NullPointerException in Fragment's onCreateView() method

Question

My code:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // t-alk és impresszumhoz
         


        

Answer 1

Here are the internals of the Fragment life cycle:

---

FragmentManager sets the activity value for a Fragment performing a state transition:

f.mActivity = mActivity;
f.mFragmentManager = mActivity.mFragments;
f.mCalled = false;
f.onAttach(mActivity);

Also, it sets this value to null, after detaching the Fragment:

f.mCalled = false;
f.onDetach();

. . .

f.mActivity = null;
f.mFragmentManager = null;

So, The value should not be null, between onAttach() and onDetach(), if every thing else is fine.

---

To be safe, move all such code to onActivityCreated();

Answer 2

First I needed to inflate the layout, to be able to use findViewById() .

Finally the solution:

This is not needed:

LinearLayout layout = (LinearLayout) view
                .findViewById(R.layout.impresszum);

Instead this should be used:

View view = inflater.inflate(R.layout.impresszum, container, false);

And another modification in this line:

((TextView) **view**.findViewById(R.id.impresszumtext1))
                        .setText(appName + " v." + versionName);

I have found some explanation, too: If I am thinking right, first I needed to inflate the layout to be able to access the objects using "findViewById"... It is sneaking, because setcontentview() does this for us.