[android] Android Dialog: Removing title bar

I'm using next variant:

Activity of my custom Dialog:

public class AlertDialogue extends AppCompatActivity {

    Button btnOk;
    TextView textDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_alert_dialogue);

        textDialog = (TextView)findViewById(R.id.text_dialog) ;
        textDialog.setText("Hello, I'm the dialog text!");

        btnOk = (Button) findViewById(R.id.button_dialog);
        btnOk.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
    }
}

activity_alert_dialogue.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="300dp"
    android:layout_height="wrap_content"
    tools:context=".AlertDialogue">

    <TextView
        android:id="@+id/text_dialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="24dp"
        android:text="Hello, I'm the dialog text!"
        android:textColor="@android:color/darker_gray"
        android:textSize="16dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button_dialog"
        android:layout_width="wrap_content"
        android:layout_height="36dp"
        android:layout_margin="8dp"
        android:background="@android:color/transparent"
        android:text="Ok"
        android:textColor="@android:color/black"
        android:textSize="14dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/text_dialog" />


</android.support.constraint.ConstraintLayout>

Manifest:

<activity android:name=".AlertDialogue"
            android:theme="@style/AlertDialogNoTitle">
</activity>

Style:

<style name="AlertDialogNoTitle" parent="Theme.AppCompat.Light.Dialog">
        <item name="android:windowNoTitle">true</item>
</style>

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