在尝试从Firebase数据库中读取数据后，我尝试根据新查询中的数据刷新RecyclerView。首次打开应用程序时，recyclelerview会根据初始查询填充项目，并且应该在之后立即刷新新查询。但是，在显示第一个查询的数据后，数据不会刷新.Am我做错了什么？请帮忙
users2 = (RecyclerView) findViewById(R.id.users_list);
users2.setHasFixedSize(false);
users2.setLayoutManager(new LinearLayoutManager(this));
query = databaseReference;
final FirebaseRecyclerAdapter<User, UserViewholder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<User, UserViewholder>(
User.class, R.layout.users_row, UserViewholder.class, query) {
@Override
protected void populateViewHolder(UserViewholder viewHolder, User model, int position) {
viewHolder.setUsername(model.getUsername());
viewHolder.setLevels(model.getLevels());
viewHolder.setDownloadUrl(getApplicationContext(), model.getDownloadUrl());
}
};
users2.setAdapter(firebaseRecyclerAdapter);
final String user_id = firebaseAuth.getCurrentUser().getUid();
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot){
halls2 = (String) dataSnapshot.child("Male").child(user_id).child("halls").getValue();
halls1 = (String) dataSnapshot.child("Female").child(user_id).child("halls").getValue();
}
@Override
public void onCancelled(DatabaseError databaseError){
}
});
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot){
if(dataSnapshot.child("Male").hasChild(user_id)){
query = databaseReference.child("Female").orderByChild("halls").equalTo(halls2);
}
else{
query = databaseReference.child("Male").orderByChild("halls").equalTo(halls1);
}
firebaseRecyclerAdapter.notifyDataSetChanged();
}
@Override
public void onCancelled(DatabaseError databaseError){
}
});