android - 如何防止用户设置早于当前日期和时间的日期和时间

Question

我的应用程序遇到问题。我正在尝试做一些事情来阻止用户选择已经过去的日期和时间。如果用户选择过去的日期和时间，将显示错误消息。用户将从 datePicker 和 timePicker 中选择日期和时间。有人对这样做有任何想法吗？任何帮助将不胜感激。非常感谢！

Answer 1

您可以通过广播接收器 ACTION_TIME_CHANGED 阻止用户更改日期时间。如果用户更改日期时间，则会调用广播接收器。覆盖广播接收器中的 onRecieve 方法。请确保在清单文件中定义广播接收器

  @Override
  public void onReceive(Context context, Intent intent) {

    // You can put conditions the changed date time is not past from the current time and show toast message.

  }

Answer 2

如果您在 edittext 中设置选择器值，您可以这样做：

Calendar cal = Calendar.getInstance();
                                cal.set(cal.get(Calendar.YEAR),
                                        cal.get(Calendar.MONTH),
                                        cal.get(Calendar.DAY_OF_MONTH));
                                DateFormat df = new SimpleDateFormat(
                                        "dd/MM/yyyy");
                                Date day_entered, day_valid;

                                day_entered = df.parse(your_date_edittext.getText()
                                        .toString());
                                day_valid = df.parse(df.format(cal.getTime()));
                                if (day_entered.after(day_valid)) {
                                    Toast msg = Toast
                                            .makeText(
                                                    Profile.this,
                                                    "Please Enter a valid date",
                                                    Toast.LENGTH_LONG);
                                    msg.show();
                                    }

Answer 3

if(fromdate!=null && fromdate.length()>0 && todate!=null && todate.length()>0)
   {
    try
       {
      sdf = new SimpleDateFormat("yyyy-mm-dd");
               date1 = sdf.parse(fromdate);
               date2 = sdf.parse(todate);

           Calendar cal = Calendar.getInstance();
           Calendar cal2 = Calendar.getInstance();


           cal.setTime(date1);
                 cal2.setTime(date2);


                  if(cal.after(cal2)){
                System.out.println("Date1 is after Date2");
              //  Toast.makeText(getApplicationContext(), "from Date1 is after Date2", Toast.LENGTH_SHORT).show();
               // clear the dates here........
                  }


       }
      catch(Exception e)
      {
       Log.d("pavan","in exception block ");
      }

}