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String run = dataSnapshot.child("run").getValue(String.class);
String wait = dataSnapshot.child("wait").getValue(String.class);

// 데이터베이스 값을 해당 변수에 저장해서 출력

textview.setText("1호선은 " + run + "대 운행중입니다.");
textview3.setText(wait + "대가 대기중입니다.");
}
public void onCancelled(@NonNull DatabaseError databaseError) {

}
});
}
}

6) 액티비티 5

package com.example.mysubway;

import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;

import android.content.Intent;
import android.os.Bundle;

import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class ManageActivity extends AppCompatActivity {

ConstraintLayout screen1;
LinearLayout screen2;

TextView textview_get_cschat;

String get;
String answer;
@Override

protected void onCreate(Bundle savedInstanceState) {
super.onCreate( savedInstanceState );