setArguments() in Fragment and onCreate()

Question

If I create a new Fragment and then I set arguments to it can I rely on those arguments always being available for me in the onCreate() of the Fragment? If yes, how do they do it? If not how I'am I supposed to communicate if they don't want us to write new constructors?

`how do they do it` - how they do what? the arguments are available though the whole fragment's lifecycle — Blackbelt, Dec 06 '18 at 13:37
@Blackbelt in my head I'm thinking `onCreate()` is immediately called so if I have the `setArguments()` on the next line how are they available still on the `onCreate()`? — dfasdflskladf, Dec 06 '18 at 13:52
it is not . setArguments has to be called after you instante the fragment and before committing a transaction. onCreate gets called after you commit a transaction — Blackbelt, Dec 06 '18 at 13:53

score 1 · Answer 1 · answered Dec 06 '18 at 13:33

Try this way any fragment to set argument and get argument..

// pass parameter to pass into bundle
public static NewMessageFragment newInstance(UserData userData) {
    NewMessageFragment newMessageFragment = new NewMessageFragment();
    Bundle bundle = new Bundle();
    bundle.putParcelable(Constants.KEY_MESSAGE_USER_VO, userData);
    newMessageFragment.setArguments(bundle);
    return newMessageFragment;
}

// get value.
private void extractArguments() {
    Bundle bundle = getArguments();
    if (bundle != null) {
        userData = bundle.getParcelable(Constants.KEY_MESSAGE_USER_VO);
    }
}

extractArguments() method called into onCreateView() method.

score 0 · Accepted Answer · answered Dec 06 '18 at 13:36

Yes, your arguments are avaialble in onCreate method. Please check it out this response in order to see how to pass arguments to fragments: How to transfer some data to another Fragment?

Another way to communicate with the fragment is via a interface that your activity is implementing and you pass it as a reference to your fragment, in onAttach method. More info: https://developer.android.com/training/basics/fragments/communicating

Basic Communication between two fragments

setArguments() in Fragment and onCreate()

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