How to add each and every value of sharedpref.getstringset to an arraylist?

Question

I'm trying to put user names in string set by using SharedPreferences.putstringset, the problem is that I want to get each name(value) the user put and add it to an arraylist and print each value.

I tried pref.getstringset but I don't know how to do it.

SharedPreferences.Editor editor=pref.edit();
editor.putStringSet("user names",usernames.getText().toString());
editor.commit();

You can use getStringSet to get the HashSet back and then iterate overit. — Rohit Suthar, Aug 14 '19 at 12:23
I tried pref.getstringset but I don't know how to do it, as mentioned in the question above. — peter Estifanos, Aug 14 '19 at 12:25
You can use `Gson` try this answer [https://stackoverflow.com/a/53606612/10037223](https://stackoverflow.com/a/53606612/10037223) — Hamed.Ghaderian, Aug 14 '19 at 12:30

score 1 · Answer 1 · answered Aug 14 '19 at 12:28

1

Store the user names in a set like this :-

Set<String> userNames = new HashSet<>();
userNames.add(usernames.getText().toString())

Then put the set in share preferences :-

editor.putStringSet("user names",userNames);
editor.commit();

Then finally get it with a default value and print it :-

for(String name : pref.getStringSet("user names", new HashSet<>()))
    System.out.println(name);

answered Aug 14 '19 at 12:28

Santanu Sur

10,997
7
33
52

an error message say(ClassCastException: java.lang.String cannot be cast to java.util.Set at android.app.SharedPreferencesImpl.getStringSet(SharedPreferencesImpl.java:234)).. The compiler was refering to this line of code ( for(String name : pref.getStringSet("user names", new HashSet<>())) System.out.println(name);) – peter Estifanos Aug 14 '19 at 18:22

score 0 · Answer 2 · answered Aug 14 '19 at 12:27

0

Set<String> fetch = editor.getStringSet("your_key", null);
Iterator value = set.iterator(); 
while (value.hasNext()) { 
   //do whatever you want
   //add to the arraylist

}

answered Aug 14 '19 at 12:27

Rohit Suthar

967
9
22

How to add each and every value of sharedpref.getstringset to an arraylist?

2 Answers2