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

});
}
}

4) 액티비티 3

package com.example.mysubway;

import androidx.appcompat.app.AppCompatActivity;

import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.recyclerview.widget.RecyclerView;

import android.app.Activity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;

import android.widget.TextView;
import android.widget.Toast;

public class CsActivity extends AppCompatActivity {
Button btn_chat;

Button btn_find;
Button btn_send;

LinearLayout screen1;
RecyclerView screen2;

TextView screen3;

EditText cs_chat;

String chat;

@Override
protected void onCreate(Bundle savedInstanceState) {