Android仅在屏幕上为地图添加标记

Question

在我的应用程序上，我将通过更多不同的json响应在谷歌地图上添加更多标记。 现在我使用Retrofit来调用终点，回复json响应并在谷歌地图上添加标记，这是我的代码：

private void getPlacemark(){
    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("https://example.com/api/v2.1")
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    Retrofit retrofit1 = new Retrofit.Builder()
            .baseUrl("https://api.citybik.es/v2/networks/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();


    APIService service = retrofit.create(APIService.class);
    Call<ResponsePlacemarks> call = service.getPlacemark();

    APIService service1 = retrofit1.create(APIService.class);
    Call<NetworkResponse> call1 = service.getNetwork();



    call.enqueue(new Callback<ResponsePlacemarks>() {
        @Override
        public void onResponse(Response<ResponsePlacemarks> response, Retrofit retrofit) {
            Log.d("risposta: ",new Gson().toJson(response));
            try {
                //mMap.clear();
                // This loop will go through all the results and add marker on each location.
                for (int i = 0; i < response.body().getPlacemarks().size(); i++) {
                    Double lat = response.body().getPlacemarks().get(i).getCoordinates().get(1);
                    Double lng = response.body().getPlacemarks().get(i).getCoordinates().get(0);
                    String placeName = response.body().getPlacemarks().get(i).getAddress();

                    MarkerOptions markerOptions = new MarkerOptions();
                    LatLng latLng = new LatLng(lat, lng);
                    // Position of Marker on Map
                    markerOptions.position(latLng);
                    // Adding Title to the Marker
                    markerOptions.title(placeName);

                    markerOptions.icon(BitmapDescriptorFactory.fromResource(R.mipmap.pin_green));
                    // Adding Marker to the Camera.
                    Marker m = mMap.addMarker(markerOptions);
                    //mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
                    //mMap.animateCamera(CameraUpdateFactory.zoomTo(14));
                }
            } catch (Exception e) {
                Log.d("onResponse", "There is an error");
                e.printStackTrace();
            }
        }

        @Override
        public void onFailure(Throwable t) {

        }
    });

    call1.enqueue(new Callback<NetworkResponse>() {
        @Override
        public void onResponse(Response<NetworkResponse> response, Retrofit retrofit) {
            //Log.d("risposta_bike: ",new Gson().toJson(response));
            try {
                //mMap.clear();
                // This loop will go through all the results and add marker on each location.
                for (int i = 0; i < response.body().getNetwork().getStations().size(); i++) {
                    Double lat = response.body().getNetwork().getStations().get(i).getLatitude();
                    Double lng = response.body().getNetwork().getStations().get(i).getLongitude();
                    int placeName = response.body().getNetwork().getStations().get(i).getFreeBikes();
                    MarkerOptions markerOptions1 = new MarkerOptions();
                    LatLng latLng = new LatLng(lat, lng);
                    // Position of Marker on Map
                    markerOptions1.position(latLng);
                    // Adding Title to the Marker
                    markerOptions1.title("Bici disponibili: " + placeName);

                    markerOptions1.icon(BitmapDescriptorFactory.fromResource(R.mipmap.gray_pin));
                    // Adding Marker to the Camera.
                    Marker mm = mMap.addMarker(markerOptions1);
                }
            } catch (Exception e) {
                Log.d("onResponse", "There is an error");
                e.printStackTrace();
            }
        }

        @Override
        public void onFailure(Throwable t) {

        }
    });



}

现在我只打电话给这个2终点，我在地图上有更多的标记，在胎儿中我将添加更多标记。 所以我想我可以改变我的代码，并在json resposnse添加所有标记，因为它们在屏幕上移动并移除标记，因为它们离开屏幕，显示当前在用户感知的GoogleMap可视范围内的标记，如这个程序：

Ally App

以及如何仅在范围缩放中显示标记，例如（缩放＆gt; 10）

这是我添加谷歌地图的代码：

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    v = inflater.inflate(R.layout.menu1, container, false);
    ((MainActivity) getActivity()).setToolbarTitle("Mobility");





    SupportMapFragment mapFragment = (SupportMapFragment) this.getChildFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);




    return v;
}

@Override
public void onMapReady(GoogleMap googleMap) {

    mMap = googleMap;

    boolean success = mMap.setMapStyle(new MapStyleOptions(getResources()
            .getString(R.string.style_json)));
    getPlacemark();

    if (!success) {
        Log.e(TAG, "Style parsing failed.");
    }



    //Initialize Google Play Services
    if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (ContextCompat.checkSelfPermission(getContext(),
                Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
            //Location Permission already granted
            buildGoogleApiClient();
            mMap.setMyLocationEnabled(true);
        } else {
            //Request Location Permission
            checkLocationPermission();
        }
    }
    else {
        buildGoogleApiClient();
        mMap.setMyLocationEnabled(true);
    }

}

任何帮助和想法？ 感谢