How to save a date in SharedPreferences

Question

Please tell me how to save a Date (Date ddd;) in SharedPreferences and then compare ddd with the current date? The standard form for writing the variable SharedPreferences looks like this, but how can I get a date there?

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE); SharedPreferences.Editor editor = sharedPref.edit(); editor.putInt(getString(R.string.saved_high_score), newHighScore); editor.commit();

As an option to keep the line, and when you need to get a date, then convert the line to a date via DateFormatter

katso katso 10.4k 3 25 48 · Accepted Answer · 2015-11-19T09:29:21

Save as long

 Date date = new Date() SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE); SharedPreferences.Editor editor = sharedPref.edit(); editor.putLong("date", date.getTime()); editor.commit();

Then compare two long 'a

for some reason, Android Studio swears at the first line of SharedPreferences, writes - can not resolve method getActivity ()
In the activation, the call to the getActivity() method should be skipped - SharedPreferences sharedPref = getPreferences(Context.MODE_PRIVATE);
/ Even a novice developer should understand such simple things.

Vladyslav Matviienko Vladyslav Matviienko 19.2k 2 21 48 · Answer 2 · 2015-11-19T09:29:22

You just need to know that Date is in fact a wrapper over ordinary Long . Date has a getTime() method that returns the number of milliseconds since 1980 (I don’t remember the exact date). Save the value that g etTime() returns. You can restore it by passing it to the long constructor, which you will get from SharedPreferences .

If not mistaken, it returns the number of milliseconds from 00:00 01.01.

How to save a date in SharedPreferences

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