如何在“之前/之后”获得“时差”？ 这可能不使用任何库吗？

我想将当前日期（YYYY-MM-DD）和时间（SS：MM：HH）的格式更改为’n’个月前，’n’天前，’n’小时“以前”格式。

当前格式：

要求的格式：

我使用Bean和Adapter类来获取当前日期。 代码如下;

适配器类 ：

public class MessageAdapter extends BaseAdapter { private Activity activity; private List messageBeanList; public ImageLoader imageLoader; private Context context; public MessageAdapter (Activity activity,List messageBeanList) { super(); this.activity = activity; // this.context = context; this.messageBeanList = messageBeanList; this.context=context; } @Override public int getCount() { return messageBeanList.size(); } @Override public Object getItem(int position) { return messageBeanList.get(position); } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { ItemHolder itemHolder = new ItemHolder(); if (convertView == null) { LayoutInflater vi = (LayoutInflater) activity.getSystemService( Context.LAYOUT_INFLATER_SERVICE); convertView = vi.inflate( R.layout.message_item, null); imageLoader=new ImageLoader(activity.getApplicationContext()); itemHolder.timestampp = (TextView) convertView .findViewById(R.id.timestamp); convertView.setTag(itemHolder); } else { itemHolder = (ItemHolder) convertView.getTag(); } class ItemHolder { public TextView timestampp; } @Override public void notifyDataSetChanged() { super.notifyDataSetChanged(); // Your code to nofify } } 

豆类：

  import com.google.gson.annotations.SerializedName; public class MessageBean { @SerializedName("date_created") private String dateCreated = ""; } public String getDateCreated() { return dateCreated; } public void setDateCreated(String dateCreated) { this.dateCreated = dateCreated; } 

在SOF中几乎遇到了所有相关问题，但由于我使用的是bean和适配器类，所以没有得到我想要的东西。 如果使用JSON解析，这可以转换日期和时间格式吗？

Answer 1

我希望这对你有用.. 只需在适配器中添加代码即可

  /***************get current date time function*************/ String curDateTime = ""; Calendar c = Calendar.getInstance(); SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try{ String curDateTime = df.format(c.getTime()); }catch(Exception e){} /***************get current date time function*************/ // add simple_date_format for uniqueness SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { Date date1 = simpleDateFormat.parse(messageBean.getDateCreated()); // like 2016-03-09 07:08:27 Date date2 = simpleDateFormat.parse(curDateTime); // 2016-03-09 07:08:27 differentDateTime = printDifference(date1, date2); } catch (Exception e) { e.printStackTrace(); } itemHolder.timestampp.setText(differentDateTime); /************function of print different for showing date into ago format***************/ //1 minute = 60 seconds //1 hour = 60 x 60 = 3600 //1 day = 3600 x 24 = 86400 public String printDifference(Date startDate, Date endDate){ String allDaysMonsSeconds=""; //milliseconds long different = endDate.getTime() - startDate.getTime(); Log.d("TAG","startDate : " + startDate); Log.d("TAG","endDate : "+ endDate); Log.d("TAG","different : " + different); long secondsInMilli = 1000; long minutesInMilli = secondsInMilli * 60; long hoursInMilli = minutesInMilli * 60; long daysInMilli = hoursInMilli * 24; long yearInMilli = daysInMilli * 365; long elapsedDays = different / daysInMilli; different = different % daysInMilli; long elapsedHours = different / hoursInMilli; different = different % hoursInMilli; long elapsedMinutes = different / minutesInMilli; different = different % minutesInMilli; long elapsedSeconds = different / secondsInMilli; long elapsedYears = different / yearInMilli; Log.d("TAG","%d days, %d hours, %d minutes, %d seconds %n, %d years:"+elapsedDays+","+elapsedHours+","+elapsedMinutes+","+elapsedSeconds+","+elapsedYears); // code for showing before days... if(elapsedDays<=0){ if (elapsedHours<=0) { if (elapsedMinutes<=0) { allDaysMonsSeconds = elapsedSeconds+" second ago"; } else { allDaysMonsSeconds = elapsedMinutes+" minute ago"; } } else { allDaysMonsSeconds = elapsedHours+" hour ago"; } } else{ allDaysMonsSeconds = elapsedDays+" day ago"; } return allDaysMonsSeconds; } /************function of print different for showing date into ago format***************/ 

