How to open fragment using DrawerLayout?

Question

Java

Hello. I have two fragments, DownloadFragment and HistoryFragment. Tell me how to make it so that DownloadFragment would be in the main activity, that is, Home and HistoryFragment would open in the DrawerLayout as an activity?

My activity_home.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"
    tools:context=".Home"
    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"
        app:headerLayout="@layout/header"
        app:menu="@menu/main_menu"
        android:layout_gravity="start"/>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorBackground"
        style="@style/Toolbar"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />



            <com.google.android.material.tabs.TabLayout
                android:id="@+id/tabBar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginStart="0dp"
                android:layout_marginLeft="0dp"
                android:layout_marginEnd="0dp"
                android:background="@color/colorPrimary"
                app:tabTextColor="@color/whiteTextColor"
                android:layout_marginRight="0dp"
                app:tabBackground="@drawable/tab_color_selector"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/toolbar">

                <com.google.android.material.tabs.TabItem
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/tabDownloader"
                    android:text="@string/Downloader" />

                <com.google.android.material.tabs.TabItem
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/tabHistory"
                    android:text="@string/History" />

            </com.google.android.material.tabs.TabLayout>

            <androidx.viewpager.widget.ViewPager
                android:id="@+id/viewpager"
                android:layout_width="0dp"
                android:layout_height="0dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/tabBar"
                app:layout_constraintVertical_bias="0.564">

            </androidx.viewpager.widget.ViewPager>



        <LinearLayout
            android:id="@+id/ads"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent">

            <com.google.android.gms.ads.AdView
                android:id="@+id/adView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:adSize="BANNER"
                app:adUnitId="ca-app-pub-3940256099942544/6300978111" />
        </LinearLayout>

    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.drawerlayout.widget.DrawerLayout>

My home class

public class Home extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

    Context context;
    DrawerLayout drawerLayout;
    NavigationView navigationView;
    Toolbar toolbar;

    private AdView mAdView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        context=this;
        initViews();

        drawerLayout = findViewById(R.id.drawer_layout);
        navigationView = findViewById(R.id.nav_view);
        toolbar = findViewById(R.id.toolbar);

        AdView adView = new AdView(this);
        adView.setAdSize(AdSize.BANNER);
        adView.setAdUnitId("ca-app-pub-1436196915667879/1705570006");

        MobileAds.initialize(this, new OnInitializationCompleteListener() {
            @Override
            public void onInitializationComplete(InitializationStatus initializationStatus) {
            }
        });

        mAdView = findViewById(R.id.adView);
        AdRequest adRequest = new AdRequest.Builder().build();
        mAdView.loadAd(adRequest);

        setSupportActionBar(toolbar);

        navigationView.bringToFront();
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawerLayout.addDrawerListener(toggle);
        toggle.syncState();

        navigationView.setNavigationItemSelectedListener(this);

      }

    private void initViews() {

        TabLayout tabLayout=findViewById(R.id.tabBar);
        final ViewPager viewpager=findViewById(R.id.viewpager);

        viewpager.setAdapter(new PagerAdapter(getSupportFragmentManager(),tabLayout.getTabCount()));
        viewpager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                viewpager.setCurrentItem(tab.getPosition());
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });
    }

    @Override
    public void onBackPressed() {

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

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {

        switch (menuItem.getItemId()){
            case R.id.nav_home:
                break;
            case R.id.nav_history:
                Intent profile = new Intent(Home.this, Home.class);
                startActivity(profile);
                break;

            case R.id.nav_privacy:
                AlertDialog.Builder alert = new AlertDialog.Builder(this);
                alert.setTitle( context.getResources().getString(R.string.PrivacyPolicy) );
                WebView wv = new WebView(this);
                wv.loadUrl("file:///android_asset/pp.html");
                wv.setWebViewClient(new WebViewClient() {
                    @Override
                    public boolean shouldOverrideUrlLoading(WebView view, String url) {
                        view.loadUrl(url);
                        return true;
                    }
                });
                alert.setView(wv);
                alert.setNegativeButton(context.getResources().getString(R.string.Close), new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.dismiss();
                    }
                });
                alert.show();

                return true;

            case R.id.nav_refresh:
                HistoryFragment fragment=HistoryFragment.getInstance();
                fragment.fn_video();

            default:
                return super.onOptionsItemSelected(menuItem);
        }

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

    }

}