how to store and retrieve (key,value) kind of data using saved preferences android

Question

I have a hash map table as below,

HashMap backUpCurency_values = new HashMap();

and i want to

Answer 1

To store the values use this code

SharedPreferences preferences = getSharedPreferences(
            PREF_FILE_NAME, MODE_PRIVATE);
    if (value.equals("")) {

        boolean storedPreference = preferences.contains(key);
        if (storedPreference) {
            SharedPreferences.Editor editor = preferences.edit();
            editor.remove(key); // value to store
            Log.d("KEY",key);
            editor.commit();
        }
    }else{

        SharedPreferences.Editor editor = preferences.edit();
        editor.putString(key, value); // value to store
        Log.d("KEY",key);
        editor.commit();
    }

To retrieve the values use this code

SharedPreferences preferences = getSharedPreferences(
            PREF_FILE_NAME, MODE_PRIVATE);
    Map map = (Map) preferences.getAll();
    if(!map.isEmpty()){
        Iterator> iterator = map.entrySet().iterator();
        while(iterator.hasNext()){
             Map.Entry pairs = (Map.Entry)iterator.next();
                pairs.getKey()+pairs.getValue();
                      //write code here
        }
    }