Android save array of custom objects

Question

I have a question about saving an arraylist of custom objects. I have a class called notitie:

public class Notitie implements Serializable{

private String titel = "";
private String type = "";
private String datum = "";

public void setTitel (String titel){
    this.titel = titel;
}
public String getTitel(){
    return titel;
}
public void setType (String type){
    this.type = type;
}
public String getType(){
    return type;
}
public void setDatum (String datum){
    this.datum = datum;
}
public String getDatum(){
    return datum;
}
}

I create some objects of Notitie and add them to my arraylist called notities

ArrayList<Notitie> notities = new ArrayList<Notitie>();

Notitie notitie1 = new Notitie();
notitie1.setTitel("Meting");
notitie1.setType("Watermeting");
notitie1.setDatum("22-09-12");
notities.add(notitie1);

Notitie notitie2 = new Notitie();
notitie1.setTitel("Meting2");
notitie1.setType("Watermeting2");
notitie1.setDatum("23-09-12");
notities.add(notitie2);

Notitie notitie3 = new Notitie();
notitie1.setTitel("Meting3");
notitie1.setType("Watermeting3");
notitie1.setDatum("24-09-12");
notities.add(notitie3);

Now I want to save the filled Arraylist on the device's storage so it can be accessed anytime. I used to save data as a String or some Integers with sharedpreferences but I can't save this Arraylist with that. Does anybody have a solution?

Thanks in advance!

Community · Accepted Answer · 2017-05-23 11:59:41Z

6

You do have a few options:

Use serialization, XML or JSON, and store your data in a File. Refer to this solution if you wanna implement serialization.
Store you data using SQLite. Have a look at this tutorial to get started.

EDIT : You might want to read this as well!

edited May 23, 2017 at 11:59

CommunityBot

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answered Sep 23, 2012 at 19:17

Swayam

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4 Comments

Bruiser Over a year ago

Why or in which case would you recommend the first or the second approach?

Swayam Over a year ago

@Bruiser : That is a very good question. The advantage of SQLite is that you can directly display the elements in any ListView using the CursorAdapter, which saves tons of work. Plus, handling Cursor data is really easy once you get the hang of it. Doing the same things using Files might get a little painstaking, if not frustrating. So, for me, SQLite is the way to go.

Bruiser Over a year ago

Thanks a lot for the detailed explanation. I understand that there is of course a lot to consider but that is definitely a very good starting point for further discussion. Here is some more for those who are interested: stackoverflow.com/questions/12212640/… | stackoverflow.com/questions/1803365/…

Swayam Over a year ago

Couldn't agree with you anymore. And yes, there is a lot to consider, but for me, SQLite usually does the job. Anyway, good luck ahead. Cheers.

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