android - Delete item from gridview -

i know here many answers how delete items, can't make work. show errors. can look? added in adapter remove(position), think works wrongly. want after using onitemlongclicklistener delete file , thumbnail too.

main:

protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      final gridview grid = (gridview) findviewbyid(r.id.gridview);     final thumbnailadapter thumbnails = new thumbnailadapter(this);     grid.setadapter(thumbnails);     grid.setonitemlongclicklistener(new adapterview.onitemlongclicklistener(){         @override         public boolean onitemlongclick(adapterview<?> parent, view v, int position,                     long id) {                  final string imgpath = thumbnails.getimagepath(position);                 file file = new file(imgpath);                                    file.delete();                  thumbnails.remove(position);                  thumbnails.notifydatasetchanged();                  grid.invalidateviews();                  grid.setadapter(thumbnails);                 return true;               }     }); 

adapter:

public class thumbnailadapter extends baseadapter {  // context required performing queries private final context mcontext;  // cursor thumbnails private final cursor cursor; private final int imgid; private final int imgdata; private final int count;  public thumbnailadapter(context c) {     this.mcontext = c;      // list of images, sorted last taken first     final string[] projection = {             mediastore.images.media._id,             mediastore.images.media.data     };     cursor = mcontext.getcontentresolver().query(             mediastore.images.media.external_content_uri,             projection,             null,             null,             mediastore.images.media.date_taken + " desc"     );     imgid = cursor.getcolumnindexorthrow(mediastore.images.media._id);     imgdata = cursor.getcolumnindexorthrow(mediastore.images.media.data);     count = cursor.getcount();     log.d("thumbnailadapter", count + " images found"); } @override public int getcount() {     return count; } @override public object getitem(int position) {     return position; } @override public long getitemid(int position) {     return position; } @override public view getview(int position, view convertview, viewgroup parent) {     imageview imageview;     if (convertview == null) {  // if it's not recycled, initialize attributes         imageview = new imageview(mcontext);     } else {         imageview = (imageview) convertview;     }     cursor.movetoposition(position);     final bitmap thumbnail = mediastore.images.thumbnails.getthumbnail(             mcontext.getcontentresolver(),             cursor.getint(imgid),              mediastore.images.thumbnails.micro_kind,             null     );     imageview.setimagebitmap(thumbnail);     log.d("thumbnailadapter", "render: " + cursor.getstring(imgdata));     return imageview;  }  public string getimagepath(int position) {     cursor.movetoposition(position);     return cursor.getstring(imgdata); } public void remove(int position) {     remove(position);     notifydatasetchanged();  } 

}

i guess stack overflow. remove method in adapter recursive forever. instead of deleting file youself ask content resolver remove it. , reload data. dont have call grid.setadapter(thumbnails) again in click listner