android - how to resolve fatal exception 6 when multiple video playing at a time in videoview -

this code.

public class mainactivity extends activity {     listview listview;     customlistadapter adapter;     private static progressdialog progressdialog;     public static int currentitem;     public static arraylist<string> videolist;     public static mediacontroller mediacontroller ;     boolean pauseonscroll = true;     boolean pauseonfling = true;     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_view);         videolist = new arraylist<string>();          mediacontroller = new mediacontroller(mainactivity.this);          videolist.add("http://journey.coderspreview.com/uploads/home_video/mov_bbb.mp4");         videolist.add("http://journey.coderspreview.com/uploads/experience/165/video/father-and-young-daughter.mp4");         videolist.add("http://journey.coderspreview.com/uploads/experience/185/video/couple-on-sail-boat.mp4");         videolist.add("http://journey.coderspreview.com/uploads/experience/39/video/vid-20141231-wa0006.mp4");         videolist.add("http://journey.coderspreview.com/uploads/experience/26/video/vid-20141216-wa0004.mp4");         listview = (listview) findviewbyid(r.id.list);         listview.setadapter(new customlistadapter(this, videolist));        listview.setonscrolllistener(new abslistview.onscrolllistener() {           private int mfirstvisiblerow = -1;           private int mactiveitem = -1;            @override           public void onscrollstatechanged(abslistview view, int scrollstate) {           }            @override           public void onscroll(abslistview view, int firstvisibleitem,                                int visibleitemcount, int totalitemcount) {               int firstvisiblerow = listview.getfirstvisibleposition();               if( mfirstvisiblerow != firstvisiblerow )               {                   mfirstvisiblerow = firstvisiblerow;                    // cancel video of previous active item                   videoview prevactivevideoview = getvideoviewforrow(mactiveitem);                   if( prevactivevideoview != null )                   {                       prevactivevideoview.pause();                   }                    // start video of new active item                   mactiveitem = mfirstvisiblerow + 1;                   videoview newactivevideoview = getvideoviewforrow(mactiveitem);                   if(newactivevideoview != null)                   {                       newactivevideoview.start();                   }               }           }            private videoview getvideoviewforrow(int row)           {               int firstvisiblerow = listview.getfirstvisibleposition();               view rowview = listview.getchildat(row-firstvisiblerow);               return (rowview == null) ? null : (videoview)rowview.findviewbyid(r.id.videoview);           }        });      }     static class viewholderitem {                  textview textviewitem;                 videoview video;                 progressbar progressbar;             }      public class customlistadapter extends baseadapter {         private activity activity;         private layoutinflater inflater;         private arraylist<string> videolist;          public customlistadapter(activity activity, arraylist<string> videolist) {             this.activity = activity;             this.videolist = videolist;         }          @override         public int getcount() {             return videolist.size();         }          @override         public object getitem(int location) {             return videolist.get(location);         }          @override         public long getitemid(int position) {             return position;         }          @suppresslint("newapi")         @override         public view getview(int position, view convertview, viewgroup parent) {                final viewholderitem viewholder;                if (convertview == null){                   inflater = (layoutinflater) activity.getsystemservice(context.layout_inflater_service);                   convertview = inflater.inflate(r.layout.video_list_item, null);                     viewholder = new viewholderitem();                    viewholder.video = (videoview)convertview.findviewbyid(r.id.videoview);                    viewholder.progressbar = (progressbar)convertview.findviewbyid(r.id.progress);                     viewholder.textviewitem =(textview)convertview.findviewbyid(r.id.txvposition);                      int pos;                    pos=viewholder.video.getcurrentposition();                    log.d("current item position:",""+pos);                     convertview.settag(viewholder);               }else{                 viewholder = (viewholderitem) convertview.gettag();               }               viewholder.textviewitem.settext("video"+position); //             mediacontroller.setanchorview(viewholder.video);              log.d("video url inadapter:", ""+videolist.tostring());              uri uri = uri.parse(videolist.get(position));             // viewholder.video.setmediacontroller(mediacontroller);              viewholder.video.setvideouri(uri);              //viewholder.video.start();              viewholder.video.setonpreparedlistener(new onpreparedlistener() {                      public void onprepared(mediaplayer arg0) {                            viewholder.progressbar.setvisibility(view.gone);                            viewholder.video.start();                      }                    });              viewholder.video.setoninfolistener(new oninfolistener() {                       @override                        public boolean oninfo(mediaplayer mp, int what, int extra) {                          // todo auto-generated method stub                          log.d("buffrring start", "on_info");                          if (mediaplayer.media_info_buffering_start == what) {                                viewholder.progressbar.setvisibility(view.visible);                              log.d("buffrring start", "" + what);                          }                          if (mediaplayer.media_info_buffering_end == what) {                                viewholder.progressbar.setvisibility(view.gone);                                log.d("buffrring end", "" + what);                          }                          if (mediaplayer.media_info_video_rendering_start == what) {                                viewholder.progressbar.setvisibility(view.gone);                                log.d("rendering end", "" + what);                          }                          return false;                        }                    });               viewholder.video.setonerrorlistener(new onerrorlistener() {                         @override                        public boolean onerror(mediaplayer mp, int what, int extra) {                            // todo auto-generated method stub                             log.d("error", "------>error" + + "/" + extra);                            if (extra != 0) {                                toast.maketext(mainactivity.this, "can't play video",                                        toast.length_short).show();                            }                             return false;                        }                    });               return convertview;                    }     } } 

i running multiple video @ time in listview after sometime video hang totally , app crashes giving fatal signal 6 error think memory isuue not sure how resolve issue?