@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {

switch (menuItem.getItemId()){
case (R.id.nav_main):

getSupportFragmentManager()

.beginTransaction()
.replace(R.id.content_frame,MainFragment.newInstance())
.commit();

break;


case (R.id.nav_developmens):

code from Layout


 <?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:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/content_frame"
       app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <include layout="@layout/ac_main"/>

    </FrameLayout>



  <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_layout"
     app:menu="@menu/app_main_drawer" />


   </android.support.v4.widget.DrawerLayout>