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I'm working on a app where you can save and read homeworks, for the "undone" progress I want to save the Arraylist, where I saved all homeworks, in the Shared Preferences. I hope you know what I mean, thanks in advance :)

HausaufgabenActivity.java:

    ArrayList<Hausaufgabe> hausaufgabeList = new ArrayList<Hausaufgabe>();
    SharedPreferences.Editor editor;

    if(!hausaufgabeList.contains(ha)){
       hausaufgabeList.add(ha);
    }
    //Set the values
    Set<Hausaufgabe> set = new HashSet<Hausaufgabe>();
    set.addAll(hausaufgabeList);
    editor.putString("AllHomeworks", set);
    editor.commit();

Hausaufgabe.java:

public Hausaufgabe(String beschreibung, String DeviceID, String Abgabedatum, String Fach, String Erstellungsdatum){
    super();
    this.beschreibung = beschreibung;
    this.DeviceID = DeviceID;
    this.Abgabedatum = Abgabedatum;
    this.Fach = Fach;
    this.Erstellungsdatum = Erstellungsdatum;
}


public String getBeschreibung() {
    return beschreibung;
}

public String getAbgabedatum() {
    return Abgabedatum;
}

public String getFach() {
    return Fach;
}

public String getDeviceID() {
    return DeviceID;
}

public String getErstellungsdatum() {
    return Erstellungsdatum;
}

}

rib
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1 Answers1

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You should try : 

Set<Hausaufgabe> set = new HashSet<Hausaufgabe>();
set.addAll(hausaufgabeList);
editor.putStringSet("AllHomeworks", set);
editor.commit();

where

editor.putString("AllHomeworks", set);   -> editor.putStringSet("AllHomeworks", set);
Niels Waughray-Dupoux
  • 34
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  • Tried it, put it says: editor.putSTRINGset(...), i would need something like editor.putHausaufgabeSet(...) – rib Jun 01 '16 at 16:02
  • Okay, didn't noticed that it wasn't String in HashSet :D You should try to serialize it. Then save serialized object as string in SharedPreference – Niels Waughray-Dupoux Jun 01 '16 at 16:08
  • https://github.com/apache/pig/blob/89c2e8e76c68d0d0abe6a36b4e08ddc56979796f/src/org/apache/pig/impl/util/ObjectSerializer.java Then mSpEditor.putString("AllHomeworks" ObjectSerializer.serialize(hausaufgabeList)); – Niels Waughray-Dupoux Jun 01 '16 at 16:11
  • what do you mean with serialize? I serialize an Arraylist into a string? – rib Jun 01 '16 at 16:45
  • and how will I get a Arraylist out of this? – rib Jun 01 '16 at 17:07
  • By using ArrayList hausaufgabeList = (ArrayList hausaufgabeList = ) ObjectSerializer.deserialize(yourSerializedString) – Niels Waughray-Dupoux Jun 06 '16 at 16:00