Android中的日期差异

我是Android新手，尝试通过制作小代码来练习。我想在日期中获得差异并基于它显示文本视图。但我在Android手机当天获得了不同的区别。就像当我打开应用程序，它说在天差异是5. 我关闭它，重新打开它，现在它说diff是4！Android中的日期差异

在模拟器上它工作正常。我正在使用以下代码。任何人都可以建议一些改进？

package com.practice.tablet; 



import java.util.Calendar; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.TextView; 

public class TabletsSchedule extends Activity { 
    public TextView tvToday; 
    public TextView tvMedStartDate; 
     public TextView tvMessage; 
    public TextView tvDiffInDays; 
    public static final String LOGGER = "ADITYA"; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     tvToday=(TextView)findViewById(R.id.TextView01); 
     tvMedStartDate=(TextView)findViewById(R.id.TextView001); 
     tvMessage=(TextView)findViewById(R.id.TextView05); 
     tvDiffInDays=(TextView)findViewById(R.id.TextView06); 

     String[] months = {"January", "February", 
       "March", "April", "May", "June", "July", 
       "August", "September", "October", "November", "December"}; 

     Calendar today = Calendar.getInstance(); 

     int day= today.get(Calendar.DAY_OF_MONTH); 
     int month=today.get(Calendar.MONTH); 
     int year=today.get(Calendar.YEAR); 

     String strMonth = months[month]; 
     Log.d(LOGGER, "displaying today"); 

     tvToday.setText("Today is "+day+" "+strMonth+" "+year); 

     Calendar medStartDate = Calendar.getInstance(); 
    //DOB.set(year, monthOfYear+1, dayOfMonth); 

     medStartDate.set(Calendar.DAY_OF_MONTH, 27); 
     medStartDate.set(Calendar.MONTH,10); 
     medStartDate.set(Calendar.YEAR,2011); 

     int day1= medStartDate.get(Calendar.DAY_OF_MONTH); 
     int month1=medStartDate.get(Calendar.MONTH); 
     int year1=medStartDate.get(Calendar.YEAR); 

     String strMonth1 = months[month1]; 
     //String med = medStartDate.toString().toString(); 

     tvMedStartDate.setText("Medicine Start Date is "+day1+" "+strMonth1+" "+year1); 

     long diff = today.getTimeInMillis() - medStartDate.getTimeInMillis(); 

     long days = diff/(24 * 60 * 60 * 1000); 

     tvDiffInDays.setText("Difference in days is "+days); 
     Log.d(LOGGER, "days is "+days); 

     if (days%2!=0){ 

         tvMessage.setText("Today you have to take two tablets"); 

     } 
     if (days%2==0){ 

         tvMessage.setText("Today you have to take one tablet"); 

     } 

    } 
}

来源

2011-12-02 user1073326

使用此：

... 
Calendar medStartDate = Calendar.getInstance(); 

medStartDate.clear(); 

medStartDate.set(Calendar.DAY_OF_MONTH, 27); 
medStartDate.set(Calendar.MONTH,10); 
medStartDate.set(Calendar.YEAR,2011); 

...

你也应该存储的地方today对象的重要价值（Ex.day，月，年等），也同样应该清除它。之后，你可以把这些数值放回去，最后你可以用它来比较medStartDate，它可以避免你因为时间微小的不同而出现的问题。

来源

2011-12-02 13:13:08 Hiral

谢谢Hiral！我修改了代码以清除医生开始日期，现在看来按预期工作。我很惊讶它的表现如何怪异！但现在一切都OK :) – user1073326

这是因为它也计入微小的时间差异成其长时间的毫秒值。在设置所需的值之前清除这两个日历对象并对它们进行比较，会将默认值设置为它们两者，使得两者初始相似。因此，在为它们设置特定值后，它们将实际比较它们。 – Hiral

@手记plz帮我找出两个日期之间的差异我计算，但显示一些变化的实际天.... plz ... –

Android中的日期差异

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