FirebaseRecyclerAdapter<messages, chatViewHolder> chats = new FirebaseRecyclerAdapter<messages, chatViewHolder>(
            messages.class,
            R.layout.message_holder,
            chatViewHolder.class,
            rootRef.child(Current_user).orderByChild("num")
    ) {
        @Override
        protected void populateViewHolder(chatViewHolder viewHolder, messages model, int position) {
            viewHolder.setTextMsg(model.getText(), model.getFrom(), Current_user);
            i = model.getNum();
            i++;
        }
    };

public void setTextMsg(String msg, String user, String CurrentUser){
        TextView msgTextViewFrom = (TextView) mView.findViewById(R.id.MessageHolder_chatMessageFrom);
        TextView msgTextViewTo = (TextView)mView.findViewById(R.id.MessageHolder_chatMessageTo);
        if(user.equals(CurrentUser)){
            msgTextViewTo.setVisibility(View.INVISIBLE);
            msgTextViewFrom.setText(msg);
        }else{
            msgTextViewFrom.setVisibility(View.INVISIBLE);
            msgTextViewTo.setText(msg);
        }
    }