在Gmap (Google Maps Android API)中绘制路线上的坐标

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MapStyleOptions;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback {
    private MapView mapView;
    private GoogleMap googleMap;

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

        mapView = findViewById(R.id.mapView);
        mapView.onCreate(savedInstanceState);
        mapView.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap map) {
        googleMap = map;
        googleMap.setMapStyle(MapStyleOptions.loadRawResourceStyle(this, R.raw.map_style));

        LatLng startPoint = new LatLng(37.7749, -122.4194);
        LatLng endPoint = new LatLng(37.3352, -121.8811);

        googleMap.addMarker(new MarkerOptions().position(startPoint).title("Start"));
        googleMap.addMarker(new MarkerOptions().position(endPoint).title("End"));

        PolylineOptions polylineOptions = new PolylineOptions()
                .add(startPoint)
                .add(new LatLng(37.7749, -122.5194))
                .add(new LatLng(37.7749, -122.6194))
                .add(endPoint)
                .color(R.color.polyline_color)
                .width(10);

        Polyline polyline = googleMap.addPolyline(polylineOptions);

        googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(startPoint, 12));
    }

    @Override
    public void onResume() {
        super.onResume();
        mapView.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mapView.onPause();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mapView.onDestroy();
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        mapView.onLowMemory();
    }
}