从Firebase实时数据库中检索数据

Question

我想从android列表视图中的firebase实时数据库中检索这些数据。

@Override
protected void onStart() {
    super.onStart();
    //attaching value event listener
    contactsRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {




            //clearing the previous artist list
            videoses.clear();

            //iterating through all the nodes
            for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                //getting artist
                Videos artist = postSnapshot.getValue(Videos.class);
                //adding artist to the list
                videoses.add(artist);
            }

            //creating adapter
            ArtistList artistAdapter = new ArtistList(MainActivity.this, videoses);
            //attaching adapter to the listview
            listViewArtists.setAdapter(artistAdapter);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

无法检索视频列表的子数据即。视频1，下载并命名。