Getting an error in Bitz and pizza app that i am using to build it with Head first android development book

Question

When i am adding viewpager using fragment pager adapter....it show error ,all the code looks fine but in mainactivity.java its an error.

I think mainly the problem is in the import function, which is used in older version ....but i can't find anything in any of the browsers(google and youtube etc.

My code of main activity is this:-

 package com.hfad.bitzandpizza;

 import androidx.appcompat.app.AppCompatActivity;

 import androidx.fragment.app.FragmentManager;

 import android.content.Intent;

 import android.os.Bundle;

 import android.view.Menu;

 import android.view.MenuItem;

 import androidx.appcompat.widget.ShareActionProvider;

  import androidx.appcompat.widget.Toolbar;

  import androidx.core.view.MenuItemCompat;

 import androidx.fragment.app.Fragment;

 import androidx.fragment.app.FragmentPagerAdapter;

 import androidx.viewpager.widget.ViewPager;

 public class MainActivity extends AppCompatActivity {

private ShareActionProvider shareActionProvider;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    SectionspagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
    ViewPager pager = (ViewPager) findViewById(R.id.pager);
    pager.setAdapter(pagerAdapter);
}

    @Override
public boolean onCreateOptionsMenu(Menu menu){
    getMenuInflater().inflate(R.menu.menu_main, menu);
    MenuItem menuItem = menu.findItem(R.id.action_share);
    shareActionProvider = (ShareActionProvider) 
    MenuItemCompat.getActionProvider(menuItem);
    setShareActionIntent("Want to join me for pizza?");
    return super.onCreateOptionsMenu(menu);
  }


   private void setShareActionIntent(String text){
    Intent intent = new Intent((Intent.ACTION_SEND));
    intent.setType("text/plain");
    intent.putExtra(Intent.EXTRA_TEXT ,text);
    shareActionProvider.setShareIntent(intent);
  }

  @Override
public boolean onOptionsItemSelected(MenuItem item){
    switch (item.getItemId()){
        case R.id.action_create_order:
            Intent intent = new Intent(this , OrderActivity.class);
            startActivity(intent);
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
 }


    private class SectionsPagerAdapter extends FragmentPagerAdapter{
    public SectionsPagerAdapter(FragmentManager fm){
        super(fm);
    }

    @Override
public int getCount(){
        return 4;
    }

    @Override
public Fragment getItem(int position){
        switch (position){
            case 0 :
                return  new TopFragment();
            case 1:
                return new PizzaFragment();
            case 2:
                return new PastaFragment();
            case 3:
                return new StoresFragment();
        }
        return null;
    }
  }

 }

please check this....to find an error it ruins my 2 days .....

Thankyou very much🙏🤗

first error is descripted pager adapter

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these are all the error I have encountered......