Snippet - wait for onCreateView () to complete before running the methods

Question

I am struggling with a cryptic sequence of events related to Fragment. I am trying to add a fragment in Activity, and then call a method inside the fragment to update some text. However, what I find is that the method is processed in the fragment to completion onCreateView(), which leaves me with a null object View, and my method fails. Here is the code Activity:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_log_entry_details);

    fragmentManager = getSupportFragmentManager();

    titleBarFragment = new TitleBarVerticalFragment();

    fragmentTransaction = fragmentManager.beginTransaction ();
    fragmentTransaction.add(R.id.log_entry_title_frame, titleBarFragment);
    fragmentTransaction.commit();

    titleBarFragment.updateTitleBar("Edit Log Entry", 20, false);
}

It seems simple enough. Here is the TitleBarVerticalFragment class:

public class TitleBarVerticalFragment extends TitleBarFragment {

    @Inject SharedVisualElements sharedVisualElements;

    View view;
    TextView titleLabel;

    public TitleBarVerticalFragment() {
        // add this line for any class that want to use any of the singleton objects
        Injector.INSTANCE.getAppComponent().inject(this);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        super.onCreateView(inflater, container, savedInstanceState);

        Log.d(Constants.TAG, "title fragment onCreateView()");

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

        ImageView logoImage = (ImageView) view.findViewById(R.id.logo_vertical);
        titleLabel = (TextView) view.findViewById(R.id.verticalTitleLabel);

        titleLabel.setTextColor(sharedVisualElements.secondaryFontColor());
        titleLabel.setTypeface(sharedVisualElements.font());
        titleLabel.setTextSize(20);

        logoImage.setImageDrawable(sharedVisualElements.logoImage());
        logoImage.setBackgroundColor(Color.TRANSPARENT);

        return view;
    }

    public void updateTitleBar(String text, int textSize, boolean titleLabelIsHidden) {

        Log.d(Constants.TAG, "about to update title bar text");

        if (view == null) {
            Log.d(Constants.TAG, "vertical title fragment is null");
            return;
        }

        if (titleLabel == null)
            titleLabel = (TextView) view.findViewById(R.id.verticalTitleLabel);

        if (titleLabel == null) {
            Log.d(Constants.TAG, "vertical title label is null");
            return;
        }

        Log.d(Constants.TAG, "updating title text: " + text);
        titleLabel.setText(text);
        titleLabel.setTextSize(textSize);
    }

Pay attention to the output order of this logarithm. Notice how it onCreateView()works after the method updateTitleBar()? How can it be?

to update header text, vertical header fragment null header fragment onCreateView ()

, onCreateView() , ? .

Answer 1

.

interface LyfecycleListener {
  void onCreatedView();
}

:

@Override
protected void onCreate(Bundle savedInstanceState) {
  ...
  this.titleBarFragment = new TitleBarVerticalFragment();
  this.titleBarFragment.setListener(this)
  ...
}

@Override
public void onCreatedView() {
  titleBarFragment.updateTitleBar("Edit Log Entry", 20, false);
}

:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

...

  this.listener.onCreatedView();
}

Answer 2

fragmentManager.executePendingTransactions() Transaction.commit(); BarFragment.updateTitleBar( " ", 20, false);

Answer 3

onStart()