如何加载仅查看部分地图的标记？

Question

在我的代码中，我使用 Google API 从 JSON 数据加载标记。它一次加载所有地图图标，大约需要。 2分钟加载，这是很多时间。有什么方法可以加载屏幕区域中的标记。
1. 如何快速加载标记。
2.图标加载没有停止。 3. 如何制作集群并一次性加载

   @Override
protected List < Product > doInBackground(Void...params) {

   HostnameVerifier hostnameVerifier = org.apache.http.conn.ssl.SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER;

   DefaultHttpClient client = new DefaultHttpClient();

   SchemeRegistry registry = new SchemeRegistry();
   SSLSocketFactory socketFactory = SSLSocketFactory.getSocketFactory();
   socketFactory.setHostnameVerifier((X509HostnameVerifier) hostnameVerifier);
   registry.register(new Scheme("http", socketFactory, 443));
   SingleClientConnManager mgr = new SingleClientConnManager(client.getParams(), registry);
   DefaultHttpClient httpClient = new DefaultHttpClient(mgr, client.getParams());

   // Set verifier
   HttpsURLConnection.setDefaultHostnameVerifier(hostnameVerifier);


   HttpPost httpPost = new HttpPost("https://towncitycards.com/webservice_action.php?action=all_products");

   URLConnection urlConn = null;
   BufferedReader bufferedReader = null;
   try {
       URL url = new URL(this.serverUrl);
       urlConn = url.openConnection();
       bufferedReader = new BufferedReader(new InputStreamReader(urlConn.getInputStream()));

       StringBuffer stringBuffer = new StringBuffer();
       String line;
       while ((line = bufferedReader.readLine()) != null) {
           stringBuffer.append(line);
       }

       JSONObject response = new JSONObject(stringBuffer.toString());

       List < Product > products = new ArrayList < > ();
       HashMap < String, Bitmap > iconsMap = new HashMap < > ();
       try {
           JSONArray productsJSON = response.getJSONArray("all_products");
           for (int ixProduct = 0; ixProduct < productsJSON.length(); ixProduct++) {
               JSONObject productJSON = productsJSON.getJSONObject(ixProduct);
               String mapIconStr = productJSON.getString("map_icon");
               URI uri = new URI(mapIconStr);
               String[] segments = uri.getPath().split("/");
               String iconName = segments[segments.length - 1];

               // percetn-encode URL
               String mapIconPath = mapIconStr.substring(0, mapIconStr.indexOf(iconName));
               String iconUrlString = mapIconPath + URLEncoder.encode(iconName, "UTF-8");

               // replace "http:" with "https:"
               iconUrlString = iconUrlString.replace("http:", "https:");

               Log.d("Icon Load ", "doInBackground: " + iconUrlString);
               Bitmap bmp;
               if (!iconsMap.containsKey(iconUrlString)) {
                   bmp = getBitmapFromURL(iconUrlString);
                   // populate map with unique icons
                   iconsMap.put(iconUrlString, bmp);
               } else {
                   bmp = iconsMap.get(iconUrlString);
               }

               if (bmp != null) {
                   try {
                       Product product = new Product();
                       product.id = productJSON.getString("ID");
                       product.name = productJSON.getString("post_title");
                       product.lat = productJSON.getDouble("latitude");
                       product.lon = productJSON.getDouble("longitude");
                       id = product.id;
                       System.out.println("my Id stored" + id);
                       bmp = Bitmap.createScaledBitmap(bmp, (int)(bmp.getWidth() * 2.5), (int)(bmp.getHeight() * 2.5), true);
                       product.icon = bmp;
                       products.add(product);
                   } catch (Exception ignore) {}

               }

           }

       } catch (JSONException ex) {
           Log.e("App", "Failure", ex);
       }

       return products;
   } catch (Exception ex) {
       Log.e("App", "yourDataTask", ex);
       return null;
   } finally {
       if (bufferedReader != null) {
           try {
               bufferedReader.close();
           } catch (IOException e) {
               e.printStackTrace();
           }
       }
   }


 }

   @Override
    protected void onPostExecute(List < Product > products) {
       if (products != null) {
           for (final Product product: products) {

           Marker marker = googlemap.addMarker(new MarkerOptions()
               .position(new LatLng(product.lat, product.lon))
               .title(product.name)
               .icon(BitmapDescriptorFactory.fromBitmap(product.icon)));
           markerIds.put(marker, product.id);


       }
       if (mDialog != null && mDialog.isShowing()) {
           mDialog.dismiss();
       }
   }

   }
   }

Answer 1

由于您将位图用于标记，您的代码需要很长时间，只是为了证明从执行后删除位图并检查时间。像这样

@Override
protected void onPostExecute(List < Product > products) {
   if (products != null) {
       Log.e("startTime", System.currentTimeMillis());
       for (final Product product: products) {

       Marker marker = googlemap.addMarker(new MarkerOptions()
           .position(new LatLng(product.lat, product.lon))
           .title(product.name)
       markerIds.put(marker, product.id);


   }
   Log.e("endTime", System.currentTimeMillis());
   if (mDialog != null && mDialog.isShowing()) {
       mDialog.dismiss();
   }
}

你试过 git library https://github.com/googlemaps/android-maps-utils 它非常有效地绘制了所有市场，而不会使手机变得缓慢而有效。