android - How would I convert this activity to a Fragment? -


below main activity navigation drawer. i've realised fragment transaction, cant activity has fragment. possible convert fragment or shall start again..

import android.os.bundle; import android.support.design.widget.floatingactionbutton; import android.support.design.widget.navigationview; import android.support.design.widget.snackbar; import android.support.v4.app.fragment; import android.support.v4.app.fragmenttransaction; 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; import android.view.view;  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);     }      public boolean onnavigationitemselected(menuitem item) {         // handle navigation view item clicks here.         fragment fragment = null;         int id = item.getitemid();         string get_title = item.gettitle().tostring();          if (id == r.id.my_account) {              fragment = new my_account_fragment();          } else if (id == r.id.nav_media) {             fragment = new media_photo_fragment();          }           if (fragment != null) {             fragmenttransaction ft = getsupportfragmentmanager().begintransaction();             ft.replace(r.id.mainactivity, fragment);             ft.commit();         }          drawerlayout drawer = (drawerlayout) findviewbyid(r.id.drawer_layout);         drawer.closedrawer(gravitycompat.start);         return true;     }   }


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