android how to add text and value in spinner

Question

how to add text and value in spinner. And how to get value selected in spinner. (Same as select option in html. eg. <select><option value="1">Volvo</option></select>)

activity_main.xml

<Spinner
      android:id="@+id/spinner"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:prompt="@string/spinner_title"/>

ActivityMain.java

Spinner spinner = (Spinner) findViewById(R.id.spinner);

  List<String> categories = new ArrayList<String>();
  categories.add("Spinner 1");
  categories.add("Spinner 2");
  categories.add("Spinner 3");

  ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);

  dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

  spinner.setAdapter(dataAdapter);