android - How to add loading progress at bottom of recyclerview? -

i have app contain recyclerview ads in between recyclerview , losing progress footer @ bottom of recyclerview when scroll @ bottom of recyclerview adding more data in dataset working fine problem adding loading progress @ bottom.

code of main activity:

 contacts = new arraylist<>();     random = new random();     (int = 0; < 5; i++) {         contact contact = new contact();         contact.setphone(phonenumbergenerating());         contact.setemail("contact" + + "@gmail.com");         contact.setviewtype(1);         contacts.add(contact);     }     //place 2 admob ads in recyclerview     contact mystring1 = new contact();     mystring1.setviewtype(2);     contacts.add(3,mystring1);      recyclerview.setlayoutmanager(new linearlayoutmanager(this));     contactadapter = new contactadapter(recyclerview, contacts, this);     recyclerview.setadapter(contactadapter);      //set load more listener recyclerview adapter     contactadapter.setonloadmorelistener(new onloadmorelistener() {         @override         public void onloadmore() {             if (contacts.size() <= 7) {                 contacts.add(null);                 contactadapter.notifyiteminserted(contacts.size() - 1);                 new handler().postdelayed(new runnable() {                     @override                     public void run() {                         contacts.remove(contacts.size() - 1);                         contactadapter.notifyitemremoved(contacts.size());                          //generating more data                         int index = contacts.size();                         int end = index + 2;                         (int = index; < end; i++) {                             contact contact = new contact();                             contact.setphone(phonenumbergenerating());                             contact.setemail("devexchanges" + + "@gmail.com");                             contact.setviewtype(1);                             contacts.add(contact);                         }                         //place 1 admob ads in recyclerview                         contact mystring1 = new contact();                         mystring1.setviewtype(2);                         contacts.add(3,mystring1);                          contactadapter.notifydatasetchanged();                         contactadapter.setloaded();                     }                 }, 5000);             } else {                 toast.maketext(mainactivity.this, "loading data completed", toast.length_short).show();             }         }     }); 

code of adapter:

public int getitemviewtype(int position) {     if (position == contacts.size()) {         // footer_view check in switch/case         return 3;     }     return contacts.get(position).getviewtype(); }  @override public recyclerview.viewholder oncreateviewholder(viewgroup parent, int viewtype) {     recyclerview.viewholder viewholder = null;     layoutinflater inflater = layoutinflater.from(parent.getcontext());     switch (viewtype) {         case 1:             view itemview = inflater.inflate(r.layout.item_recycler_view_row, parent, false);             viewholder = new userviewholder(itemview);             break;         case 2:             view adview = inflater.inflate(r.layout.item_three, parent, false);             viewholder = new itemthree(adview);             break;         case 3:             view loading = inflater.inflate(r.layout.item_loading, parent, false);             viewholder = new loadingviewholder(loading);             break;     }     return viewholder; }  @override public void onbindviewholder(recyclerview.viewholder holder, int position) {     switch (holder.getitemviewtype()) {         case 1:             contact contact = contacts.get(position);             userviewholder userviewholder = (userviewholder) holder;             userviewholder.phone.settext(contact.getemail());             userviewholder.email.settext(contact.getphone());             break;         case 2:             itemthree itemthree = (itemthree) holder;             itemthree.textview.settext("ads");             break;         case 3:             loadingviewholder loadingviewholder = (loadingviewholder) holder;             loadingviewholder.progressbar.setindeterminate(true);             break;     } }  @override public int getitemcount() {     return contacts.size()+1; } 

one easy way use library https://github.com/mikepenz/fastadapter

and use progress view footeradapter.

but on approach, should add type 3 contact before notifyadapterchange.

if(shouldloadmore){     contact laoder = new contact();     contact.setviewtype(3);     contacts.add(loader); } 

and everytime data comes check last item if type 3. replace

contacts.remove(contacts.size()-1); 

with

if(contacts.size() > 0 && contacts.get(contacts.size()-1).getviewtype() == 3){    contacts.remove(contacts.size()-1); }