android - column '0' does not exist for ContentProvider SQLite -

i getting error shown below, how fix problem?

 fatal exception: main  java.lang.illegalargumentexception: column '0' not exist  com.example.contentproviderexample.mainactivity.onloadfinished(mainactivity.java:62) 

the stack trace shows error exists on line 62 of onloadfinished method of mainactivity

@override public void onloadfinished(loader<cursor> loader, cursor cursor) {     adapter.swapcursor(cursor); // <-- stacktrace error } 

here code providerexample class extends contentprovider

  public class providerexample extends contentprovider {   public static final string database_name = "notes.db";  public static final int database_version = 1;  public static final string table_name = "notes";  public static final string authority =  "com.example.contentproviderexample.providerexample";  public static final urimatcher surimatcher;  private static final int notes = 1;  private static final int notes_id = 2;  private static hashmap<string, string> notesprojectionmap;   static {     surimatcher = new urimatcher(urimatcher.no_match);     surimatcher.adduri(authority, table_name, notes);     surimatcher.adduri(authority, table_name + "/#", notes_id);  }    public static interface noteitems extends basecolumns {      // notes in content_uri plural actual table name singular version of word     public static final uri content_uri = uri.parse("content://" + authority + "/notes");     public static final string _id = "_id";     public static final string title = "title";     public static final string text = "text";     public static final string content_type = contentresolver.cursor_dir_base_type + "/vnd.example.providerexample";     // static final string single_record = "vnd.android.cursor.item/vnd.example.providerexample";     public static final string content_item_type = contentresolver.cursor_item_base_type + "/vnd.example.providerexample";     // static final string multiple_records = "vnd.android.cursor.dir/vnd.example.providerexample";      public static final string[] projection_all = {_id, title, text};     public static final string sort_order_default = title + " asc";    }    private static class databasehelper extends sqliteopenhelper{   databasehelper(context context){      super(context, database_name, null, database_version);  }   @override  public void oncreate(sqlitedatabase db) {  db.execsql("create table if not exists " + table_name + " (" + noteitems._id + "  integer primary key autoincrement, " +            noteitems.title + " text, " + noteitems.text + " text);");  }   @override  public void onupgrade(sqlitedatabase db, int previousversion, int newversion) {  db.execsql("drop table if exists " + table_name);  oncreate(db);  }   }   private databasehelper dbhelper;   @override  public boolean oncreate() { dbhelper = new databasehelper(getcontext()); return true;  }   @override  public string gettype(uri uri) { switch (surimatcher.match(uri)){     case notes:         return noteitems.content_type;     case notes_id:         return noteitems.content_item_type;     default:         throw new illegalargumentexception("unknown uri" + uri); }  } 

here mainactivity class

   public class mainactivity extends activity implements loadermanager.loadercallbacks<cursor>{  private simplecursoradapter adapter; private loadermanager loadermanager; private cursorloader cursorloader; private listview listview; private int primarykey; private string primarykeystring; private string testtitle; private string testtext; private static final int loader_id = 1;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      primarykey = 0;     testtitle = "test title";     testtext = "test text";      providerexample providerexample = new providerexample();      primarykeystring = string.valueof(primarykey);     getloadermanager().initloader(loader_id, null, this);     adapter = new simplecursoradapter(this, r.layout.row_layout, null,             new string[]{primarykeystring, testtitle, testtext}, new int[]{r.id.textview1, r.id.textview2, r.id.textview3},             adapter.no_selection);     listview = (listview) findviewbyid(r.id.listview1);     listview.setadapter(adapter);      // load database test values     //loaddatabase();  } // end oncreate  @override public loader<cursor> oncreateloader(int id, bundle args) {     string[] projection = {providerexample.noteitems._id, providerexample.noteitems.title, providerexample.noteitems.text };     cursorloader = new cursorloader(this, providerexample.noteitems.content_uri, projection, null, null, null);     return cursorloader; }  @override public void onloadfinished(loader<cursor> loader, cursor cursor) {     adapter.swapcursor(cursor); }  @override public void onloaderreset(loader<cursor> loader) {     adapter.swapcursor(null); }  } 

edit:

added here query method code

  @override public cursor query(uri uri, string[] projection, string selection, string[] selectionargs, string sortorder) {     sqlitequerybuilder qb = new sqlitequerybuilder();     qb.settables(table_name);     qb.setprojectionmap(notesprojectionmap);          switch(surimatcher.match(uri)){          case notes:              break;          case notes_id:              selection = selection + "_id=" + uri.getlastpathsegment();              break;          default:              throw new illegalargumentexception("unknown uri" + uri);              }          sqlitedatabase db = dbhelper.getreadabledatabase();          cursor c = qb.query(db, noteitems.projection_all, selection, selectionargs, null, null, sortorder);          c.setnotificationuri(getcontext().getcontentresolver(), uri);          return c; }