java - How to update image in listview for android -

i want change image in imageview in listview not working.

bellow data , list adapter.

public class archivedata {     public string mto = ""; public imageview mimage; public int mid = 0; public string mtext = ""; public string mdate;  }    public class archivelistadapter extends baseadapter{     private layoutinflater minflater; private vector<archivedata> marchivevector;   public archivelistadapter(context context, final vector<archivedata> data) {     marchivevector = data;     minflater = layoutinflater.from(context); }  public int getcount() {     return marchivevector.size(); }  public object getitem(int position) {     return marchivevector.elementat(position); }  public long getitemid(int position) {     return position; }  public view getview(int position, view convertview, viewgroup parent) {     viewholder holder;             if (convertview == null) {         convertview = minflater.inflate(r.layout.archive, null);                 holder = new viewholder();         holder.mtxtarchivedate = (textview) convertview.findviewbyid(r.id.date);         holder.mtxtarchivetext = (textview) convertview.findviewbyid(r.id.txtarchivetext);             holder.mimage = (imageview) convertview.findviewbyid(r.id.list_image);         holder.mtxtarchiveto = (textview) convertview.findviewbyid(r.id.toname);         convertview.settag(holder);     } else {         holder = (viewholder) convertview.gettag();     }      archivedata data = marchivevector.elementat(position);      holder.mtxtarchivedate.settext(data.mdate);     holder.mtxtarchivetext.settext(data.mtext);              holder.mimage.setimageresource(r.drawable.anonymous_logo);     holder.mtxtarchiveto.settext(data.mto);         return convertview; }      private class viewholder {      textview mtxtarchiveto;      imageview mimage;      textview mtxtarchivetext;      textview mtxtarchivedate; } 

}

here code in activity updating image:

private archives marchive; private archivelistadapter marchivelistadapter;  (int = 0; < marchive.marchive.size(); ++i) {     bitmap im = getfacebookphoto(marchive.marchive.elementat(i).mto);        marchive.marchive.elementat(i).mimage.setimagebitmap(im); } marchivelistadapter = new archivelistadapter(getactivity(),marchive.marchive); marchivelistadapter.notifydatasetchanged(); mscrollview.setadapter(marchivelistadapter); 

it returning error on following row:

marchive.marchive.elementat(i).mimage.setimagebitmap(im); 

can me please ?

thank you

i think order wrong:

init:

marchivelistadapter = new archivelistadapter(getactivity(),marchive.marchive); mscrollview.setadapter(marchivelistadapter); 

update:

for (int = 0; < marchive.marchive.size(); ++i) {     bitmap im = getfacebookphoto(marchive.marchive.elementat(i).mto);        marchive.marchive.elementat(i).mimage.setimagebitmap(im); } if(marchivelistadapter!=null){     marchivelistadapter.notifydatasetchanged(); } else {     //fallback      marchivelistadapter = new archivelistadapter(getactivity(),marchive.marchive);      mscrollview.setadapter(marchivelistadapter); } 

might have given suggestions.