android - Move marker in Google map when latitude longitude changes -
in application creating array list containing latitude , longitude json , adding marker in map buy suing array list when lat long changes marker moves 1 position create 2 marker instead of moving,if give map.clear(),the whole marker getting disable , enabling want remove old marker how possible without using map.clear(),please help
private void setupmapifneeded(view inflatedview) {
if (mmap == null) { mmap = ((mapview) inflatedview.findviewbyid(r.id.mapview)).getmap(); mmap.setmylocationenabled(true); location mylocation = mmap.getmylocation(); if (mmap != null) { //mmap.clear(); // setupmap(); mmap.setonmylocationchangelistener(new googlemap.onmylocationchangelistener() { @override public void onmylocationchange(location arg0) { // todo auto-generated method stub final latlngbounds.builder builder = new latlngbounds.builder(); mmap.clear(); if (marker != null) { marker.remove(); } (int = 0; < arraylist1.size(); i++) { final latlng position = new latlng(double .parsedouble(arraylist1.get(i).get("latitude")), double.parsedouble(arraylist1.get(i).get( "longitude"))); string ime1 = arraylist1.get(i).get("ime"); final markeroptions options = new markeroptions() .position(position); //mmap.addmarker(options); //mmap.addmarker(options.icon(bitmapdescriptorfactory .fromresource(r.drawable.buspng)).title(ime1)); marker=mmap.addmarker(new markeroptions().position(position).icon(bitmapdescriptorfactory .fromresource(r.drawable.buspng)).title(ime1)); //options.title(ime1); builder.include(position); } latlng latlng = new latlng(arg0.getlatitude(), arg0 .getlongitude()); mmap.setmaptype(googlemap.map_type_normal); mmap.setmylocationenabled(true); mmap.movecamera(cameraupdatefactory.newlatlng(latlng)); // mmap.setonmapclicklistener(null); mmap.setonmarkerclicklistener(null); mmap.animatecamera(cameraupdatefactory.zoomto(9)); } }); } } } /* protected void retrieveandaddcities() throws ioexception { httpurlconnection conn = null; final stringbuilder json = new stringbuilder(); try { url url = new url(service_url); conn = (httpurlconnection) url.openconnection(); inputstreamreader in = new inputstreamreader(conn.getinputstream()); int read; char[] buff = new char[1024]; while ((read = in.read(buff)) != -1) { json.append(buff, 0, read); } } catch (ioexception e) { log.e(log_tag, "error connecting service", e); throw new ioexception("error connecting service", e); } { if (conn != null) { conn.disconnect(); } } new downloadjson().execute(); } */ private class downloadjson extends asynctask<void, void, void> { string result=""; @override protected void onpreexecute() { super.onpreexecute(); } @override protected void doinbackground(void... params) { try { arraylist1 = new arraylist<hashmap<string, string>>(); jsonparser jparser = new jsonparser(); string result = ""; json = jparser.getjsonfromurl(service_url); try { //arraylist1.clear(); jsonarray = json.getjsonarray("singleimes"); log.d("haaaaaaaaaaaa", "" + json); (int = 0; < jsonarray.length(); i++) { log.d("h11111111111111111111111111", "" + jsonarray.length()); map = new hashmap<string, string>(); json = jsonarray.getjsonobject(i); // pubname = json.getstring("pubname"); latitude = json.getdouble("latitude"); longitude = json.getdouble("longitude"); ime = json.getstring("ime"); // map.put("pubname", json.getstring("pubname")); //map.put("pubid", json.getstring("pubid")); map.put("latitude", json.getstring("latitude")); log.e("checklat",""+json.getstring("latitude") ); map.put("longitude", json.getstring("longitude")); log.e("checklong",""+json.getstring("longitude") ); map.put("ime", json.getstring("ime")); arraylist1.add(map); } } catch (jsonexception e) { log.e("log_tag", "error parsing data " + e.tostring()); result="error"; e.printstacktrace(); } }catch(exception e){ result="error"; } return null; } protected void onpostexecute(void args) { // mprogressdialog.dismiss(); } } @override public void onresume() { super.onresume(); mmapview.onresume(); } @override public void onpause() { super.onpause(); mmapview.onpause(); } @override public void ondestroy() { mmapview.ondestroy(); super.ondestroy(); } @override public void onlocationchanged(location location) { // todo auto-generated method stub /* toast.maketext(getactivity(), "onlocationupdated!!!", toast.length_short).show(); log.d("onlocationupdated!!!",""); new downloadjson().execute(); setupmapifneeded(rootview);*/ } @override public void onstatuschanged(string provider, int status, bundle extras) { // todo auto-generated method stub } @override public void onproviderenabled(string provider) { // todo auto-generated method stub } @override public void onproviderdisabled(string provider) { // todo auto-generated method stub } }
first of need identify markers somehow, every marker has have uniq id, lets it's string.
then need store markers.
private hashmap<string, marker> mmarkers = new hashmap<>(); then before update markers new data need make copy of previous markers collection find out 1 newly added , 1 missing:
hashmap<string, marker> oldmarkers = mmarkers; mmarkers = new hashmap<>(); (yourmarkerobject m : newmarkers) { // assume have collections of objects here string id = m.getid(); // id marker marker = oldmarkers.get(id); if (marker == null) { // means it's new 1 // create marker , attach map on right position } else { // means have marker attached, move marker.setposition(m.getposition()); oldmarkers.remove(id); // remove 1 old markers collection } mmarkers.put(id, marker); } (marker oldmarker : oldmarkers.values()) { // detach old markers }
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