UpdateSpinnerDynamically.java

    Spinner spinner = (Spinner)findViewById(R.id.mySpinner);
    List<String> list = Arrays.asList(getResources().getStringArray(R.array.state));

    ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list);
    spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(spinnerAdapter);
    spinnerAdapter.add("DELHI");
    spinnerAdapter.notifyDataSetChanged();