app/src/main/java/pt/epvc/teste1/MainActivity.java

@@ -20,6 +20,5 @@ public class MainActivity extends AppCompatActivity {
             v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
             return insets;
         });
-        //adicionei código aqui
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -16,12 +16,4 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
-    <Button
-        android:id="@+id/button"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Button"
-        tools:layout_editor_absoluteX="159dp"
-        tools:layout_editor_absoluteY="341dp" />
-
 </androidx.constraintlayout.widget.ConstraintLayout>