how to keep randomUUID static

Question

I generate the UUID but the problem is that when I close the app and run it again he generate another UUID, I want to generate UUID just for one time, and keep it always the same after installing the application.

private final static String androidId = UUID.randomUUID().toString();

You should save it to SharedPreference and check if it not generated will create new and store it — Công Hải
– Công Hải, Commented Jun 1, 2020 at 3:52
it is not posible is you turn off the app is running, since this variable is static but it belogs to the aplication running. you should persist — tino89
– tino89, Commented Jun 1, 2020 at 4:27
You don't mean 'static', you mean 'persistent'. It already is static. — user207421
– user207421, Commented Jun 1, 2020 at 4:56

ANASS TAHIRI · Accepted Answer · 2020-06-01 12:35:57Z

reference to Công Hải's comment ,I used SharedPreference and it work perfectly:

private static String uuid; SharedPreferences sPrefs = PreferenceManager.getDefaultSharedPreferences(this); uuid = sPrefs.getString("uuid",null); if (uuid == null){ uuid = UUID.randomUUID().toString(); SharedPreferences.Editor editor = sPrefs.edit(); editor.putString("uuid",uuid); editor.apply(); }

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