Is it ok to save a JSON array in SharedPreferences?

Question

I have a JSON Array that I need to save. I was thinking about serializing it, but would it be better to just save it as a string in SharedPreferences and then rebuild it whe

Answer 1

Another Easy Way To Save JsonArray Into Sharedprefrences :

  public void SaveFriendList(String key, JSONArray value) {

    FriendLst = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
    SharedPreferences.Editor editor = FriendLst.edit();
    editor.putString(key, value.toString());
    editor.commit();
}



public String LoadFriendList() {
    MyApplication.FriendLst = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
    String FriendLsts = MyApplication.FriendLst.getString("Friends", "");
    return FriendLsts;
}

Just Call this Code to get Your Json :-)

 try {
           JSONArray jarry1 = new JSONArray(LoadFriendList());
           JSONObject jobject;
            datamodelfriends.clear();
             for (int i = 0; i < jarry1.length(); i++) {
                 jobject = jarry1.getJSONObject(i);
                 String FirstName = jobject.get("FirstName").toString();//You can get your own objects like this
                 datamodelfriends.add(new DataModelFriends(FirstName,...));

    }
    mAdapter = new CustomeAdapterFriendList(datamodelfriends, MainActivity.this);

                                RecyclerView_Friends.setAdapter(mAdapter);

                            } catch (Exception e) {
                            }

Answer 2

I have done the same thing ... serialize an objet to a json string and save it into shared prefs. No problem, but understand that ultimately the prefs are an XML file, so if you are reading / writing it a lot, it isn't going to perform well.

Answer 3

Here's a simple version using Kotlin to store a User class:

class PreferenceHelper(context: Context) {

    companion object {
        private const val prefsFileName = "com.example.prefs"
        private const val userConst = "user"
    }

    private val prefs: SharedPreferences = context.getSharedPreferences(prefsFileName, MODE_PRIVATE)

    var user: User?
        get() = GsonBuilder().create().fromJson(prefs.getString(userConst, null), User::class.java)
        set(value) = prefs.edit().putString(userConst, GsonBuilder().create().toJson(value)).apply()

}