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Create a new menu xml file in the res/menu folder.
Add an item to the menu with the attribute android:id="@+id/textviewmenu_item" and android:title="TextView".
In the Main Activity's onCreateOptionsMenu() method, inflate the menu xml file and return true.
In the Main Activity's onOptionsItemSelected() method, check if the selected menu item is the textviewmenu_item.
If it is, create a new TextView element using the findViewById() method with the id R.id.text_view, and set its text to "Hello World".
Finally, add the TextView element to the Main Activity's layout using the addView() method of the parent container.