How to use NavigationView in Android ?

•    Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.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">
   <com.google.android.material.navigation.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_main"
      app:menu="@menu/activity_main_drawer" />
   <include
      layout="@layout/app_bar_main"
      android:layout_width="match_parent"
      android:layout_height="match_parent" />
</androidx.drawerlayout.widget.DrawerLayout>

•     Add the following code to src/MainActivity.java

import android.os.Bundle;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import android.view.View;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import com.google.android.material.navigation.NavigationView;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.view.Menu;
public class MainActivity extends AppCompatActivity {
   private AppBarConfiguration mAppBarConfiguration;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      Toolbar toolbar = findViewById(R.id.toolbar);
      setSupportActionBar(toolbar);
      FloatingActionButton fab = findViewById(R.id.fab);
      fab.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG).setAction("Action", null).show();
         }
      });
      DrawerLayout drawer = findViewById(R.id.drawer_layout);
      NavigationView navigationView = findViewById(R.id.nav_view);
      mAppBarConfiguration = new AppBarConfiguration.Builder(
         R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow, R.id.nav_tools, R.id.nav_share,
         R.id.nav_send).setDrawerLayout(drawer).build();
      NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
      NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
      NavigationUI.setupWithNavController(navigationView, navController);
   }
   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
      getMenuInflater().inflate(R.menu.main, menu);
      return true;
   }
   @Override
   public boolean onSupportNavigateUp() {
      NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
      return NavigationUI.navigateUp(navController, mAppBarConfiguration) || super.onSupportNavigateUp();
   }
}

•     Create a Layout resource file (fragment_home.xml) and the following code −

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   android:layout_width="match_parent"
   android:layout_height="match_parent">
   <TextView
      android:id="@+id/text_home"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_marginStart="8dp"
      android:layout_marginTop="8dp"
      android:layout_marginEnd="8dp"
      android:textAlignment="center"
      android:textSize="20sp"
      app:layout_constraintEnd_toEndOf="parent"
      app:layout_constraintStart_toStartOf="parent"
      app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

•     Create a Java class (HomeFragment.java) and add the following code −

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.Nullable;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;
import app.com.myapplication.R;
public class HomeFragment extends Fragment {
   private HomeViewModel homeViewModel;
   public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      homeViewModel = ViewModelProviders.of(this).get(HomeViewModel.class);
      View root = inflater.inflate(R.layout.fragment_home, container, false);
      final TextView textView = root.findViewById(R.id.text_home);
      homeViewModel.getText().observe(this, new Observer<String>() {
         @Override
         public void onChanged(@Nullable String s) {
            textView.setText(s);
         }
      });
      return root;
   }
}

•     Create a Java class (HomeViewModel.java) and add the following code −

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.Nullable;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;
import app.com.myapplication.R;
public class HomeFragment extends Fragment {
   private HomeViewModel homeViewModel;
   public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      homeViewModel = ViewModelProviders.of(this).get(HomeViewModel.class);
      View root = inflater.inflate(R.layout.fragment_home, container, false);
      final TextView textView = root.findViewById(R.id.text_home);
      homeViewModel.getText().observe(this, new Observer<String>() {
         @Override
         public void onChanged(@Nullable String s) {
            textView.setText(s);
         }
      });
      return root;
   }
}

•     Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.myapplication">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity
         android:name=".MainActivity"
         android:label="@string/app_name"
         android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
         </activity>
      </application>
</manifest>