Page 448 - MDP2020-1

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public void btn_check_clicked(View v){
screen1.setVisibility(View.INVISIBLE);
screen2.setVisibility(View.INVISIBLE);
screen3.setVisibility(View.VISIBLE);

}
}

5) 액티비티 4

package com.example.mysubway;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;

import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

public class DataActivity extends AppCompatActivity {
TextView textview;
TextView textview3;

// 파이어베이스와 안드로이드 스튜디오 연동

FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myref = database.getReference("reference");

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

setContentView(R.layout.activity_data);

textview = (TextView)findViewById(R.id.run);
textview3 = (TextView)findViewById(R.id.wait);

myref.addValueEventListener( new ValueEventListener() {
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {