code:

private ProgressDialog progress;

private void doFirstRun() {
   SharedPreferences settings = getSharedPreferences("PREFS", MODE_PRIVATE);
   if (settings.getBoolean("isFirstRun", true)) {
	progress = ProgressDialog.show(this, "First Run", "Creating player database and adding players").show();
	new AddPlayersTask().execute();
   }
}

private class AddPlayersTask extends AsyncTask<Void, Void, Void> {
	@Override
	protected Void doInBackground(Void... voids) {
		addPlayers();
		SharedPreferences.Editor editor = settings.edit();
       		editor.putBoolean("isFirstRun", false);
       		editor.commit();
		return null;
	}

	@Override
	protected void onPostExecute(Void v) {
		progress.dismiss();
	}
}