如何在onMapReady方法中访问onLocationChanged中的当前位置？

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback, LocationListener {
    private GoogleMap mMap;
    private LatLng currentLocation;

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

        // 获取地图对象
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        // 初始化位置服务
        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        // 在地图上显示当前位置
        if (currentLocation != null) {
            mMap.moveCamera(CameraUpdateFactory.newLatLng(currentLocation));
        }
    }

    @Override
    public void onLocationChanged(Location location) {
        // 更新当前位置
        currentLocation = new LatLng(location.getLatitude(), location.getLongitude());
    }

    // 其他LocationListener的回调方法...

    // 其他代码...
}