我试图在androidstudio中学习代码，但是我在活动方面遇到了问题。
我有一个谷歌Map代码，我要添加到导航抽屉，但我不能，因为错误总是说mapsactivity不能被强制转换到androidx.fragment.app.fragment
这是我的mapactivity.java

package***.***.***.ui.map;
import androidx.fragment.app.FragmentActivity;
import android.annotation.SuppressLint;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.WindowManager;
import android.widget.TextView;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;

import java.io.IOException;
import java.util.List;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private Object LocationServices;
    GoogleMap mMap;
    private GoogleMap.OnCameraIdleListener onCameraIdleListener;
    private TextView resutText;

    @Override
    public void onResume() {
        super.onResume();
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(***.***.***.R.id.map);
        mapFragment.getMapAsync(this);
        resutText = (TextView) findViewById(***.***.***.R.id.dragg_result);
        configureCameraIdle();
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        mMap.setOnCameraIdleListener(onCameraIdleListener);
        googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
        LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        String locationProvider = LocationManager.NETWORK_PROVIDER;
        @SuppressLint("MissingPermission") android.location.Location lastKnownLocation = locationManager.getLastKnownLocation(locationProvider);
        double userLat = lastKnownLocation.getLatitude();
        double userLong = lastKnownLocation.getLongitude();
        LatLng user = new LatLng(userLat, userLong);
        googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(userLat, userLong), 16.0f));
    }
    private void configureCameraIdle() {
        onCameraIdleListener = new GoogleMap.OnCameraIdleListener() {
            @Override
            public void onCameraIdle() {

                LatLng latLng = mMap.getCameraPosition().target;
                Geocoder geocoder = new Geocoder(MapsActivity.this);

                try {
                    List<Address> addressList = geocoder.getFromLocation(latLng.latitude, latLng.longitude, 1);
                    if (addressList != null && addressList.size() > 0) {
                        String locality = addressList.get(0).getAddressLine(0);
                        String country = addressList.get(0).getCountryName();
                        if (!locality.isEmpty() && !country.isEmpty())
                            resutText.setText(locality + "  " + country);
                    }

                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        };
    }

    protected void setStatusBarTranslucent(boolean makeTranslucent) {
        if (makeTranslucent) {
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        } else {
            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        }
    }

}

以及activity\u maps.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MapsActivity" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:layout_marginStart="172dp"
        android:layout_marginTop="310dp"
        android:layout_marginEnd="172dp"
        android:layout_marginBottom="356dp"
        android:adjustViewBounds="true"
        android:maxWidth="65dp"
        android:maxHeight="65dp"
        android:src="@drawable/car_pin" />
    <!-- Implementation of find my location button -->

    <TextView
        android:id="@+id/dragg_result"
        android:layout_width="260dp"
        android:layout_height="84dp"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:layout_marginStart="75dp"
        android:layout_marginTop="74dp"
        android:layout_marginEnd="75dp"
        android:layout_marginBottom="572dp"
        android:text="TextView" />

    <fragment
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/mobile_navigation" />

</RelativeLayout>

还有mainactivity.java

package***.***.***;

import android.os.Bundle;
import android.view.View;
import android.view.Menu;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import com.google.android.material.navigation.NavigationView;

import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

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);
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        mAppBarConfiguration = new AppBarConfiguration.Builder(
                R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow)
                .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) {
        // Inflate the menu; this adds items to the action bar if it is present.
        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();
    }

}

我能做些什么使它工作而不重做所有的代码，提前感谢。