java - 谷歌地图标记标题显示的是完整列表

Question

我现在正在使用谷歌地图项目，我从 firebase 获取我的数据，我能够在本网站所有开发人员的帮助下绘制多个标记，一件事是在绘制这些标记时我的标记标题是相同的， “相同”意味着我所有的标记都有相同的标题请查看我的图片

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    private GoogleMap googleMap;
    private MarkerOptions options = new MarkerOptions();
    private ArrayList<LatLng> latlngs = new ArrayList<>();
    private ArrayList<String> Names = new ArrayList<>();
    String Lat ,Lon,Names1;
    double latitude , longitude;







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





        FirebaseDatabase database = FirebaseDatabase.getInstance();
        DatabaseReference myRef = database.getReference("Positions");
        myRef.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                for (DataSnapshot chidSnap : dataSnapshot.getChildren()) {

                     // System.out.println(chidSnap.getKey()); //displays the key for the node
                    // System.out.println(chidSnap.child("Latitude").getValue());
                    // System.out.println( chidSnap.child("Longitude").getValue());   //gives the value for given keyname


                    //some latitude and logitude value

                    //  System.out.println(latlngs);   //gives the value for given keyname

                    Lat = String.valueOf(chidSnap.child("Latitude").getValue());
                    Lon = String.valueOf(chidSnap.child("Longitude").getValue());
                    Names1 = String.valueOf(chidSnap.getKey());

                    latitude= Double.parseDouble(Lat);
                    longitude= Double.parseDouble(Lon);
                    latlngs.add(new LatLng(latitude, longitude));
                    Names.add(Names1);
                }


                if(mMap != null) {




                    for (LatLng point : latlngs) {
                        options.position(point);
                        options.title(String.valueOf(Names));
                        options.snippet("someDesc");
                        mMap.addMarker(options);
                    }
                }



            }
            @Override
            public void onCancelled(DatabaseError databaseError) {
            }
        });


       // System.out.println(Names);


    }









    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    @Override
    public void onMapReady(GoogleMap googleMap) {



        mMap = googleMap;




        for (LatLng point : latlngs) {
            options.position(point);
            options.title(String.valueOf(Names));
            options.snippet("someDesc");
            googleMap.addMarker(options);
        }


    }
}

上面是我的 MapsActivity。我期望的是一个标记应命名为 Lex B05 ，另一用户应命名为 amanda 谢谢提前寻求您的帮助!..

Answer 1

因为您将相同的 arrayList 名称传递给所有标记，所以在添加标记时尝试以下代码

for (int i=0;i< latlngs.size();i++) {
            LatLng point=latlngs.get(i);
            options.position(point);
            options.title(Names.get(i));
            options.snippet("someDesc");
            mMap.addMarker(options);
        }

希望这会有所帮助!!