地図を表示させるアプリを作ろう！Android studio を使って地図にテキストピンを立てる方法

package com.example.map1;

import androidx.fragment.app.FragmentActivity;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Bundle;

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.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.example.map1.databinding.ActivityMapsBinding;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    private ActivityMapsBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        binding = ActivityMapsBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        // 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);
    }

    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        // Add a marker in Sydney and move the camera
        LatLng sydney = new LatLng(-34, 151);
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney").icon(getTextMarker("Hello")));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    }
    public BitmapDescriptor getTextMarker(String text) {

        Paint paint = new Paint();
        /* Set text size, color etc. as needed */
        paint.setTextSize(36);

        int width = (int)paint.measureText(text);
        int height = (int)paint.getTextSize();

        paint.setTextAlign(Paint.Align.CENTER);
        // Create a transparent bitmap as big as you need
        Bitmap image = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(image);
        // During development the following helps to see the full
        // drawing area:
        canvas.drawColor(0x50A0A0A0);
        // Start drawing into the canvas
        canvas.translate(width / 2f, height);
        canvas.drawText(text, 0, 0, paint);
        BitmapDescriptor icon = BitmapDescriptorFactory.fromBitmap(image);
        return icon;
    }
}

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        // Add a marker in Sydney and move the camera
        LatLng sydney = new LatLng(-34, 151);
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney").icon(getTextMarker("Hello")));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    }

        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney").icon(getTextMarker("Hello")));

public BitmapDescriptor getTextMarker(String text) {

        Paint paint = new Paint();
        /* Set text size, color etc. as needed */
        paint.setTextSize(36);

        int width = (int)paint.measureText(text);
        int height = (int)paint.getTextSize();

        paint.setTextAlign(Paint.Align.CENTER);
        // Create a transparent bitmap as big as you need
        Bitmap image = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(image);
        // During development the following helps to see the full
        // drawing area:
        canvas.drawColor(0x50A0A0A0);
        // Start drawing into the canvas
        canvas.translate(width / 2f, height);
        canvas.drawText(text, 0, 0, paint);
        BitmapDescriptor icon = BitmapDescriptorFactory.fromBitmap(image);
        return icon;
    }