Passing an Object from an Activity to a Fragment

Question

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

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

EDIT :

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)

Thanks

Answer 1

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

Example:

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);     fragment.setArguments(bundle);      return fragment;   }    @Override   public View onCreateView(LayoutInflater inflater,       ViewGroup container, Bundle savedInstanceState) {      mDescribable = (Describable) getArguments().getSerializable(         DESCRIBABLE_KEY);      // 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(R.id.comments_fragment, fragment); ft.commit(); 

Answer 2

In your activity class:

public class BasicActivity extends Activity {  private ComplexObject co;  @Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main_page);      co=new ComplexObject();     getIntent().putExtra("complexObject", co);      FragmentManager fragmentManager = getFragmentManager();     Fragment1 f1 = new Fragment1();     fragmentManager.beginTransaction()             .replace(R.id.frameLayout, f1).commit();  } 

Note: Your object should implement Serializable interface

Then in your fragment :

public class Fragment1 extends Fragment {  ComplexObject co;  @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,         Bundle savedInstanceState) {     Intent i = getActivity().getIntent();      co = (ComplexObject) i.getSerializableExtra("complexObject");      View view = inflater.inflate(R.layout.test_page, container, false);     TextView textView = (TextView) view.findViewById(R.id.DENEME);     textView.setText(co.getName());      return view; } }