Dúvida no Ex. 6 da Aula 3 - Utilizandos menus

Boa noite,

Os formulário do meu projeto não estão apresentando a barra de título, com isso, o menu também não está aparecendo. Alguém saberia dizer qual o problema? Seguem, abaixo, os arquivos do projeto envolvidos no exercício:

<!-- AndroidManifest.xml -->
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="br.com.alura.agenda">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity
            android:name=".ListaAlunosActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
         </activity>
        <activity
            android:name=".FormularioActivity"
            android:label="@string/title_activity_formulario"
            android:theme="@style/AppTheme.NoActionBar">
        </activity>

    </application>

</manifest>

//FormularioActivity
package br.com.alura.agenda;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class FormularioActivity extends AppCompatActivity {

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

        Button btnSalvar = (Button) findViewById(R.id.formulario_salvar);

        btnSalvar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast toast = Toast.makeText(FormularioActivity.this, "Alunos salvo com sucesso!", Toast.LENGTH_SHORT);
                toast.show();
                finish();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_formulario, menu);
        return true;
     }
}

<!-- activity_formulario.xml -->
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".FormularioActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <EditText
            android:id="@+id/formulario_nome"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Nome"/>

        <EditText
            android:id="@+id/formulario_endereco"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Endereço"/>

        <EditText
            android:id="@+id/formulario_telefone"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Telefone"/>

        <EditText
            android:id="@+id/formulario_site"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Site"/>

        <RatingBar
            android:id="@+id/formulario_nota"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:numStars="5"
            android:max="10"
            android:layout_gravity="center"/>

        <Button
            android:id="@+id/formulario_salvar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Salvar" />

    </LinearLayout>
</ScrollView>

<!-- menu_formulario.xml -->
<menu 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"
    tools:context="br.com.alura.agenda.FormularioActivity">

    <item android:id="@+id/menu_formulario_ok"
        android:title="Ok"
        android:icon="@drawable/ic_confirmar"
        app:showAsAction="always"/>

</menu>

Inicialmente havia um arquivo context_formulario.xml que eu deletei e passei a usar somente o activity_formulario.xml.