如何在 SharedPreference 中存储日期？ [复制]

Question

我希望应用每天执行一次特定的操作，即用户在一天中第一次打开应用时。 为此，我想在 SharedPreference 中存储一个日期。 但它只存储 int、boolean、string 等。

/*

I'm showing my logic here. If there is better way plz tell me!!!
I will give some by default value like 00/00/0000 for initialization.
The first time user starts the app then I will do that particular work and initialize sharedPreference by current date 16/03/2020. 
If user again opens app by same date I don't do that work(By checking curdate and sharedPreference date).
If user opens app on another date I check currentDate and sharedPreference date, if they are different I will do that work and edit the sharedPreference by that day.
*/

那么告诉我如何在 sharedPreference 中存储日期？

Answer 1

您可以将日期存储为时间戳：

long timest = (new Date()).getTime();
// save it to Preferences as Long

然后阅读它并再次转换为Date：

long timest = // read from Preferences as Long
Date date = new Date(timest);