How to pass an arraylist of arraylist objects in android intent?

Question

Is it possible to pass an arraylist with arraylists of objects through an intent?

If so, how could you do it? Is it still Parcelable.

So I have arraylist of objects that I'm putting into my main array, and I need that data in the next activity or intent.

Thanks!

Android Intents are not supposed to carry a large amount of data. You could save that array of arrays in somewhere and retrieve them in the second activity. — frogatto, Feb 25 '16 at 20:44
Possible duplicate of [Intent putExtra ArrayList](http://stackoverflow.com/questions/18050030/intent-putextra-arraylistnamevaluepair) — Sebastian Walla, Feb 25 '16 at 20:54
Possible duplicate of [Android Parcelable Problem with array](http://stackoverflow.com/questions/7166770/android-parcelable-problem-with-array) — Varun, Feb 25 '16 at 21:10
Like I stated, I want to pass an arraylist that has arraylists in it! Those arraylists are object arraylists. So it a single arraylist with arraylists in it. Thanks! — huey77, Feb 25 '16 at 21:12

score 1 · Answer 1 · answered Feb 25 '16 at 20:50

1

of course this is totally do able:

create a class which implements Parcelable:

public class SampleObject implements Parcelable {

    public String name;

    public SampleObject(){}

    public SampleObject(Parcel source){
        this.name  = source.readString();
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(name);
    }

    public static final Parcelable.Creator<SampleObject> CREATOR = new Parcelable.Creator<SampleObject>(){
        @Override
        public SampleObject createFromParcel(Parcel source) {
            return new SampleObject(source);
        }

        @Override
        public SampleObject[] newArray(int size) {
            return new SampleObject[size];
        }
    } ;
}

then when creating the Intent pass as parcelable:

Intent myIntent = new Intent(MainActivity.this, NewIntent.class);
// pass the list here, im using a new List as a sample
myIntent.putParcelableArrayListExtra("NAME", new ArrayList<SampleObject>());
startActivity(myIntent);

answered Feb 25 '16 at 20:50

kandroidj

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A similar easy way is to use Serializable - see http://stackoverflow.com/questions/14333449/passing-data-through-intent-using-serializable – Doron Yakovlev Golani Feb 25 '16 at 20:52
1

@DoronYakovlev-Golani correct, you can do this but android recommends Parcelable as it is better for performance. Serializable is slow compared to Parcelable – kandroidj Feb 25 '16 at 20:53
I agree that performance wise you are absolutely correct. However from code the simplicity and maintenance perspectives, Serializable has many advantages. – Doron Yakovlev Golani Feb 25 '16 at 21:02
The example above seems to pass an arraylist of objects. I want to pass an arraylist with arraylists in it. And those arraylist are object arraylists. Thanks! – huey77 Feb 25 '16 at 21:11
@huey77 can you show me a code sample. And i will update the answer for your needs – kandroidj Feb 27 '16 at 00:19
thanks, but I went a different way about handling my situation. Thanks though. @inner_class7 – huey77 Mar 02 '16 at 20:32

score 0 · Answer 2 · answered Mar 20 '16 at 05:39

You can pass an ArrayList<E> the same way, if the E type is Serializable/Parcelable.

You would call the putExtra (String name, Serializable value) of Intent to store, and getSerializableExtra (String name) for retrieval.

Example:

ArrayList<ArrayList<String>> myList = new ArrayList<ArrayList<String>>();
intent.putExtra("mylist", myList);

In the other Activity:

ArrayList<ArrayList<String>> myList = (ArrayList<ArrayList<String>>) getIntent().getSerializableExtra("mylist");

or

ArrayList<ArrayList<String>> myList = new ArrayList<ArrayList<String>>();
    intent.putParcelableArrayListExtra("mylist", myList);
     ArrayList<ArrayList<String>> myList = (ArrayList<ArrayList<String>>) getIntent().getParcelableArrayListExtra("mylist");

Not a solution on 2020, instantly syntax error, parcelable better solution. https://developer.android.com/reference/android/os/Parcelable.html — deon cagadoes, Jan 09 '20 at 00:48

How to pass an arraylist of arraylist objects in android intent?

2 Answers2