Android navigation drawer inside fragment.

fragment_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">
    
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <include layout="@layout/toolbar" />
        
        <!-- Actual fragment content -->

    </LinearLayout>

    <android.support.design.widget.NavigationView
        android:id="@+id/navigation_drawer"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="@android:color/white"
        app:menu="@menu/drawer_view" />

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

MainFragment.java

public class MainFragment extends Fragment {
    private DrawerLayout mDrawer;
    private Toolbar mToolbar;
    private ActionBarDrawerToggle mDrawerToggle;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_main, container, false);

        mToolbar = (Toolbar) view.findViewById(R.id.toolbar);
        AppCompatActivity activity = (AppCompatActivity) getActivity();
        activity.setSupportActionBar(mToolbar);

        mDrawer = (DrawerLayout) view.findViewById(R.id.drawer_layout);
        mDrawerToggle = new ActionBarDrawerToggle(
                getActivity(), mDrawer, R.string.drawer_open, R.string.drawer_close);

        // Where do I put this?
        mDrawerToggle.syncState();

        return view;
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.menu_main, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        
        switch (item.getItemId()) {
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}

toolbar.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />

</android.support.design.widget.AppBarLayout>

How to handle backpressed if navigation drawer is inside fragment.....
i.e I want to close the navigation drawer first if back pressed from main activity.but problem is all this is ...my main activity is itself a fragment

so weird . I'm new in android. I use Kotlin for android. I search about 3 hours .I had got mad for importing navigation drawer to just one of my fragment !! everything I did it caused that error : "java.lang.IllegalArgumentException: DrawerLayout must be measured with MeasureSpec.EXACTLY. " for this I used specific height for its parent layout. like 35dp. after that it showed NavigationView menu drawer but it was in small height . I mean NavigationView height was same as DrawerLayout 35dp . Completely incorrect. I was to lucky to finding your GitHub codes , that was for 5 years ago ! wow. I find out my whole layout should be between DrawerLayout Tag. instead of " " in your code. I have coordinator layout as root layout and many recyclerview and nested scrollview. I was to confused. I tried to import all navigation and drawable layout between them. android programing is too hard for after many years programming in other platform . I have not found that rules yet too complex rules or implementing component in UI and logic.. Thank you for sharing your knowledge.

Waste

code is waste don't use it