java - how to save a dynamic string? -

in app current time , convert string.

as see string changed every time open activity want save time string in static string if went activity show user.

this code far:

    time = new time();     now.settonow();     string str = now.tostring().substring(0, 15);     textview.settext(str); 

actually have listview has items. time string in listview.onitemclicklistener , want whenever item created save time , when users clicked on show time in second activity.
example if user created item in listview in 2 days ago, when clicks on item show 2 days ago date , time:

this code more details:

first activity:

list.setonitemclicklistener(new onitemclicklistener() {          @override         public void onitemclick(adapterview<?> arg0, view arg1, int arg2,                 long arg3) {             time = new time();             now.settonow();             string timedate = now.tostring().substring(0, 15);             intent intent = new intent(albums.this, albumpage.class);             intent.putextra("extra", timedate);             startactivity(intent);         } 

second activity:

string str = getintent().getextras().getstring("extra"); textview.settext(str); 

in way when click on each item shows current time not time item created (my listview dynamic user can add or delete items).

try below code:

     sharedpreferences sharedpreferences = getsharedpreferences("myprefs", context.mode_private);   editor editor = pref.edit();     time = new time();     now.settonow();     string str = now.tostring().substring(0, 15);     editor.putstring("key_name", str);      editor.commit();     textview.settext(str);