android - Saving Map Marker Reference -

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i wondering if me, trying save reference newly created marker in concurrenthashmap, seem have no problem storing reference when try retrieve app crashes , throws nullpointer exception, below how store , retrieve marker.

storing in mmarkers private map<latlng, marker> mmarkers = new concurrenthashmap<latlng, marker>();

latlng currpos = new latlng(map.getcameraposition().target.latitude,map.getcameraposition().target.longitude);         marker marker = map.addmarker(new markeroptions()         .position(currpos)         );         mmarkers.put(currpos, marker);          locationcount++;        sharedpreferences.editor editor = settings.edit();                   editor.putstring("mlat"+ integer.tostring((locationcount-1)), double.tostring(marker.getposition().latitude));        editor.putstring("mlng"+ integer.tostring((locationcount-1)), double.tostring(marker.getposition().longitude));       editor.putint("locationcount", locationcount);                      editor.putstring("mzoom", float.tostring(map.getcameraposition().zoom));        editor.commit();

removing fails 

map.setonmaplongclicklistener(new onmaplongclicklistener() {          @override         public void onmaplongclick(latlng point) {              marker marker = mmarkers.get(point);              marker.remove(); //fails here             mmarkers.remove(point);                      }     });

i using markers latlng position key store it. 

04-06 16:52:05.535: e/androidruntime(26601): fatal exception: main 04-06 16:52:05.535: e/androidruntime(26601): java.lang.nullpointerexception 04-06 16:52:05.535: e/androidruntime(26601):    @ com.grim.pipboid.fragmentmap$1.onmaplongclick(fragmentmap.java:154) 04-06 16:52:05.535: e/androidruntime(26601):    @ com.google.android.gms.maps.googlemap$7.onmaplongclick(unknown source) 04-06 16:52:05.535: e/androidruntime(26601):    @ com.google.android.gms.maps.internal.j$a.ontransact(unknown source) 04-06 16:52:05.535: e/androidruntime(26601):    @ android.os.binder.transact(binder.java:310) 04-06 16:52:05.535: e/androidruntime(26601):    @ euq.a(sourcefile:93) 04-06 16:52:05.535: e/androidruntime(26601):    @ maps.c.j.b(unknown source) 04-06 16:52:05.535: e/androidruntime(26601):    @ maps.ay.an.c(unknown source) 04-06 16:52:05.535: e/androidruntime(26601):    @ maps.ay.bc.onlongpress(unknown source) 04-06 16:52:05.535: e/androidruntime(26601):    @ maps.bo.g.onlongpress(unknown source) 04-06 16:52:05.535: e/androidruntime(26601):    @ maps.bo.h.c(unknown source) 04-06 16:52:05.535: e/androidruntime(26601):    @ maps.bo.i.handlemessage(unknown source) 04-06 16:52:05.535: e/androidruntime(26601):    @ android.os.handler.dispatchmessage(handler.java:99) 04-06 16:52:05.535: e/androidruntime(26601):    @ android.os.looper.loop(looper.java:137) 04-06 16:52:05.535: e/androidruntime(26601):    @ android.app.activitythread.main(activitythread.java:5227) 04-06 16:52:05.535: e/androidruntime(26601):    @ java.lang.reflect.method.invokenative(native method) 04-06 16:52:05.535: e/androidruntime(26601):    @ java.lang.reflect.method.invoke(method.java:511) 04-06 16:52:05.535: e/androidruntime(26601):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:795) 04-06 16:52:05.535: e/androidruntime(26601):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:562) 04-06 16:52:05.535: e/androidruntime(26601):    @ dalvik.system.nativestart.main(native method)

thank reading

the user can long-click anywhere on map. not have @ precise latitude , longitude of existing marker. hence, latlng not exist in hashmap.


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