i have ArrayList with multiple value. i want to convert this ArrayList into String to save in sharedPreferences, then I want to retrieve the String and convert it back to ArrayList
Please tell how to do that? (or any other idea to store and retrieve ArrayList)
Convert arraylist to string:
String str = "";
for (String s : arraylist)
{
str += s + ",";
}
Save string into sharedpreference:
PreferenceManager.getDefaultSharedPreferences(context).edit().putString("mystr", str).commit();
get string from sharedpreference:
String str = PreferenceManager.getDefaultSharedPreferences(context).getString("mystr", "defaultStringIfNothingFound");
Convert string to arraylist:
List<String> arraylist = new ArrayList<String>(Arrays.asList(str.split(",")));
You can use Google's GSON.
Gson is a Java library that can be used to convert Java Objects into their JSON representation. It can also be used to convert a JSON string to an equivalent Java object. Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.
http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/Gson.html
https://code.google.com/p/google-gson/
You get the idea:
- Store: Convert Object to JSON String -> Save string
- Retrieve: Get string -> Convert from JSON to Object
