by making HTTP Request
     * */
    class LoadAllProducts extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(Viewmap.this);
            pDialog.setMessage("Loading products. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();


        }

        /**
         * getting All products from url
         * */
        protected String doInBackground(String... args) {
            // Building Parameters
                        List<NameValuePair> params = new ArrayList<NameValuePair>();
                        // getting JSON string from URL
                        JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);

                        // Check your log cat for JSON reponse
                        Log.d("All Products: ", json.toString());

                        try {
                            // Checking for SUCCESS TAG
                            int success = json.getInt(TAG_SUCCESS);

                            if (success == 1) {
                                // products found
                                // Getting Array of Products
                                products = json.getJSONArray(TAG_PRODUCTS);

                                // looping through All Products
                                for (int i = 0; i < products.length(); i++) {
                                    JSONObject c = products.getJSONObject(i);

                                    // Storing each json item in variable
                                    String LAT = c.getString(TAG_LAT);
                                    String LNG = c.getString(TAG_LNG);

                                    double lat = Double.valueOf(LAT);
                                    double lng = Double.valueOf(LNG);              


                                    LatLng position = new LatLng(lat, lng);



                                    // adding HashList to ArrayList
                                    Points.add(position);
                                }
                            } else {
                                // no products found
                                // Launch Add New product Activity
                                Intent i = new Intent(getApplicationContext(),
                                        NewProductActivity.class);
                                // Closing all previous activities
                                i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                startActivity(i);
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                        return null;
                    }

                    /**
                     * After completing background task Dismiss the progress dialog
                     * **/
                    protected void onPostExecute(String file_url) {
                        // dismiss the dialog after getting all products
                        pDialog.dismiss();
                        PolylineOptions opt = new PolylineOptions()
                        .addAll(Points)
                        .color(Color.RED);

                    // Add the new line. Keep track of the added polylines
                    // in a list.
                    Polyline p = googleMap.addPolyline(opt);



                    }

                }






    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }




    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onLocationChanged(Location location) {
         // Setting the zoom level in the map on last position  is clicked


    }

    @Override
    public boolean onMarkerClick(Marker marker) {




        return false;
    }
}

将数据库中的所有纬度和经度放入 LatLng 点数组列表后，我想将存储在 LatLng 数组列表中的所有标记绘制到 OnPostExecute，但我似乎找不到任何答案。

Answer 1

我无法回答您的问题，但如果您只是想在地图上绘制那些 LatLng，则遍历 LatLng 命名点的 ArrayList 并为每个 LatLng 调用方法 DrawMarker。