listview - View List - Android Studio = Navigation Drawer Layout -

i beginner in android studio , need help. i'm trying make app on navigation drawer layout. so, found tutorial how specific layout when click on in navigation drawer menu

https://www.youtube.com/watch?v=ju837bqobfg&list=plqic834sj9lcamgq8jhpsrqpd9nfnjg0q

works perfect!

just want make viewlist in 1 layout of them i'm refering main navigation menu found next tutorial (http://www.viralandroid.com/2016/04/start-new-activity-from-android-listview-onitem-clicked.html).

i tried apply listview tutorial on brand-new project , works perfectly! problem when want apply project have used navigation on specific layouts fragments. says there duplication.

here mainactivity:

package com.example.martin.ultimateenglish;    import android.os.bundle;  import android.support.design.widget.floatingactionbutton;  import android.support.design.widget.snackbar;  import android.view.view;  import android.support.design.widget.navigationview;  import android.support.v4.view.gravitycompat;  import android.support.v4.widget.drawerlayout;  import android.support.v7.app.actionbardrawertoggle;  import android.support.v7.app.appcompatactivity;  import android.support.v7.widget.toolbar;  import android.view.menu;  import android.view.menuitem;    public class mainactivity extends appcompatactivity          implements navigationview.onnavigationitemselectedlistener {        @override      protected void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);          setcontentview(r.layout.activity_main);          toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);          setsupportactionbar(toolbar);            floatingactionbutton fab = (floatingactionbutton) findviewbyid(r.id.fab);          fab.setonclicklistener(new view.onclicklistener() {              @override              public void onclick(view view) {                  snackbar.make(view, "replace own action", snackbar.length_long)                          .setaction("action", null).show();              }          });            drawerlayout drawer = (drawerlayout) findviewbyid(r.id.drawer_layout);          actionbardrawertoggle toggle = new actionbardrawertoggle(                  this, drawer, toolbar, r.string.navigation_drawer_open, r.string.navigation_drawer_close);          drawer.setdrawerlistener(toggle);          toggle.syncstate();            navigationview navigationview = (navigationview) findviewbyid(r.id.nav_view);          navigationview.setnavigationitemselectedlistener(this);      }        @override      public void onbackpressed() {          drawerlayout drawer = (drawerlayout) findviewbyid(r.id.drawer_layout);          if (drawer.isdraweropen(gravitycompat.start)) {              drawer.closedrawer(gravitycompat.start);          } else {              super.onbackpressed();          }      }        @override      public boolean oncreateoptionsmenu(menu menu) {          // inflate menu; adds items action bar if present.          getmenuinflater().inflate(r.menu.main, menu);          return true;      }        @override      public boolean onoptionsitemselected(menuitem item) {          // handle action bar item clicks here. action bar          // automatically handle clicks on home/up button, long          // specify parent activity in androidmanifest.xml.          int id = item.getitemid();            //noinspection simplifiableifstatement          if (id == r.id.action_settings) {              return true;          }            return super.onoptionsitemselected(item);      }        @suppresswarnings("statementwithemptybody")      @override      public boolean onnavigationitemselected(menuitem item) {          // handle navigation view item clicks here.          int id = item.getitemid();            if (id == r.id.list) {              getfragmentmanager().begintransaction()                      .replace(r.id.content_frame                              , new first_layout())                      .commit();            } else if (id == r.id.nav_changelog) {              getfragmentmanager().begintransaction()                      .replace(r.id.content_frame                              , new changelog())                      .commit();            }            drawerlayout drawer = (drawerlayout) findviewbyid(r.id.drawer_layout);          drawer.closedrawer(gravitycompat.start);          return true;      }  }

could me? seems can't use name of class more once make 2 tutorials unbelieveable hard me now! want have navigation drawer layout menu items refering specific layouts want apply viewlist.

thank every advice or answer.

martin u.