如何在Android的datepicker对话框中显示所选日期的第二天的日期？

Question

我目前在页面加载时显示今天的日期和日期以及明天的日期和日期。但我的要求是

1）无论我从Datepicker,选择的日期，它应该显示在第一个布局上

2）第二天的日期应显示在第二个布局上。

我的第一个要求是没有任何问题。但是，无论我选择哪一天，它都显示在第一个布局上。没问题，但我的第二个要求有问题。

考虑一下我是否按照预期在第一个布局上显示的DatePicker,上选择了2018年5月25日，但不是在2018年5月26日显示第二天的日期，而是显示为2018年6月26日。但我需要它以这样的方式工作：如果我在Datepicker,中选择2018年5月25日，则所选日期应显示在第一个布局上，并且紧接着的第二天日期（20-May-2018）应显示在下一个布局上。这应该适用于我在Datepicker.中选择的任何日期

我哪里出错了？

这是我的Activity.Java：

public class PrivacyPolicyActivity extends AppCompatActivity {

    LinearLayout layout1, layout2, layout3, todayLayout, tomorrowLayout;
    ImageView calendarImgView;
    TextView todayDate;
    TextView todayDay;
    TextView tommmorrowDate;
    TextView tommorrowDay;
    TextView todayLabel;
    TextView tommorrowlabel;
    DatePickerDialog datePickerDialog;
    Calendar calendar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_privacy_policy);

        calendar = Calendar.getInstance();
        Date today = calendar.getTime();
        calendar.add(Calendar.DAY_OF_YEAR, 1);
        Date tomorrow = calendar.getTime();

        final DateFormat dateFormat = new SimpleDateFormat("dd-MMM");

        DateFormat day = new SimpleDateFormat("EEEE");

        layout1 = (LinearLayout) findViewById(R.id.layout1);
        layout2 = (LinearLayout) findViewById(R.id.layout2);
        layout3 = (LinearLayout) findViewById(R.id.layout3);
        todayDate = (TextView) findViewById(R.id.todayDate);

        todayDate.setText(dateFormat.format(today));
        todayDay = (TextView) findViewById(R.id.todayDay);
        todayDay.setText(day.format(today));

        tommmorrowDate = (TextView) findViewById(R.id.tommmorrowDate);
        tommmorrowDate.setText(dateFormat.format(tomorrow));
        tommorrowDay = (TextView) findViewById(R.id.tommorrowDay);
        tommorrowDay.setText(day.format(tomorrow));

        todayLayout = (LinearLayout) findViewById(R.id.todayLayout);
        tomorrowLayout = (LinearLayout) findViewById(R.id.tomorrowLayout);

        todayLabel = (TextView) findViewById(R.id.todayLabel);
        tommorrowlabel = (TextView) findViewById(R.id.tommorrowlabel);
        calendarImgView = (ImageView) findViewById(R.id.calendarImgView);

        calendarImgView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Calendar calendar = Calendar.getInstance();
                int year = calendar.get(Calendar.YEAR);
                int month = calendar.get(Calendar.MONTH);
                int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);

                datePickerDialog = new DatePickerDialog(PrivacyPolicyActivity.this,
                        new DatePickerDialog.OnDateSetListener() {
                            @Override
                            public void onDateSet(DatePicker datePicker, int year, int month, int day) {

//                                SimpleDateFormat dateandmonth = new SimpleDateFormat("dd-MMM");
//                                Date date = new Date();
//                                String reqddate = dateandmonth.format(date);
                                //todayDate.setText(day + "/" + (month + 1) + "/" + year);

                                int cyear = datePicker.getYear();
                                int cmonth = datePicker.getMonth();
                                int cday = datePicker.getDayOfMonth();

                                Calendar cld = Calendar.getInstance();
                                cld.set(cyear, cmonth, cday);
                                SimpleDateFormat format = new SimpleDateFormat("dd-MMM");
                                String strDate = format.format(cld.getTime());
                                todayDate.setText(strDate);

                                SimpleDateFormat dayfmt = new SimpleDateFormat("EEEE");
                                String dayselected = dayfmt.format(cld.getTime());
                                todayDay.setText(dayselected);

                                int nextYear = datePicker.getYear() + 1;
                                int nextMonth = datePicker.getMonth() + 1;
                                int nextDay = datePicker.getDayOfMonth() + 1;

                                Calendar nextcld = Calendar.getInstance();
                                nextcld.set(nextYear, nextMonth, nextDay);

                                SimpleDateFormat tom_format = new SimpleDateFormat("dd-MMM");
                                String tom_date = tom_format.format(nextcld.getTime());
                                tommmorrowDate.setText(tom_date);

                                SimpleDateFormat day_fmt = new SimpleDateFormat("EEEE");
                                String tom_day = day_fmt.format(cld.getTime());
                                tommorrowDay.setText(tom_day);
                            }
                        }, year, month, dayOfMonth);

                datePickerDialog.show();
            }

        });
    }
}

Answer 1

你为什么用1增加月份和年份？

int nextYear = datePicker.getYear() + 1;
int nextMonth = datePicker.getMonth() + 1;
int nextDay = datePicker.getDayOfMonth() + 1;

只需增加nextDay。

cld.add(Calendar.DATE, 1);

解

 calendarImgView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Calendar calendar = Calendar.getInstance();
                int year = calendar.get(Calendar.YEAR);
                int month = calendar.get(Calendar.MONTH);
                int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);

                datePickerDialog = new DatePickerDialog(PrivacyPolicyActivity.this,
                        new DatePickerDialog.OnDateSetListener() {
                            @Override
                            public void onDateSet(DatePicker datePicker, int year, int month, int day) {


//                                SimpleDateFormat dateandmonth = new SimpleDateFormat("dd-MMM");


                                int cyear = datePicker.getYear();
                                int cmonth =datePicker .getMonth();
                                int cday = datePicker.getDayOfMonth();

                                Calendar cld  = Calendar.getInstance();
                                cld.set(cyear, cmonth, cday);
                                SimpleDateFormat format = new SimpleDateFormat("dd-MMM");
                                String strDate = format.format(cld.getTime());
                                todayDate.setText(strDate);

                                SimpleDateFormat dayfmt = new SimpleDateFormat("EEEE");
                                String dayselected = dayfmt.format(cld.getTime());
                                todayDay.setText(dayselected);


                                cld.add(Calendar.DATE, 1);

                                SimpleDateFormat day_fmt = new SimpleDateFormat("EEEE");
                                String tom_day = day_fmt.format(cld.getTime());
                                tommorrowDay.setText(tom_day);


                            }
                        },year,month,dayOfMonth);

                datePickerDialog.show();
            }





        });

Answer 2

在你的Datepicker回调中，下面的代码显示第二天。

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.DATE, datePicker.getDayOfMonth());
calendar.set(Calendar.MONTH, datePicker.getMonth());
calendar.set(Calendar.YEAR, datePicker.getYear());

calendar.add(Calendar.DATE, 1);

SimpleDateFormat tom_format = new SimpleDateFormat("dd-MMM");
String tom_date = tom_format.format(calendar);
tommmorrowDate.setText(tom_date);