Question

我是Android新手并尝试通过制作小代码来练习。我试图在日期上有所不同，并根据它显示文本视图。但是我在Android手机上当天得到了不同的区别。比如当我打开应用程序时，它表示天数差异为5。我关闭它，重新打开它，现在它说diff是4！

在模拟器上它工作正常。我正在使用以下代码。任何人都可以提出一些改进建议吗？

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");

        }

    }
}

Answer 1

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);

...

此外，您应该在某处（Ex.day，month，year等）存储today对象的重要值，同样也应该清除它。之后，你可以把这些值放回去，最后你可以用它来与medStartDate进行比较。它会避免因为时间差异而得到的问题。

Android中的日期差异不正确

1 个答案: