如何在谷歌地图应用编程接口v3(android)中自动缩放当前位置并始终将焦点放在该位置上？

import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.support.v4.content.ContextCompat;

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
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;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private static final int LOCATION_PERMISSION_REQUEST_CODE = 1;

    private GoogleMap mMap;
    private FusedLocationProviderClient mFusedLocationClient;
    private LocationCallback mLocationCallback;

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

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

        // 初始化位置服务客户端
        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);

        // 创建位置变化的监听器
        mLocationCallback = new LocationCallback() {
            @Override
            public void onLocationResult(LocationResult locationResult) {
                if (locationResult == null) {
                    return;
                }
                for (Location location : locationResult.getLocations()) {
                    // 更新地图焦点位置
                    updateMapFocus(location);
                }
            }
        };
    }

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

        // 检查位置权限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
            // 获取当前位置
            mFusedLocationClient.getLastLocation()
                    .addOnSuccessListener(this, location -> {
                        if (location != null) {
                            // 更新地图焦点位置
                            updateMapFocus(location);
                        }
                    });
            // 开始监听位置变化
            startLocationUpdates();
        } else {
            // 请求位置权限
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                    LOCATION_PERMISSION_REQUEST_CODE);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        if (requestCode == LOCATION_PERMISSION_REQUEST_CODE) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // 获取当前位置
                mFusedLocationClient.getLastLocation()
                        .addOnSuccessListener(this, location -> {
                            if (location != null) {
                                // 更新地图焦点位置
                                updateMapFocus(location);
                            }
                        });
                // 开始监听位置变化
                startLocationUpdates();
            }
        }
    }

    private void startLocationUpdates() {
        // 创建位置请求
        LocationRequest locationRequest = LocationRequest.create()
                .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                .setInterval(10000)
                .setFastestInterval(5000);

        // 请求位置更新
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
            mFusedLocationClient.requestLocationUpdates(locationRequest,
                    mLocationCallback,
                    null /* Looper */);
        }
    }

    private void updateMapFocus(Location location) {
        // 获取当前位置的经纬度
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());

        // 设置地图焦点位置和缩放级别
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 15));
    }
}

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />