Where to set-up the toolbar in a fragment? onCreate() or onStart()?

Issue

I'm writing an app that involves several activities: each of them is composed by more fragments. In almost each fragment I want to set-up a different toolbar... where should I do that? I used to do almost everything inside the onCreate() or the onCreateView(), but now I'm asking myself: maybe it's more correct to put it in the onStart()? I know how activity and fragment lifecycles work... but I didn't find an answer to my specific case. Here's the code I used in one of the fragments:

// Toolbar setup
setHasOptionsMenu(true);
AppCompatActivity activity = (AppCompatActivity) getActivity();
ActionBar actionBar = activity.getSupportActionBar();
if (actionBar != null)
    actionBar.setDisplayHomeAsUpEnabled(true);
    Toolbar tb = (Toolbar) activity.findViewById(R.id.toolbar_main);
    tb.setNavigationOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            FragmentManager mng = getFragmentManager();
            mng.popBackStack();
        }
    }); 
if (activity.getSupportActionBar() != null)
    activity.getSupportActionBar().setTitle(R.string.toolbar_title);
    tb.setVisibility(View.VISIBLE);

Here's a part of the activity_main.xml file where R.id.toolbar_main is defined:

<!--- [...] --->
<android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar_main"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<!--- [...] --->

Solution

Do it in .onCreate() method - see Google's sample project for Material design: https://github.com/chrisbanes/cheesesquare

Answered By - Alex Shutov