android - custom SimpleCursorAdapter and BindView (buttons are randomly Invisible) -

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i made custom simplecursoradapter can click on button inside listview (the button needs call someone) when there no phone number want button invisible, @ first code show correctly when scroll , down few times buttons randomly become invisible.

edited: when of them visible it's fine when 1 (button inside item on listview) become invisible starts randomly become invisible.

my code:

 public mycursoradapter(context context, int layout, cursor c, string[] from, int[] to, double lat, double lon) {     super(context, layout, c, from, to);     latc = lat;     lonc = lon; }  public mycursoradapter(context context, int layout, cursor c, string[] from, int[] to) {     super(context, layout, c, from, to); }  @override public view newview(context context, cursor cursor, viewgroup parent) {         layoutinflater inflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service);         view view = inflater.inflate(r.layout.list_view_place_list, parent, false);         return view; }  @override public void bindview(final view view,final context context,final cursor cursor) {     sharedpreferences settings = preferencemanager.getdefaultsharedpreferences(context);      string name = cursor.getstring(cursor.getcolumnindex(placesdb.place_name));     string address = cursor.getstring(cursor.getcolumnindex(placesdb.place_address));     double lat = cursor.getdouble(cursor.getcolumnindex(placesdb.place_lat));     double lon = cursor.getdouble(cursor.getcolumnindex(placesdb.place_lon));     final string phone = cursor.getstring(cursor.getcolumnindex(placesdb.place_phone));      textview txtname = (textview) view.findviewbyid(r.id.txtname);     textview txtaddress = (textview) view.findviewbyid(r.id.txtaddress);     textview txtdistance = (textview) view.findviewbyid(r.id.txtdistance);      txtname.settext(name);     txtaddress.settext(address);      button btncall = (button) view.findviewbyid(r.id.btncall);     if (latc != -1) {         double dis = getdistancefromlatloninkm(latc, lonc, lat, lon);         if (settings.getstring("mk", "km").equals("miles")) {             dis = dis / 1.621371;             txtdistance.settext(string.format("%.3f", dis) + " miles");         }         else             txtdistance.settext(string.format("%.3f", dis) + " km");     } else {         txtdistance.settext("distance not available");     }     if (phone == null){         btncall.setvisibility(view.invisible);     }     else {         view.findviewbyid(r.id.btncall).setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view v) {                 string tel;                 intent dialintent = new intent();                 tel = phone.replace("-", "");                 dialintent.setaction(intent.action_call);                 dialintent.setdata(uri.parse("tel:" + tel));                 context.startactivity(dialintent);             }         });     } }

since android tries recycle unused listview-items have set gui elements

if (phone == null){     btncall.setvisibility(view.invisible); }

only made btncall invisible there no code make recycled invisible listview-item-btncall visible again.

if (phone == null){     btncall.setvisibility(view.invisible); } else {     btncall.setvisibility(view.visible); }

should job.

for same reason code view.findviewbyid(r.id.btncall).setonclicklistener(...) should execeted in newview() added once.


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