Android : How to run code only first lunch of the day

private static final String PREFS_NAME = null;

// Try to run only first lunch of the day
SharedPreferences sharedPref = getSharedPreferences(PREFS_NAME, 0);
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
String currentDate = sdf.format(new Date());

if (!sharedPref.getString("LAST_LAUNCH_DATE","nodate")
.contains(currentDate))

{
    // Date not matches. User has already Launched the app once today.

    ... Run Anything you want for first lunch ...


    // set Last Lunch date
    SharedPreferences.Editor editor = sharedPref.edit();
    editor.putString("LAST_LAUNCH_DATE", currentDate);
    editor.commit();
}