Nico Nico - 2 years ago 86
Android Question

Passing an Object from an Activity to a Fragment

I have an

which uses a
. I simply want to pass an object from this
to the

How could I do it?
All the tutorials I've seen so far where retrieving data from resources.


Let's be a bit more precise:

My Activity has a ListView on the left part. When you click on it, the idea is to load a Fragment on the right part.

When I enter this Activity, an Object "Category" is given through the Intent. This Object contains a List of other Objects "Questions" (which contains a List of String). These "Questions" objects are displayed on the ListView.
When I click on one item from the ListView, I want to display the List of String into the Fragment (into a ListView).

To do that, I call the setContentView() from my Activity with a layout. In this layout is defined the Fragment with the correct class to call.
When I call this setContentView(), the onCreateView() of my Fragment is called but at this time, the getArguments() returns null.

How could I manage to have it filled before the call of onCreateView() ?
(tell me if I'm not clear enough)


Answer Source

Create a static method in the Fragment and then get it using getArguments().


public class CommentsFragment extends Fragment {
  private static final String DESCRIBABLE_KEY = "describable_key";
  private Describable mDescribable;

  public static CommentsFragment newInstance(Describable describable) {
    CommentsFragment fragment = new CommentsFragment();
    Bundle bundle = new Bundle();
    bundle.putSerializable(DESCRIBABLE_KEY, describable);

    return fragment;

  public View onCreateView(LayoutInflater inflater,
      ViewGroup container, Bundle savedInstanceState) {

    mDescribable = (Describable) getArguments().getSerializable(

    // The rest of your code

You can afterwards call it from the Activity doing something like:

FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
Fragment fragment = CommentsFragment.newInstance(mDescribable);
ft.replace(, fragment);
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