【发布时间】：2021-12-31 00:36:28
【问题描述】：
我收到此错误，但找不到原因。我尝试从 Firebase 检索经纬度。这是我的 Java 类代码：
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;
}
}
这是我的适配器代码：
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;
}
}
【问题讨论】：
-
在问题中发布完整的错误。
处出错
标签： java android firebase google-maps firebase-realtime-database