CODEWITHSUNDEEP
androidandroid-fragments
Jiawei Yang
Jiawei Yang

Reputation: 1623

Fragment.getView() always return null

I add two fragments to ViewPager in MainActivity dynamically,while I'm trying to get the sub view of the fragments, Fragment.getView() always return null, how can I solve this problem? Thanks in advance.

mLinearLayout= (LinearLayout)fragments.get(0).getView().findViewById(R.id.linear_layout);
    mRelativeLayout= (RelativeLayout) fragments.get(1).getView().findViewById(R.id.relative_layout);

Upvotes: 1

Views: 2656

Answers (2)

roarster
roarster

Reputation: 4086

If I were you, I would use the fragments' onCreateView() to bind the views, then let the parent Activity know about the views through an Interface in onActivityCreated().

Your interface could look like

public interface ViewInterface {
  void onLinearLayoutCreated(LinearLayout layout);
  void onRelativeLayoutCreated(RelativeLayout layout);
}

and then in each fragment

public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  ViewGroup layout = (ViewGroup) inflater.inflate(R.layout.fragment_layout, inflater, false);
  mLinearLayout = layout.findViewById(R.id.linear_layout);
  ...
  return layout;
}

...

public void onActivityCreated (Bundle savedInstanceState) {
  super.onActivityCreated(savedInstanceState);
  try {
    ViewInterface callback = (ViewInterface) getActivity();
    callback.onLinearLayoutCreated(mLinearLayout);
  } catch (ClassCastException e) {
    Log.e("ERROR", getActivity().getName()+" must implement ViewInterface");
  }
  ...
}

and then in your parent Activity that implements ViewInterface

void onLinearLayoutCreated(LinearLayout layout) {
  //do something with LinearLayout
  ...
}

Upvotes: 5

Bob
Bob

Reputation: 13865

Define a interface in the Fragment. Implement it in Activity. You will have the Activity instance in the Fragment. Now, inside onActivityCreated() of Fragment, call the interface method with Activity instance to notify that now the getView() returns its View.

Upvotes: 0

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