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setContentView( R.layout.activity_manage);

screen1=findViewById(R.id.register);
screen2=findViewById(R.id.ask_check);

textview_get_cschat=findViewById(R.id.textView_get_cschat);

screen1.setVisibility(View.VISIBLE);

screen2.setVisibility(View.INVISIBLE);

textview_get_cschat.setText(get);
}

public void getText(String s) {

get = s;
}

public void btn_find_clicked(View view){

screen1.setVisibility(View.INVISIBLE);
screen2.setVisibility(View.VISIBLE);
}
}

7) 액티비티 6

package com.example.mysubway;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
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 PositionActivity extends AppCompatActivity {