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
– frogatto, Commented Feb 25, 2016 at 20:44
Possible duplicate of Intent putExtra ArrayList<NameValuePair> — Sebastian Walla
– Sebastian Walla, Commented Feb 25, 2016 at 20:54
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
– huey77, Commented Feb 25, 2016 at 21:12

kandroidj · Accepted Answer · 2016-02-25 20:50:14Z

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, 2016 at 20:50

kandroidj

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6 Comments

Doron Yakovlev Golani Over a year ago

A similar easy way is to use Serializable - see stackoverflow.com/questions/14333449/…

kandroidj Over a year ago

@DoronYakovlev-Golani correct, you can do this but android recommends Parcelable as it is better for performance. Serializable is slow compared to Parcelable

Doron Yakovlev Golani Over a year ago

I agree that performance wise you are absolutely correct. However from code the simplicity and maintenance perspectives, Serializable has many advantages.

huey77 Over a year ago

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!

kandroidj Over a year ago

@huey77 can you show me a code sample. And i will update the answer for your needs

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