Android buttona tıklanma.. Önce xml sayfasına giderek button oluşturulur.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".Aktivity.GostermeActivity">

        <com.google.android.material.button.MaterialButton
            android:id="@+id/ayarla"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:layout_margin="5dp"
            android:fontFamily="@font/abril_fatface"
            style="@style/Widget.MaterialComponents.TimePicker.ImageButton"
            android:text="ayarla"
            android:textAllCaps="true"
            android:textStyle="bold" />

</RelativeLayout>

Sonra id ile clasa bağlanır..

 
public class GostermeActivity extends AppCompatActivity {
  
    Button ayarla;

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

   
        ayarla = findViewById(R.id.ayarla);

        ayarla.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Toast.makeText(this, "Butona tıklandı ", Toast.LENGTH_LONG).show();
             
            }
        });
 
    }
}