Store ArrayList of Objects in Android

Question

I have an ArrayList of String objects that is keeping values as needed.
now i want to keep it save either as a FILE or in SharedPreferences or converting it into JSON ARRAY and saving..
My array list is like this:

  ArrayList<Struct_Saved_Domains> arraylist = new ArrayList<Struct_Saved_Domains>();

How can i do this? Any Idea??

check this answer here stackoverflow.com/questions/12350800/… — Marko Niciforovic
– Marko Niciforovic, Commented Mar 1, 2013 at 14:17

waqaslam · Accepted Answer · 2013-03-01 14:24:29Z

2

You may use Gson to convert your object into string and then save it in shared preferences:

SharedPreferences prefs = context.getSharedPreferences("prefName", Context.MODE_PRIVATE);
Editor editor = prefs.edit();
editor.putStringSet("myList", new Gson().toJson(arraylist).toString());
editor.apply();

answered Mar 1, 2013 at 14:24

waqaslam

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7 Comments

Noman Over a year ago

How to add the Gson?? Any jar file?

waqaslam Over a year ago

download the library's jar file and put it inside libs folder of your project. If you dont have such folder then create one manually. Afterwards you are ready to go.

Noman Over a year ago

@Waqas.. yeah i got it now.. its included..Thanks

Noman Over a year ago

@Waqas.. Shared pref is not reliable.. like when i exit the app and reload it and try to save new values then the old values are gone. CAn u suggest me any other way to keep old values in the array and adding new ones ??

waqaslam Over a year ago

which android API version are you using for your app? if its gingerbread or above then please call apply() instead of commit() on your preference editor.

|

itsrajesh4uguys · Accepted Answer · 2013-03-01 15:07:33Z

You can use the below code for shared preferences.

public class WebService {

    String PREF_NAME = "PREF_NAME";
    public static SharedPreferences sp;
    Editor spEdit;

    public String UserID;
    public String Password;


    public LoginWebService(Context ctx) {
        // TODO Auto-geneated constructor stub
        sp = ctx.getSharedPreferences(PREF_NAME, 0);
        spEdit = sp.edit();
    }

    public void setUserID(String UserID) {
        spEdit.putString("UserID", UserID);
        spEdit.commit();

    }

    public String getUserID() {
        return sp.getString("UserID", "");    
    }

    public String getPassword() {
        return sp.getString("Password", "");
    }

    public void setPassword(String Password) {
        spEdit.putString("Password", Password);
        spEdit.commit();
    }





    public void clear(){
        spEdit.clear();
        spEdit.commit();
    }

}

While saving the data in the shared preferences you can use like below.

WebService objlogin=new WebService(context);
objlogin.clear();

for (int i = 0; i <arraylist.size(); i++) 
{
objlogin.setUserID(arraylist.get(i).something); 
objlogin.setPassword(arraylist.get(i).something); 

}

Then you all the data's will be saved in the shard preferences.

Hope this will help you.

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