How to load markers dynamically for current position in Android google-maps?

Question

I\'m currently developing an app for Android which uses google map service. Because users will be able to see thousands of markers I would like to load only those which are curr

Answer 1

I'm doing something similar to yourself but I'm using a server. The reason I'm doing so is for computational reasons. When the application first starts a HTTP request is sent to a php script which contains a MySQL query. The php script recieves the users current lat / long and gives back in a JSON all points within 1KM of the current location. The application then parses that JSON into a local MySQL database and does stuff with it.

To send the HTTP request and parse the JSON into a database I'm doing the following..

  //http post
 try{
         HttpClient httpclient = new DefaultHttpClient();
         HttpPost httppost = new HttpPost("http://URL");
         httppost.setEntity(new UrlEncodedFormEntity(parameters));
         HttpResponse response = httpclient.execute(httppost);
         HttpEntity entity = response.getEntity();
         InputStream is = entity.getContent();

 //convert response to string

        BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
         StringBuilder sb = new StringBuilder();
         String line = null;
         while ((line = reader.readLine()) != null) {
                 sb.append(line + "\n");
         }
         is.close();

         result=sb.toString();
 }catch(Exception e){
     new AlertDialog.Builder(this)
      .setTitle("Woops!")
      .setMessage("Getlocations:It appears the server is not reachable. Check your connectivity and try again.")
      .setPositiveButton("Ok", new DialogInterface.OnClickListener() {

        public void onClick(DialogInterface dialog,
                int which) {
            //User wants to start activity..

        }
       })
       .show();
         Log.e("log_tag", "Error in connection or convert "+e.toString());
 }

 //parse json data
 try{
     System.out.println("parsing data");
         JSONArray jArray = new JSONArray(result);
         if(icount != 0){
             try{
                 SQLiteDatabase db = tweets.getWritableDatabase();
                 db.delete(TABLE_NAME,null,null);
             }finally {
                 tweets.close();
             }
         }
         //TODO: Change this to num
         for(int i=0;i

For this to work all you need is a short php file which takes the Lat / lng Something like...

That'll take in the values and print results in JSON.

//edit: To get the lat / lng in the first place I'm using the GPS.

Hope this helps.