如何将日期存储为 SharedPreference？ [关闭]

Question

I asked same question before but it got closed and associated with another question which not solving my problem.

当用户在一天中第一次打开应用程序时，我希望应用程序每天执行一次特定的操作。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

您可以通过将日期转换为字符串来将日期保存在 SharedPreferences 中。 请通过“savedates”方法找到保存日期的示例。您将以字符串形式传递上下文和日期。 context 将是当前上下文。

    public static void savedates(Context context, String date) {
    SharedPreferences.Editor editor = context.getSharedPreferences("MyPref", MODE_PRIVATE).edit();
    editor.putString("datestr", date);
    editor.apply();
}

    public static String getDates(Context context) {
    SharedPreferences prefs = context.getSharedPreferences("MyPref", MODE_PRIVATE);
     return prefs.getString("datestr", "");
}

Answer 2

//create sharedpreference object
 SharedPreferences.Editor myeditor = context.getSharedPreferences("MyPref", MODE_PRIVATE).edit();

// to get current date.
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
String date = sdf.format(new Date());

//store date in sharedpreference
myeditor.putString("mydate",date);
myeditor.commit();