[英]how to keep randomUUID static
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.我生成了 UUID,但问题是当我关闭应用程序并再次运行它时,他会生成另一个 UUID,我只想生成一次 UUID,并在安装应用程序后始终保持相同。
private final static String androidId = UUID.randomUUID().toString();
reference to Công Hải's comment,I used SharedPreference and it work perfectly:参考 Công Hải 的评论,我使用了 SharedPreference 并且效果很好:
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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