Android Studio 中无法放大到当前位置

Question

public class Game_Activity extends FragmentActivity implements OnMapReadyCallback {

    private Location currentLocation;
    private FusedLocationProviderClient fusedClient;
    private static final int REQUEST_CODE =101;
    private FrameLayout map;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_game);
        map=findViewById(R.id.map);

        fusedClient = LocationServices.getFusedLocationProviderClient(this);
        getLocation();
    }
    private void getLocation() {
        if (ActivityCompat.checkSelfPermission(
                this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(
                this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION},
                    REQUEST_CODE);
            return;
        }

            Task<Location> task = fusedClient.getLastLocation();

            task.addOnSuccessListener(new OnSuccessListener<Location>() {
                @Override
                public void onSuccess(Location location) {
                    if (location != null) {
                        currentLocation = location;
                        SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
                        assert supportMapFragment != null;
                        supportMapFragment.getMapAsync(Game_Activity.this);
                    }
                }
            });
    }


    @Override
    public void onMapReady(GoogleMap googleMap) {
        googleMap.getUiSettings().setScrollGesturesEnabled(false);
            LatLng latLng = new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude());
            MarkerOptions markerOptions = new MarkerOptions().position(latLng).title("Player");
            googleMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
            googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 15));
            googleMap.addMarker(markerOptions);
    }
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,@NonNull int[] grantResults){
        super.onRequestPermissionsResult(requestCode,permissions,grantResults);
        if(requestCode == REQUEST_CODE) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                getLocation();
            }
        }
    }

}

这是我的代码，我试图为其制作一张地图，以便在启动它时将其缩放到我当前的位置（就像在 pokemon go 中一样），但它没有放大。我尝试调试并在成功方法中找到位置似乎保持为空，有人有任何修复吗？

解决问题

Answer 1

您可能收到空的当前位置。查看此[位置回调][1] https://developer.android.com/develop/sensors-and-location/location/request-updates 以获取最新位置