better_approach.java

public class MainActivity extends AppCompatActivity{

    final FragmentManager fragmentManager = getSupportFragmentManager();
    
    Fragment active_fragment;
    SongsFragment songs_fragment;
    ArtistsFragment artists_fragment;
    AlbumsFragment albums_fragment;

    @Override
    protected final void onCreate(@NonNull Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.seller_activity);

        songs_fragment = new SellerProducts();
        fragmentManager.beginTransaction().add(R.id.container, songs_fragment, "Songs").commit();
        active_fragment = songs_fragment;
        
    }
    
    private final BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
            = item -> {

        switch (item.getItemId()) {
            case R.id.songs:
                if(fragmentManager.findFragmentByTag("Songs")==null) {
                    songs_fragment = new SellerProducts();
                    fragmentManager.beginTransaction().add(R.id.container, songs_fragment, "Songs").hide(songs_fragment).commit();
                }
                fragmentManager.beginTransaction().hide(active_fragment).show(songs_fragment).commit();
                active_fragment = sellerShop_fragment;
                return true;

            case R.id.artists:
                if(fragmentManager.findFragmentByTag("Artists")==null) {
                    artists_fragment = new ArtistsFragment();
                    fragmentManager.beginTransaction().add(R.id.container, artists_fragment, "Artists").hide(artists_fragment).commit();
                }
                fragmentManager.beginTransaction().hide(active_fragment).show(artists_fragment).commit();
                active_fragment = artists_fragment;
                return true;

            case R.id.albums:
                if(fragmentManager.findFragmentByTag("Albums")==null) {
                    albums_fragment = new AlbumsFragment();
                    fragmentManager.beginTransaction().add(R.id.container, albums_fragment, "Orders").hide(albums_fragment).commit();
                }
                fragmentManager.beginTransaction().hide(active_fragment).show(albums_fragment).commit();
                active_fragment = albums_fragment;
                return true;
        }

        return false;
    };
    
}