How to display the value of a variable on the screen?

Question

I know this is very basic question, but I need to know, how I can display the contents of a variable on the screen.

Do I use a textview in my layout?

I have

Answer 1

In the Activity...

  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    int myValue = deriveMyValue();
    String message =
        myValue == -1 ?
            "The value is invalid." :
            "The value is " + myValue;
    TextView tv = (TextView) findViewById(R.id.my_text_view);
    tv.setText(message);
  }