google maps - android GoogleMaps marker scalable icon -


i using googleplaces api populate things around user, works fine now. use icon returned api set each marker. it's (except icon ugly well), problem becomes over-stacked whenever zoom-out (around zoom level 13) tried implement hide marker whenever zoom-out much, or tried find math formula change alpha property of marker smoothly hide more zoom-out solutions not pleasant.

map.setoncamerachangelistener(new googlemap.oncamerachangelistener() {     @override     public void oncamerachange(cameraposition cameraposition) {         float zoomlevel = cameraposition.zoom;         if (zoomlevel < 13) {             (int = 0; < places.size(); i++)                 places.get(i).setvisible(false);         } else {             (int = 0; < places.size(); i++) {                 places.get(i).setvisible(true);             }         }     } });

is there way handle such case ?

i have 1 example : airbnb application (but don't understand perform behind scene).

it seems airbnb hides/shows specific markers when zoom level changes.

you use marker clustering markers join single group when zoomed out. if that's not want, read on.

i answered similar question regarding polylines here.

the solution create sparse array, specific zoom levels, contains specific markers. e.g.:

// zoom level 16 , list<marker> markers = new arraylist<marker>(); markers.add(mmap.addmarker(new markeroptions()         .position(new latlng(48.867068, 2.351503)))); ... // markers hidden default (marker marker : markers) marker.setvisible(false);  mzoommarkers.put(16, markers);

then initialize map, revealing of markers:

sparsearray<list<marker>> mzoommarkers = new sparsearray<list<marker>>(); int mzoomlevel = 16;  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     ...     // zoom 16     mmap.animatecamera(cameraupdatefactory.newlatlngzoom(point, mzoomlevel), 1000, null);     // reveal markers     for(int i=0; i<mzoommarkers.size(); i++) {         // loop until zoom level reached         if  (mzoommarkers.keyat(i) > zoomlevel) break;         showmarkers(mzoommarkers.get(mzoommarkers.keyat(i)));     }     ... }  private void showmarkers(list<marker> markers) {     if (markers != null) {         (marker marker : markers) marker.setvisible(true);     } }  private void hidemarkers(list<marker> markers) {     if (markers != null) {         (marker marker : markers) marker.setvisible(false);     } }

finally set zoom level listener add/remove markers accordingly:

mmap.setoncamerachangelistener(new googlemap.oncamerachangelistener() {     @override     public void oncamerachange(cameraposition cameraposition) {         /* note because casting zoomlevel int,          * considered changed when reaches          * new integer when rounded (e.g. 5.0, 6.0 etc.) */         int newzoomlevel = (int) cameraposition.zoom;         if (newzoomlevel != mzoomlevel) {             log.d(tag, "new zoom level: " + newzoomlevel);             // loop changed zoom levels             // e.g. zoomed-out 15 13, hide [14, 15]             if (newzoomlevel < mzoomlevel) { // zoomed out                 (int i=1; i<=mzoomlevel-newzoomlevel; i++)                     hidemarkers(mzoommarkers.get(newzoomlevel + i));             } else { // zoomed-in                 (int i=1; i<=newzoomlevel-mzoomlevel; i++)                     showmarkers(mzoommarkers.get(mzoomlevel + i));             }             mzoomlevel = newzoomlevel;         }     } });

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