Appliquer dynamiquement un style à un bouton

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="bouton" parent="@android:style/Widget.Button">
        <item name="android:layout_width">wrap_content</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:background">@drawable/bordure_bouton</item>
        <item name="android:textAllCaps">false</item>
        <item name="android:layout_centerInParent">true</item>
        <item name="android:padding">10dp</item>
    </style>
 
    <declare-styleable name="testBouton">
        <attr name="tBouton" format="reference"/>
    </declare-styleable>
 
    <style name="appT">
        <item name="tBouton">@style/bouton</item>
    </style>
</resources>

package fr.test;
 
import android.os.Build;
import android.os.Bundle;
import android.text.Html;
import android.text.Spanned;
import android.widget.Button;
import android.widget.RelativeLayout;
 
import androidx.appcompat.app.AppCompatActivity;
 
public class MainActivity extends AppCompatActivity
{
    private RelativeLayout layoutPrincipal = null;
 
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        layoutPrincipal = findViewById(R.id.layoutPrincipal);
 
        Button bouton2 = new Button(this, null, R.attr.tBouton);
        String textBouton2 = getResources().getString(R.string.cliquezMoi);
        Spanned t = Html.fromHtml(textBouton2);
 
        bouton2.setText(t);
        layoutPrincipal.addView(bouton2);
    }
}