问Android Firebase实时数据库筛选器父级

EN

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
ValueEventListener valueEventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String team1 = ds.child("team1").getValue(String.class);
            String team2 = ds.child("team2").getValue(String.class);
            if(team1.equals("redsox") && team2.equals("yankees")) {
                Log.d("TAG", "Foaund only: team1:redsox and team2:yankees");
            }
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
};
rootRef.addListenerForSingleValueEvent(valueEventListener);