Why does this java code in android studio shows error ?

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Java

Android4x

package com.hfad.bitspizzas;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import androidx.appcompat.widget.Toolbar;
import androidx.core.view.MenuItemCompat;
import android.view.Menu;
import android.view.MenuItem;
import android.content.Intent;
import android.widget.ShareActionProvider;

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);
    }

    @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);
        }
    }
}

What I have tried:

The code on line number 29 (bold & underlined) shows the following error :

Cannot cast :

androidx.core.view.ActionProvider' to 'android.widget.ShareActionProvider'

I have no idea why its showing so