How to Implement My Custom Toolbar in My Fragment

Custom Toolbar for each fragment using Navigation component

I tried to use this method (activity as? AppCompatActivity)?.setSupportActionBar(toolbar) in Fragment but it duplicated toolbar.

This is expected because the toolbar is hosted by the activity, and as Jetpack navigation architecture components uses a single-activity model, then all navGraph fragments hosted by this activity share this toolbar (because it's a part of the activity).

And therefore resetting the toolbar again will duplicate it.

The solution to this is to remove the toolbar from the activity, and use a unique toolbar within every fragment layout, this way when a fragment is transacted to another; the layout of the old fragment is replaced with the new layout of the new fragment, so the old toolbar is gone, and we've a new toolbar; and at this time you need to call setSupportActionBar(toolbar) for the new toolbar.

But notice that every time you call setSupportActionBar(toolbar) you have to recall setupActionBarWithNavController() because it needs to be attached to the new toolbar.

UPDATE

So, I have to call setSupportActionBar(toolbar) and setupActionBarWithNavController() in Fragment?

Actually you can call setSupportActionBar(toolbar) in the activity. But you can use requireActivity() in fragment to do that:

In order not to repeat things, you can have a function the activity to do that:

In activity:

fun setupActionBar(toolBar: Toolbar) {

    setSupportActionBar(toolbar)

    val navHostFragment =
        supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment

    navController = navHostFragment.navController

    setupActionBarWithNavController(navController)
    
}   

And in fragment:

val toolbar = findViewById<Toolbar>(R.id.foo)
(requireActivity() as MainActivity).setupActionBar(toolbar)

How to put custom toolbar inside fragment?

So this is how I did it. My app is based on single activity-multi-fragment model.

I had set activity theme to AppTheme.NoActionBar, so it enabled me to set a custom toolbar.

Later for each fragment I had a separate layout and within which added a custom toolbar like below

<androidx.appcompat.widget.Toolbar 
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/colorPrimary">
....
....
</androidx.appcompat.widget.Toolbar>

Within this layout I had added menu items.

If you don't want to follow this, may be you should look at getActionBar().setCustomView(). Keep your activity theme set, so getActionBar() is not null.

You can control action bar layout by calling getActionBar().setCustomView() in fragment onResume() or probably when you are adding or removing a fragment in your activity.

Add Toolbar inside fragment (AndroidX)

so what was the successfull answer for me:

Inside onCreate method just add setHasOptionsMenu(true);

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

Inside my WallFragment.java in onCreateView I added setOnMenuItemClickListener just right after initializing the Toolbar

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View inflatedView = inflater.inflate(R.layout.fragment_wall, container, false);

        TopActivityToolbar = inflatedView.findViewById(R.id.update_wall_page_toolbar);
        TopActivityToolbar.setTitle("someTitle");
        TopActivityToolbar.inflateMenu(R.menu.menu_app_actionbar_wall);

        // and finally set click listener
        TopActivityToolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                // Your code inside Toolbar onClick...
                return false;
            }
        });
        return inflatedView;
    }

Do not forget to to INFLATE the menu from res/menu/...

Add SearchView to Custom Toolbar in a Fragment

Solved it with adding setSupportActionBar(toolbar) in onCreateView()

How to add Toolbar to a fragment in android?

Cast your activity from getActivity() to AppCompatActivity first. I think this will solve your error:

((AppCompatActivity) getActivity()).getSupportActionBar(toolbar);

Or in your case:

((AppCompatActivity) getActivity()).setSupportActionController(toolbar);

getActivity() returns a FragmentActivity and you need to get AppCompatActivity returned. Hope this helps!

How to get Toolbar from fragment?

You need to cast your activity from getActivity() to AppCompatActivity first. Here's an example:

((AppCompatActivity) getActivity()).getSupportActionBar().setTitle();

The reason you have to cast it is because getActivity() returns a FragmentActivity and you need an AppCompatActivity

In Kotlin:

(activity as AppCompatActivity).supportActionBar?.title = "My Title"

custom toolbar not visible in fragment

Height of toolbar and other relative layouts are same i.e. android:layout_height="?android:attr/actionBarSize"

That's why there is only Header layout is visible not the search layout because header layout occupying the whole height of the toolbar and search layout is below the header layout.
Change the height of toolbar and you will get the desired result.

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