Android 如何使用 ParseGeoPoint 创建地图标记

Question

我有一个 GeoPoint 存储在一个名为 "Request" 的解析对象中，但我不确定如何成功检索 GeoPoint 以将其传递给 LatLng 对象。我查看了文档，但在这种情况下它对我没有帮助。问题似乎是在可以从 Request 对象列表中检索 geoPoint 的 findInBackGround() 中不允许我在 onMap 方法中访问 geoPoint。我已经为此苦苦挣扎了一段时间，也许我在这里遗漏了一些东西是 class 我正在努力实现这一目标的地方：

import android.content.Intent;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.parse.FindCallback;
import com.parse.Parse;
import com.parse.ParseException;
import com.parse.ParseGeoPoint;
import com.parse.ParseObject;
import com.parse.ParseQuery;
import com.parse.ParseUser;

import java.util.List;

public class ViewMapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    LatLng businessLocation;
    ParseQuery request;
    ParseGeoPoint geoPoint;



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

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;


        request = ParseQuery.getQuery("Request");
        request.whereEqualTo("businessName", ParseUser.getCurrentUser().getUsername());
        request.findInBackground(new FindCallback<ParseObject>() {
            @Override
            public void done(List<ParseObject> objects, ParseException e) {

                if (e == null) {
                    if (objects.size() > 0) {

                        geoPoint = objects.get(0).getParseGeoPoint("GeoPoint");

                        } else {
                            Log.i("Map", "Map not displayed!");
                        }
                    }

                }

            }
        });
      if (businessLocation != null) {

                            businessLocation = new LatLng(-34, 20);
                            mMap.addMarker(new MarkerOptions().position(businessLocation).title("Your Location"));
                            mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(businessLocation, 15));

      }
    }

Answer 1

我不知道为什么这不起作用，但我希望你应该试试这个

 ParseQuery<ParseObject> request= ParseQuery.getQuery("Request");
 request.whereEqualTo("businessName", ParseUser.getCurrentUser().getUsername());
 request.findInBackground(new FindCallback<ParseObject>() {
            @Override
            public void done(List<ParseObject> objects, ParseException e) {

                if (e == null) {
                    if (objects.size() > 0) {

                        for (ParseObject obj: objects) {
                            geoPoint = obj.getParseGeoPoint("GeoPoint");
                        }
                    }

Answer 2

我能够弄明白，我不知道是什么导致了问题，但是删除 if(businessLocation != null) 允许填充 LatLng。

 @Override
    public void onMapReady(final GoogleMap googleMap) {
        mMap = googleMap;


        ParseQuery<ParseObject> query = ParseQuery.getQuery("Request");
        query.whereEqualTo("businessName", ParseUser.getCurrentUser().getUsername());
        query.findInBackground(new FindCallback<ParseObject>() {
            @Override
            public void done(List<ParseObject> objects, ParseException e) {
                if (e == null) {
                    if (objects.size() > 0) {

                                geoPoint = objects.get(0).getParseGeoPoint("GeoPoint");

                                        businessLocation = new LatLng(geoPoint.getLatitude(), geoPoint.getLongitude());

                                        //mMap.clear();
                                        mMap.addMarker(new MarkerOptions().position(businessLocation).title("Your Location!"));
                                        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(businessLocation, 9));

                                } else {
                                    Toast.makeText(ViewMapsActivity.this, "No objects found.", Toast.LENGTH_SHORT).show();
                                }

                    }
                }

        });



    }

Android 如何使用 ParseGeoPoint 创建地图标记

Android How to create a map marker using a ParseGeoPoint

android

google-maps

parse-platform