Access Fragment View from Activity's onCreate

android, findviewbyid, fragment, oncreate

Solution

Update your views in `onCreateView()`.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
    Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.event_log, container, false);
    TextView tv = (TextView) view.findViewById(R.id.text);
    tv.setText("hello world");
    return view;
}

Or if your changes depend on `Activity` your `Fragment` is attached to, use `onActivityCreated()`.

@Override
public void onActivityCreated (Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    TextView tv = (TextView) getView().findViewById(R.id.text);
    tv.setText(getActivity.getSomeText());
}

Problem

I am in the process of making my first app for Android, and I have a `Fragment` that gets added to my `Activity` in the `Activity`'s `onCreate()` method. The problem I am facing is that I am unable to find any of the views contained within the `Fragment` from the `Activity`'s `onCreate()` method. Other threads have suggested that this is because the `Fragment` has not yet been inflated, so `findViewById()` will return null for any views contained within the `Fragment`. Here is what I mean: Activity: ``` @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.out.println("activity onCreate"); setContentView(R.layout.activity_main); if (savedInstanceState != null) { return; } initialiseUI(); // Fragment added to Activity System.out.println("end of activity onCreate"); } ``` Fragment: ``` @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { System.out.println("fragment onCreateView"); return inflater.inflate(R.layout.event_log, container, false); } ``` This prints the results: activity onCreate end of activity onCreate fragment onCreateView Because of this order, any attempt to access the views of the `Fragment` in the `Activity`'s `onCreate()` method (using `findViewById()`) produces a `NullPointerException`, as the `Fragment`'s `onCreateView()` only gets called AFTER the end of the `Activity`'s `onCreate()`. Using the `FragmentManger`'s `executePendingTransactions()` after adding the `Fragment` doesn't help. Basically, I have been forced to put the problem code in the `Activity`'s `onStart()` method instead of `onCreate()`, as `onStart()` happens AFTER the `Fragment`'s `onCreateView()`. Does anyone what the standard practice here is, or how I can make my Fragment-View-accessing code work within the `Activity`'s `onCreate()` method?

Original source

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