Answer 2

尝试这个，

首先初始化您的textview。

 TextView t = new TextView(); 

调用以下方法，

 getTimeDifference(date, t); private void getTimeDifference(String pDate, TextView time) { int diffInDays = 0; SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); format.setTimeZone(TimeZone.getTimeZone("GMT")); Calendar c = Calendar.getInstance(); String formattedDate = format.format(c.getTime()); Date d1 = null; Date d2 = null; try { d1 = format.parse(formattedDate); d2 = format.parse(pDate); long diff = d1.getTime() - d2.getTime(); diffInDays = (int) (diff / (1000 * 60 * 60 * 24)); if (diffInDays > 0) { if (diffInDays == 1) { time.setText(diffInDays + " day ago"); } else { time.setText(diffInDays + " days ago"); } } else { int diffHours = (int) (diff / (60 * 60 * 1000)); if (diffHours > 0) { if (diffHours == 1) { time.setText(diffHours + " hr ago"); } else { time.setText(diffHours + " hrs ago"); } } else { int diffMinutes = (int) ((diff / (60 * 1000) % 60)); if (diffMinutes == 1) { time.setText(diffMinutes + " min ago"); } else { time.setText(diffMinutes + " mins ago"); } } } } catch (ParseException e) { // System.out.println("Err: " + e); e.printStackTrace(); } } 

Answer 3

使用以下代码，并在ago将其连接为字符串：

  startTime = "2016-03-09 16:23:30"; StringTokenizer tk = new StringTokenizer(startTime); String date = tk.nextToken(); String time = tk.nextToken(); SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss"); SimpleDateFormat sdfs = new SimpleDateFormat("hh:mm a"); Date dt; try { dt = sdf.parse(time); System.out.println("Time Display: " + sdfs.format(dt)+" ago"); // <-- I got result here } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } 

Answer 4

  String curDateTime = ""; Calendar c = Calendar.getInstance(); SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try{ String curDateTime = df.format(c.getTime()); }catch(Exception e){} /***************get current date time function*************/ // add simple_date_format for uniqueness SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { Date date1 = simpleDateFormat.parse(messageBean.getDateCreated()); // like 2016-03-09 07:08:27 Date date2 = simpleDateFormat.parse(curDateTime); // 2016-03-09 07:08:27 differentDateTime = printDifference(date1, date2); } catch (Exception e) { e.printStackTrace(); } itemHolder.timestampp.setText(differentDateTime); /************function of print different for showing date into ago format***************/ //1 minute = 60 seconds //1 hour = 60 x 60 = 3600 //1 day = 3600 x 24 = 86400 public String printDifference(Date startDate, Date endDate){ String allDaysMonsSeconds=""; //milliseconds long different = endDate.getTime() - startDate.getTime(); Log.d("TAG","startDate : " + startDate); Log.d("TAG","endDate : "+ endDate); Log.d("TAG","different : " + different); long secondsInMilli = 1000; long minutesInMilli = secondsInMilli * 60; long hoursInMilli = minutesInMilli * 60; long daysInMilli = hoursInMilli * 24; long yearInMilli = daysInMilli * 365; long elapsedDays = different / daysInMilli; different = different % daysInMilli; long elapsedHours = different / hoursInMilli; different = different % hoursInMilli; long elapsedMinutes = different / minutesInMilli; different = different % minutesInMilli; long elapsedSeconds = different / secondsInMilli; long elapsedYears = different / yearInMilli; Log.d("TAG","%d days, %d hours, %d minutes, %d seconds %n, %d years:"+elapsedDays+","+elapsedHours+","+elapsedMinutes+","+elapsedSeconds+","+elapsedYears); // code for showing before days... if(elapsedDays<=0){ if (elapsedHours<=0) { if (elapsedMinutes<=0) { allDaysMonsSeconds = elapsedSeconds+" second ago"; } else { allDaysMonsSeconds = elapsedMinutes+" minute ago"; } } else { allDaysMonsSeconds = elapsedHours+" hour ago"; } } else{ allDaysMonsSeconds = elapsedDays+" day ago"; } return allDaysMonsSeconds; }