Retrieve location from Firebase and put marker on google map api for android

Question

I am trying to create app to store location on firebase when save button is pressed and retrieve locations from firebase and display all pins in the map. I have been able to

Answer 1

First : you nedd to change the structure to be like this :

 Data
  Location
    -Kidp45TdInOM3Bsyu2b
       latitude:19.772613777905196 
       longitude:-9.92741011083126
    -KidsmTExZY2KjnS7S-b
       latitude: 18.221073689785065
       longitude: -6.573890447616577
    -KidvmAgV0bm2uT_Pcdr
       latitude: 14.44608051870992
       longitude: -6.510856859385967

The way to do that is :

        mSaveButton.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view){
                //change to refDatabase or mDatabase.child("Location")
                DatabaseReference newPost = refDatabase.push();
                //the push() command is already creating unique key
                newPost.setValue(latlng);

            }
        });

And the code for put marker to the map from your refDatabase is :

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

   ...

   refDatabase.addChildEventListener(new ChildEventListener() {
     @Override
     public void onChildAdded(DataSnapshot dataSnapshot, String prevChildKey) {
          LatLng newLocation = new LatLng(
                        dataSnapshot.child("latitude").getValue(Long.class),
                        dataSnapshot.child("longitude").getValue(Long.class)
                    );
          mMap.addMarker(new MarkerOptions()
              .position(newLocation)
              .title(dataSnapshot.getKey()));
     }

     @Override
     public void onChildChanged(DataSnapshot dataSnapshot, String prevChildKey) {}

     @Override
     public void onChildRemoved(DataSnapshot dataSnapshot) {}

     @Override
     public void onChildMoved(DataSnapshot dataSnapshot, String prevChildKey) {}

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