从Firebase检索位置，然后在Android应用程序的Google Map API上放置标记

问题描述

我正在创建一个在线混乱应用程序，其中有两次针对混乱所有者的登录，一次针对用户的登录，因此当混乱所有者在其数据中放置位置时，应该在用户端的地图上标记.

I'm creating a online mess application where there are two logins one for mess owner and another for user so when mess owner put location in his data there should be marker on map in user side.

这是图像中的数据库结构数据库结构

here is structure of database in imageDatabase structure

请建议我编写代码以访问那些经度n值，并为每个注册了位置值的烂摊子在地图上创建标记.

please suggest me code to access those latitude n longitude values and create marker on map for each mess registered with location values.

推荐答案

已编辑正在提议对数据库结构进行少量调整...在"MessProviders"下，使用userID，mProviderLatitude，mProviderLongitude，mProviderBrandName创建另一个名为"locations"的节点. .如果您为getter和setter设置了单独的类，那将是很好的.我的课程是"CordinatesModel"

EDITEDAm proposing a small adjustment to the database structure...under 'MessProviders' create another node called 'locations' with the userID,mProviderLatitude,mProviderLongitude, mProviderBrandName. .It would be good if you had a separate class for getters and setters. My class for that is 'CordinatesModel'

private void messLocation() {
DatabaseReference currentDBcordinates = FirebaseDatabase.getInstance().getReference().child("Users").child("MessProviders").child("locations");
    currentDBcordinates.addValueEventListener(new ValueEventListener() {
    @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            //Create an array of markers
            int size = (int) dataSnapshot.getChildrenCount(); //
            Marker[] allMarkers = new Marker[size];
            mMap.clear();   //Assuming you're using mMap
            for(DataSnapshot ds : dataSnapshot.getChildren()) {
               //Specify your model class here
                CordinatesModel cordinatesModel = new CordinatesModel();
                //lets create a loop
                 for(int i=0;i<=size;i++) {
                    try {
                        //assuming you've set your getters and setters in the Model class
                          cordinatesModel.setmProviderLatitude(s.getValue(CordinatesModel.class).getmProviderLatitude());
                        cordinatesModel.setmProviderLongitude(s.getValue(CordinatesModel.class).getmProviderLongitude());
                        cordinatesModel.setmProviderBrandName(s.getValue(CordinatesModel.class).getmProviderBrandName());
                        //lets retrieve the coordinates and other information
                         Double latitude1 = cordinatesModel.getmProviderLatitude();
                Double longitude1 = cordinatesModel.getmProviderLongitude();
                String brandName=cordinatesModel.getmProviderBrandName();
                        //convert the coordinates to LatLng
                        LatLng latLng = new LatLng(latitude1, longitude1);
                        mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
                        //Now lets add updated markers

                     //lets add updated marker
                        allMarkers[i] = mMap.addMarker(new MarkerOptions()
                        .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)).position(latLng).title(brandName));enter code here
                 }catch (Exception ex){}
                 }


           }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
 }

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