Android Navigation Drawer Menu

 Creating Android Navigation Drawer Menu is a complex task involving bunch of steps.

So, let's start.

1) In activity_main.xml file change the root level layout to DrawerLayout. So whatever layout is there, make it DrawerLayout at the very beginning.

2) Add NavigationView before the closing TAG of DrawerLayout

<com.google.android.material.navigation.NavigationView
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:fitsSystemWindows="true"
    android:id="@+id/navigationView" />

3) Add following properties inside the opening DrawerLayout

android:fitsSystemWindows="true"
tools:openDrawer="start"
4) Now Create a LayoutResouceFile and name it as header.xml. We will use this file 
as the header for DrawerLayout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:orientation="vertical"
    android:background="@drawable/background"
    android:gravity="bottom"
    android:padding="20dp">

    <ImageView
        android:layout_width="75dp"
        android:layout_height="75dp"
        android:src="@drawable/launcher_icon"
        android:visibility="visible"/>

    <TextView
        android:id="@+id/txtName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fontFamily="@font/baloo"
        android:textColor="@color/colorUserName"
        android:paddingTop="@dimen/paddingTop"
        android:text="@string/app_name"
        android:textSize="@dimen/caption" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fontFamily="@font/aclonica"
        android:textColor="@color/colorUserName"
        android:text="domain.in"
        android:textSize="@dimen/mediumText" />
</LinearLayout>

When you run, you will find few missing attributes. Add them one after another. 

4) Add headerLayout attribute within NavigationView

app:headerLayout="@layout/header"

5) Now create a new LayoutResouceFile, viz menu under res directory
Add Layout File, viz we will name it as main_menu.xml
<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <group android:checkableBehavior="single">

        <item android:title="Information">
            <menu>
                <item
                    android:id="@+id/nav_logout"
                    android:icon="@drawable/logout"
                    android:title="Logout" />

            </menu>

        </item>

    </group>

    <group android:id="@+id/nav_footer">
        <item
            android:id="@+id/nav_version"
            android:icon="@drawable/appversion"
            android:title="Version" />
    </group>
</menu>

6) Now inside NavigationView add following :
app:menu="@menu/main_menu"

7) Set NoActionBar inside themes.xml

8) Now go to MainActivity.java
Add following two lines inside strings.xml file at first
<string name="open_drawer">Open Navigation Drawer</string>
<string name="close_drawer">Close Navigation Drawer</string>
Now go to MainActivity.java and add following:
Define following objects
DrawerLayout drawerLayout;
NavigationView navigationView;

Inside onCreate Method write
drawerLayout = findViewById(R.id.drawerLayout);
navigationView = findViewById(R.id.navigationView);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this,
        drawerLayout, toolbar, R.string.open_drawer, R.string.close_drawer);
drawerLayout.addDrawerListener(toggle);
toggle.syncState();

navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        int id = item.getItemId();
        if ( id == R.id.nav_logout) {
            // logout(); // Define Logout action / any action you prefer
        }

        drawerLayout.closeDrawer(GravityCompat.START);
return true;
    }
});

Also Add onbackPressed() method within MainActivity.java to handle what happens when user presses back button.

@Override
public void onBackPressed() {

    if(drawerLayout.isDrawerOpen(GravityCompat.START)) {
        drawerLayout.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}