android - onTap on map-marker give me NullPointerException -


having problem ontap on markers in google map.

this error

 05-31 21:46:21.420: e/androidruntime(5541): java.lang.nullpointerexception 05-31 21:46:21.420: e/androidruntime(5541):     @ com.android.internal.app.alertcontroller$alertparams.(alertcontroller.java:753) 05-31 21:46:21.420: e/androidruntime(5541):     @ android.app.alertdialog$builder.(alertdialog.java:273) 05-31 21:46:21.420: e/androidruntime(5541):     @ my.class.hellomapview$locationoverlay.ontap(hellomapview.java:1361)

and code error @ my.class.hellomapview$locationoverlay.ontap(hellomapview.java:1361)

    public class locationoverlay extends itemizedoverlay<overlayitem>  {     //public class locationoverlay extends itemizedoverlay{         private arraylist<overlayitem> overlaylist = new arraylist<overlayitem>();         private mapview mapview;         public string pickedlat;         public string pickedlng;         private context mcontext;           public locationoverlay(mapview mapview, drawable defaultmarker, context context) {             //super(null);              super(boundcenterbottom(defaultmarker));              mcontext = context;             this.mapview = mapview; // need ontap             populate();          }          @override         protected overlayitem createitem(int i) {              return overlaylist.get(i);         }          @override         public int size() {              return overlaylist.size();         }          public void addoverlayitem(overlayitem overlayitem) {              if(!overlaylist.contains(overlayitem)){                   overlaylist.add(overlayitem);                   setlastfocusedindex(-1);                   populate();                   }             //  populate();         }          @override          protected boolean ontap(int pindex)          {            overlayitem item = overlaylist.get(pindex);            alertdialog.builder dialog = new alertdialog.builder(mcontext);            dialog.settitle(item.gettitle());            dialog.setmessage(item.getsnippet());            dialog.show();            return true;          }

the line refered in errorlog this

alertdialog.builder dialog = new alertdialog.builder(mcontext);

and can guess googling it, mcontext not passed along... cant right...

please help

check call constructor null value might passed in there. can use this keyword since activity subclass of context so

locationoverlay locationoverlay = new locationoverlay(mapview, getresources().getdrawable(r.drawable.polis), this);

or if calling fragment use getactivity() method

locationoverlay locationoverlay = new locationoverlay(mapview, getresources().getdrawable(r.drawable.polis), this.getactivity());

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