Question

I’m trying to iterate over a collection of shared preferences, and generate an ArrayList of HashMaps, but having an issue.

SharedPreferences settings = getSharedPreferences(pref, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putString("key1", "value1");
editor.putString("key2", "value2");

and then I was thinking something along the lines of:

final ArrayList<HashMap<String,String>> LIST = new ArrayList<HashMap<String,String>>();
SharedPreferences settings = getSharedPreferences(pref, 0);
Map<String, ?> items = settings.getAll();
for(String s : items.keySet()){
    HashMap<String,String> temp = new HashMap<String,String>();
    temp.put("key", s);
    temp.put("value", items.get(s));
    LIST.add(temp);
}

This gives the following error:

The method put(String, String) in the type HashMap<String,String> is not applicable for the arguments (String, capture#5-of ?)

Is there a better way to do this?

Answer 1

Hache had the correct idea. An Object is not a String, so .toString() was necessary.

final ArrayList<HashMap<String,String>> LIST = new ArrayList<HashMap<String,String>>();
SharedPreferences settings = getSharedPreferences(pref, 0);
Map<String, ?> items = settings.getAll();
for(String s : items.keySet()){
    HashMap<String,String> temp = new HashMap<String,String>();
    temp.put("key", s);
    temp.put("value", items.get(s).toString());
    LIST.add(temp);
}