java - My Recyclerview list stopped working after implementing SQLite database -

i'm building list app. i'm learning sqlite databases , i'm trying save user input sqlite database table , display in recyclerview list. when did without sqlite, worked problem implementation of database table. app supposed add data list per button click:

addingitems.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view view) {                 if(itemsinput.gettext() != null){                     items.add(new todo(itemsinput.gettext().tostring()));                     itemsinput.settext("");                 }else {                     toast.maketext(mainactivity.this, "please enter do", toast.length_short).show();                 }                 itemadapter.notifydatasetchanged();             }         }); 

but not that. app not crash. problem list shows absolutely no data. following relevant java files:

mainactivity.java

public class mainactivity extends appcompatactivity {      private sqlitedatabase sqlitedatabase;     private list<todo> items = new arraylist<>();     private itemadapter itemadapter;     private recyclerview listitemsrecyclerview;     edittext itemsinput;     button addingitems;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          itemsinput = (edittext)findviewbyid(r.id.to_do_edittext);         addingitems = (button)findviewbyid(r.id.to_do_btn);         listitemsrecyclerview = (recyclerview) findviewbyid(r.id.to_do_list);          todolistdatabasehelper databasehelper = new todolistdatabasehelper(this);         sqlitedatabase = databasehelper.getwritabledatabase();          items = new arraylist<>();         recyclerview.layoutmanager layoutmanager = new linearlayoutmanager(getapplicationcontext());         listitemsrecyclerview.setlayoutmanager(layoutmanager);         listitemsrecyclerview.setitemanimator(new defaultitemanimator());;         itemadapter = new itemadapter(items);         listitemsrecyclerview.setadapter(itemadapter);          new itemtouchhelper(new itemtouchhelper.simplecallback(0,                 itemtouchhelper.left | itemtouchhelper.right) {              @override             public boolean onmove(recyclerview recyclerview, recyclerview.viewholder viewholder, recyclerview.viewholder target) {                 return false;             }              @override             public void onswiped(recyclerview.viewholder viewholder, int direction) {              }         });          addingitems.setonclicklistener(new view.onclicklistener() {             @override             public void onclick(view view) {                 if(itemsinput.gettext().length() > 0){                     addnewtodo(itemsinput.gettext().tostring());                     itemsinput.settext("");                 }else {                     toast.maketext(mainactivity.this, "please enter do", toast.length_short).show();                 }                 itemadapter.notifydatasetchanged();             }         });     }      private list<todo> getalltodos(){         cursor cursor = sqlitedatabase.rawquery("select * " + todocontract.todoentry.table_name, new string[]{});         list<todo> todos = new arraylist<>();         todo todo;         if (cursor != null && cursor.getcount() > 0) {             if (cursor.movetofirst()) {                 {                      string name = cursor.getstring(cursor.getcolumnindex(todocontract.todoentry.column_todo_name));                     int priority = cursor.getint(cursor.getcolumnindex(todocontract.todoentry.column_todo_priority));                     int timestamp = cursor.getint(cursor.getcolumnindex(todocontract.todoentry.column_todo_timestamp));                     todo = new todo(name);                     todos.add(todo);                 } while (cursor.movetonext());             }             cursor.close();         }         return todos;     }      private long addnewtodo(string name){         contentvalues cv = new contentvalues();         cv.put(todocontract.todoentry.column_todo_name, name);         return sqlitedatabase.insert(todocontract.todoentry.table_name, null, cv);     } } 

my custom adapter:

public class itemadapter extends recyclerview.adapter<itemadapter.viewholder> {      private list<todo> todolist;      public class viewholder extends recyclerview.viewholder {         public textview todotextview;          public viewholder(view itemview) {             super(itemview);              todotextview = (textview) itemview.findviewbyid(r.id.to_do);         }     }      public itemadapter(list<todo> todolist) {         this.todolist = todolist;     }      @override     public itemadapter.viewholder oncreateviewholder(viewgroup parent, int viewtype) {         view itemview = layoutinflater.from(parent.getcontext()).inflate(r.layout.list_item, parent, false);         return new viewholder(itemview);     }      @override     public void onbindviewholder(itemadapter.viewholder holder, int position) {         todo todo = todolist.get(position);         holder.todotextview.settext(todo.gettodo());     }       @override     public int getitemcount() {         return todolist.size();     } } 

i ran unit tests on sqlite classes there no issue them.

try this

public void update() {     cursor.requery();     notifydatasetchanged(); }