android - Dynamic replacing of a fragment is not working -

i know there lot of posts cant find solution. i'm trying replace fragments on activity dynamically, have followed lots of tutorials , posts here , got stuck in 1 exception:

" must implement onfragmentinteractionlistener"

i have looked i'm getting tired of this.

more exception occurs in fragmenttransaction.replace(r.id.content_frame,fragment); line, must missed on main activity cant see it.

here of code..

public class loggedactivity extends appcompatactivity     implements navigationview.onnavigationitemselectedlistener { private framelayout fragment;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_logged);      this.settitle(r.string.app_main);      toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);     setsupportactionbar(toolbar);      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.logged, 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.nav_consultas) {         android.support.v4.app.fragmentmanager fragmentmanager = getsupportfragmentmanager();         android.support.v4.app.fragmenttransaction fragmenttransaction = fragmentmanager.begintransaction();          fragment fragment = new consultasfragment();         fragmenttransaction.replace(r.id.content_frame,fragment);         fragmenttransaction.commit();         //setcontentview(r.layout.activity_main);         // handle camera action     } else if (id == r.id.nav_trans) {      } else if (id == r.id.nav_pagos) {      } else if (id == r.id.nav_telefono) {      } else if (id == r.id.nav_creditos) {      } else if (id == r.id.nav_mapa) {      }      drawerlayout drawer = (drawerlayout) findviewbyid(r.id.drawer_layout);     drawer.closedrawer(gravitycompat.start);     return true; } 

}

my container activity xml

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.drawerlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitssystemwindows="true"     tools:opendrawer="start">      <framelayout         android:id="@+id/content_frame"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <include         layout="@layout/app_bar_logged"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <android.support.design.widget.navigationview         android:id="@+id/nav_view"         android:layout_width="wrap_content"         android:layout_height="match_parent"         android:layout_gravity="start"         android:fitssystemwindows="true"         app:headerlayout="@layout/nav_header_logged"         app:menu="@menu/activity_logged_drawer" />  </android.support.v4.widget.drawerlayout> 

and fragment activity

public class consultasfragment extends fragment {     // todo: rename parameter arguments, choose names match     // fragment initialization parameters, e.g. arg_item_number     private static final string arg_param1 = "param1";     private static final string arg_param2 = "param2";      // todo: rename , change types of parameters     private string mparam1;     private string mparam2;      private onfragmentinteractionlistener mlistener;      public consultasfragment() {         // required empty public constructor     }      /**      * use factory method create new instance of      * fragment using provided parameters.      *      * @param param1 parameter 1.      * @param param2 parameter 2.      * @return new instance of fragment consultasfragment.      */     // todo: rename , change types , number of parameters     public static consultasfragment newinstance(string param1, string param2) {         consultasfragment fragment = new consultasfragment();         bundle args = new bundle();         args.putstring(arg_param1, param1);         args.putstring(arg_param2, param2);         fragment.setarguments(args);         return fragment;     }      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         if (getarguments() != null) {             mparam1 = getarguments().getstring(arg_param1);             mparam2 = getarguments().getstring(arg_param2);         }     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         // inflate layout fragment         return inflater.inflate(r.layout.fragment_consultas, container, false);     }      // todo: rename method, update argument , hook method ui event     public void onbuttonpressed(uri uri) {         if (mlistener != null) {             mlistener.onfragmentinteraction(uri);         }     }      @override     public void onattach(context context) {         super.onattach(context);         if (context instanceof onfragmentinteractionlistener) {             mlistener = (onfragmentinteractionlistener) context;         } else {             throw new runtimeexception(context.tostring()                     + " must implement onfragmentinteractionlistener");         }     }      @override     public void ondetach() {         super.ondetach();         mlistener = null;     }      /**      * interface must implemented activities contain      * fragment allow interaction in fragment communicated      * activity , potentially other fragments contained in      * activity.      * <p/>      * see android training lesson <a href=      * "http://developer.android.com/training/basics/fragments/communicating.html"      * >communicating other fragments</a> more information.      */     public interface onfragmentinteractionlistener {         // todo: update argument type , name         void onfragmentinteraction(uri uri);     } } 

xml...

<framelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context="layout.consultasfragment">      <!-- todo: update blank fragment layout -->     <textview         android:layout_width="match_parent"         android:layout_height="match_parent"         android:text="@string/hello_blank_fragment" />  </framelayout> 

most of code generated automatically android studio.

change loggedactivity declaration

public class loggedactivity extends appcompatactivity implements navigationview.onnavigationitemselectedlistener, consultasfragment.onfragmentinteractionlistener 

then override method in loggedactivity:

@override public void onfragmentinteraction(uri uri) {     // whatever activity when fragment calls } 

the point here need provide mechanism fragment interact activity, calling mlistener.onfragmentinteraction(uri) in fragment, can call activity whatever require.