英文:
How to load array of dates from a given range?
问题
我正在寻找在我的RecyclerView中填充日期范围的最佳方法。为了阐明,我想要从当前日期到接下来的七天内获取所有日期,就像今天是29-07-2020,我想要列出从29-07-2020到04-07-2020的所有日期。现在在我的RecyclerView中,我想要获取每天的日期和月份名称。我尝试了下面的代码,它列出了我想要的日期,但我不确定如何单独获取每天的日期和月份。
List<String> dateList = new ArrayList<String>();
Calendar calendar = Calendar.getInstance();
for (int i=0; i<7; i++) { // Change 31 to 7 to get dates for the next 7 days.
SimpleDateFormat dayDateFormat = new SimpleDateFormat("dd");
SimpleDateFormat monthDateFormat = new SimpleDateFormat("MMMM");
dateList.add(dayDateFormat.format(calendar.getTime()) + " " + monthDateFormat.format(calendar.getTime()));
calendar.add(Calendar.DATE, 1);
Log.i("Date" + i , dateList.get(i));
}
请注意,我已将代码中的循环次数从31更改为7,以获取接下来的7天日期。这段代码将每天的日期和月份名称添加到dateList
中。
英文:
I'm looking for the best way to populate a range of dates in my recyclerview. To elucidate, I want to fetch the all the dates from the current date to next seven days like if today is 29-07-2020 I want to list all dates from 29-07-2020 to 04-07-2020. Now in my recycler I want to get the day date and month name. I tried the below code and it list the dates as i wish but I'm unsure how to get the day date and month individually.
List<String> dateList = new ArrayList<String>();
Calendar calendar = Calendar.getInstance();
for (int i=0; i<31; i++) {
calendar.add(Calendar.DATE, 1);
SimpleDateFormat curFormater = new SimpleDateFormat("EEEE, MMMM dd, yyyy");
dateList.add(curFormater.format(calendar.getTime()));
Log.i("Date" + i , dateList.get(i));
}
答案1
得分: 0
你可以考虑使用https://developer.android.com/reference/java/util/Calendar#get(int)来获取月份,像这样:
calendar.get(Calendar.MONTH)
或者获取月份的日期,像这样:
calendar.get(Calendar.DAY_OF_MONTH)
英文:
You should probably consider https://developer.android.com/reference/java/util/Calendar#get(int) and get month like this:
calendar.get(Calendar.MONTH)
or day of the month like this:
calendar.get(Calendar.DAY_OF_MONTH)
答案2
得分: 0
更改传递给SimpleDateFormat
的字符串以编辑日期格式。
仅显示日期和月份,您可以尝试:
SimpleDateFormat curFormater = new SimpleDateFormat("dd MMMM");
有关日期格式的更多信息在此处。
英文:
Edit the format of the date by changing the String you're passing to SimpleDateFormat
.
For displaying only date and month you can try :
SimpleDateFormat curFormater = new SimpleDateFormat("dd MMMM");
More on formatting date here
答案3
得分: 0
我建议您切换到现代日期时间 API,而不是使用过时的传统日期时间 API。
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
LocalDate today = LocalDate.now();// 同样等同于 LocalDate.now(ZoneId.systemDefault());
// 我建议您使用以下变体并应用所需的时区
// LocalDate today=LocalDate.now(ZoneId.of("Etc/UTC"));
List<String> dateList = new ArrayList<String>();
// 定义日期格式
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("EEEE, MMMM");
// 迭代 7 次,从今天开始,每次迭代后日期增加 1 天
for (LocalDate date = today; date.isBefore(today.plusDays(7)); date = date.plusDays(1)) {
dateList.add(date.format(formatter));
}
// 显示 dateList 的内容
dateList.forEach(System.out::println);
}
}
输出结果:
Monday, August
Tuesday, August
Wednesday, August
Thursday, August
Friday, August
Saturday, August
Sunday, August
如果您的 Android 版本尚不兼容 Java 8,您可以使用ThreeTen-Backport进行回溯。您可能还需要帮助来设置它。
然而,如果您希望继续使用传统的日期时间 API,可以按照以下方式进行:
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
public class Main {
public static void main(String[] args) {
Calendar calendar = Calendar.getInstance();
List<String> dateList = new ArrayList<>();
// 仅定义日期名和月份名的格式
SimpleDateFormat curFormater = new SimpleDateFormat("EEEE, MMMM");
// 迭代 7 次,从今天开始,每次迭代后日期增加 1 天
for (int i = 1; i <= 7; i++) {
dateList.add(curFormater.format(calendar.getTime()));
calendar.add(Calendar.DATE, 1);
}
// 显示 dateList 的内容
dateList.forEach(System.out::println);
}
}
输出结果:
Monday, August
Tuesday, August
Wednesday, August
Thursday, August
Friday, August
Saturday, August
Sunday, August
英文:
I recommend you switch from the outdated legacy date-time API to the modern date-time API.
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
LocalDate today = LocalDate.now();// Same as LocalDate.now(ZoneId.systemDefault());
// I suggest you use the following variant and apply the required time-zone
// LocalDate today=LocalDate.now(ZoneId.of("Etc/UTC"));
List<String> dateList = new ArrayList<String>();
// Define the format
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("EEEE, MMMM");
// Iterate 7-times starting today with date incrementing by 1 after each iteration
for (LocalDate date = today; date.isBefore(today.plusDays(7)); date = date.plusDays(1)) {
dateList.add(date.format(formatter));
}
// Display the content of dateList
dateList.forEach(System.out::println);
}
}
Output:
Monday, August
Tuesday, August
Wednesday, August
Thursday, August
Friday, August
Saturday, August
Sunday, August
If the version of your Android is not compatible with Java-8 yet, you can backport using ThreeTen-Backport. You may also need help to set it up.
However, if you want to stick to the legacy date-time API, do it as follows:
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
public class Main {
public static void main(String[] args) {
Calendar calendar = Calendar.getInstance();
List<String> dateList = new ArrayList<>();
// Define the format for only day-name and month-name
SimpleDateFormat curFormater = new SimpleDateFormat("EEEE, MMMM");
// Iterate 7-times starting today with date incrementing by 1 after each iteration
for (int i = 1; i <= 7; i++) {
dateList.add(curFormater.format(calendar.getTime()));
calendar.add(Calendar.DATE, 1);
}
// Display the content of dateList
dateList.forEach(System.out::println);
}
}
Output:
Monday, August
Tuesday, August
Wednesday, August
Thursday, August
Friday, August
Saturday, August
Sunday, August
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