Is it possible to a List of Objects in putExtra

Question

I know putExtra can be used to pass objects/strings around between actives. But I am trying you put an ArrayList of objects like ArrayList<Foo> in putExtra

Is this possible?

No, but you can make the array parcelable, parcel it, and dump the parcel in putExtra — zgc7009, Apr 25 '14 at 19:48

score 1 · Answer 1 · edited May 23 '17 at 11:49

1

You can use intent.putParcelableArrayListExtra() for passing Arraylist in intent.

Refer to http://developer.android.com/reference/android/content/Intent.html#putParcelableArrayListExtra(java.lang.String, java.util.ArrayList)

EDIT : one more link : Help with passing ArrayList and parcelable Activity

edited May 23 '17 at 11:49

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answered Apr 25 '14 at 19:48

aksdch11

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You need to make sure that the array is actually parcelable for this to work. – zgc7009 Apr 25 '14 at 19:48

score 1 · Accepted Answer · answered Apr 25 '14 at 19:49

No it isn't. You'll need to serialize your object into some kind of string representation. One possible string representation is JSON, and one of the easiest ways to serialize to/from JSON in android, if you ask me, is through Google GSON.

Also if you're just passing objects around then Parcelable was designed for this. It requires a little more effort to use than using Java's native serialization, but it's way faster (and I mean way, WAY faster).

From Docs :

 public class MyParcelable implements Parcelable {
 private int mData;

 public int describeContents() {
     return 0;
 }

 public void writeToParcel(Parcel out, int flags) {
     out.writeInt(mData);
 }

 public static final Parcelable.Creator<MyParcelable> CREATOR
         = new Parcelable.Creator<MyParcelable>() {
     public MyParcelable createFromParcel(Parcel in) {
         return new MyParcelable(in);
     }

     public MyParcelable[] newArray(int size) {
         return new MyParcelable[size];
     }
 };

 private MyParcelable(Parcel in) {
     mData = in.readInt();
 }
}

score 0 · Answer 3 · answered Apr 25 '14 at 19:47

Only for very limited and particular types of "Foo". If i recall correctly Double and Long (or maybe it was Integer?) being those types. There might be a way to smuggle a more generic ArrayList through by encapsulating it in some Serializable Object, but I'm not sure about that.

Is it possible to a List of Objects in putExtra

3 Answers3