функции кнопок

app/src/main/res/layout/activity_proekt2.xml

@@ -5,5 +5,11 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".proekt2">
-
+<TextView
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:textSize="40dp"
+    app:layout_constraintEnd_toEndOf="parent"
+    app:layout_constraintBottom_toTopOf="parent"
+    app:layout_constraintStart_toStartOf="parent"/>
 </androidx.constraintlayout.widget.ConstraintLayout>