致命錯誤com.google.firebase.database.DatabaseException：無法將java.lang.String型別的值轉換為long

我收到此錯誤，但找不到原因。我嘗試從 Firebase 檢索經緯度。這是我的 Java 類代碼：

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, GoogleMap.OnMarkerClickListener {

    private GoogleMap mMap;
    FirebaseFirestore db;
    private DatabaseReference mUsers;
    private ChildEventListener mChildEventListener;
    Marker marker;

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

        // initializing our firebase firestore.
        db = FirebaseFirestore.getInstance();

        // 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);
        ChildEventListener mChildEventListener;
        mUsers = FirebaseDatabase.getInstance().getReference("Locations");
        mUsers.push().setValue(marker);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
        googleMap.setOnMarkerClickListener(this);
        googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
        mUsers.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                if(snapshot.exists()) {
                    for (DataSnapshot dataSnapshot:snapshot.getChildren()) {
                        MapAdapter mapAdapter = dataSnapshot.getValue(MapAdapter.class);
                        LatLng location = new LatLng(mapAdapter.latitude, mapAdapter.longitude);
                        mMap.addMarker(new MarkerOptions().position(location)).setIcon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_YELLOW));

                    }
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError error) {

            }
        });


    }

    @Override
    public boolean onMarkerClick(Marker marker) {
        return false;
    }
}

這是我的配接器代碼：

public class MapAdapter {
     public Long latitude,longitude ;

    public MapAdapter() {

    }

    public Long getLatitude() {
        return latitude;
    }

    public void setLatitude(Long latitude) {
        this.latitude = latitude;
    }

    public Long getLongitude() {
        return longitude;
    }

    public void setLongitude(Long longitude) {
        this.longitude = longitude;
    }
}

為了解決這個問題，你要么將資料庫中欄位的型別更改為數字，而代碼保持原樣，要么MapAdapter像這樣更改類：

public class MapAdapter {
    public String latitude, longitude;

    public MapAdapter() {}

    public String getLatitude() {
        return latitude;
    }

    public void setLatitude(String latitude) {
        this.latitude = latitude;
    }

    public String getLongitude() {
        return longitude;
    }

    public void setLongitude(String longitude) {
        this.longitude = longitude;
    }
}

您還可以像這樣更改代碼：

MapAdapter mapAdapter = dataSnapshot.getValue(MapAdapter.class);
long latitude = Long.parseLong(mapAdapter.latitude);
long longitude = Long.parseLong(mapAdapter.longitude);
LatLng location = new LatLng(latitude, longitude);

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