Here you can find the source of convertNotNull(Long long1)
public static String convertNotNull(Long long1)
import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import android.annotation.SuppressLint; public class Main{ private static final String FORMAT_DATE_AND_TIME_YYYY_MM_DD_HH_MM = "yyyy-MM-dd HH:mm"; public static String convertNotNull(String dateString) { if (StringUtils.isEmpty(dateString) || dateString.equals("0")) { return "null"; }/*from ww w . j a v a2 s. c om*/ Date date = parseDate(dateString); if (date == null) { return "null"; } else { return String.valueOf(date.getTime()); } } public static String convertNotNull(Long long1) { String str = String.valueOf(long1); if (StringUtils.isEmpty(str) || long1.equals("0")) { return "null"; } Date date = parseDate(str); if (date == null) { return "null"; } else { return String.valueOf(date.getTime()); } } public static Date parseDate(String dateString) { SimpleDateFormat sdf = new SimpleDateFormat( FORMAT_DATE_AND_TIME_YYYY_MM_DD_HH_MM); try { return sdf.parse(dateString); } catch (Exception e) { e.printStackTrace(); return null; } } }