[英]How to update marker positions with data from Firebase Google Maps API Android
[英]How to add Google Maps marker from Firebase data?
我正在嘗試創建一個從Firebase加載標記的地圖。
我已將位置代碼分為2個不同的代碼:location_left和location_right。
這意味着正常的標記線將如下所示:
LatLng cod = new LatLng(location_left, location_right);
googleMap.addMarker(new MarkerOptions().position(cod).title(party_title));
但它不起作用。 應用程序崩潰。
這是代碼:
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private static final String FIREBASE_URL="https://haerev.firebaseio.com/";
private Firebase firebaseRef;
private GoogleMap mMap=((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps2);
Firebase.setAndroidContext(this);
firebaseRef = new Firebase(FIREBASE_URL);
// 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);
}
@Override
public void onMapReady(final GoogleMap googleMap) {
firebaseRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot child : dataSnapshot.child("users").getChildren()) {
String rightLocation = child.child("location_right").getValue().toString();
String leftLocation = child.child("location_left").getValue().toString();
double location_left = Double.parseDouble(leftLocation);
double location_right = Double.parseDouble(rightLocation);
String party_title = child.child("party/party_title").getValue().toString();
LatLng cod = new LatLng(location_left, location_right);
googleMap.addMarker(new MarkerOptions().position(cod).title(party_title));
}
}
@Override
public void onCancelled(FirebaseError firebaseError) {
}
});
}
}
刪除此行:
private GoogleMap mMap=((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
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