LayoutへのViewの追加

Layoutにtextviewを追加するところがうまくいきません。
データベースにはデータがちゃんと入っていますが、画面に出てきません。
昨日まではできてましたが、、
回答お願いいたします。

@Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                    Message message = snapshot.getValue(Message.class);
                    TextView textView = new TextView(getApplicationContext());
                    textView.setText(message.data.toString() + message.message.toString());
                    textLayout.addView(textView, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT));
                }
            }

package sampleapplication;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
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.Query;
import com.google.firebase.database.ValueEventListener;

import java.util.Calendar;
import java.util.HashMap;
import java.util.Map;


public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private FirebaseDatabase database = FirebaseDatabase.getInstance();
    private LinearLayout textLayout;
    private EditText edit;
    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textLayout = findViewById(R.id.textLayout);
        edit = findViewById(R.id.edit);
        button = findViewById(R.id.button);

        findViewById(R.id.button).setOnClickListener(this);

        setup();
    }

    private void setup(){
        DatabaseReference reference = database.getReference("messages");
        ValueEventListener eventListener = (new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                    Message message = snapshot.getValue(Message.class);
                    TextView textView = new TextView(getApplicationContext());
                    textView.setText(message.data.toString() + message.message.toString());
                    textLayout.addView(textView, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT));
                }
            }

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

    private void add(String msg, String date){
        Message message = new Message();
        message.message = msg;
        message.data = date;
        DatabaseReference reference = database.getReference("messages" + "/" + date);
        reference.setValue(message);
    }

    private String getTime() {

        CharSequence charSequence = android.text.format.DateFormat.format("HH:mm", Calendar.getInstance());
        return charSequence.toString();
    }

    private String getDate() {
        CharSequence charSequence = android.text.format.DateFormat.format("yyyy-MM-dd", Calendar.getInstance());
        return charSequence.toString();
    }

    @Override
    public void onClick(View view){
        int id = view.getId();
        if (R.id.button == id){
            String str = edit.getText().toString();
            add(str, getTime());
            edit.getEditableText().clear();
        }
    }

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="sample.MainActivity"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textLayout">
    </LinearLayout>


    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/edit"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button"/>

</LinearLayout>

public class Message {

    public String message;
    public String data;

    public String getData(){
        return data;
    }

    public void setData(String data) {
        this.data = data;
    }

    public String getMessage(){
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}