Setting Custom Actionbar Title from Fragment

Setting Custom ActionBar Title from Fragment

===Update October, 30, 2019===

Since we have new components such as ViewModel and LiveData, we can have a different/easier way to update Activity Title from Fragment by using ViewModel and Live Data

Activity

class MainActivity : AppCompatActivity() {
private lateinit var viewModel: MainViewModel
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.main_activity)
    if (savedInstanceState == null) {
        supportFragmentManager.beginTransaction()
            .replace(R.id.container, MainFragment.newInstance())
            .commitNow()
    }
    viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)
    viewModel.title.observe(this, Observer {
        supportActionBar?.title = it
    })
} }

MainFragment

class MainFragment : Fragment() {
companion object {
    fun newInstance() = MainFragment()
}
private lateinit var viewModel: MainViewModel
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                          savedInstanceState: Bundle?): View {
    return inflater.inflate(R.layout.main_fragment, container, false)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)
    activity?.run {
        viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)
    } ?: throw Throwable("invalid activity")
    viewModel.updateActionBarTitle("Custom Title From Fragment")
} }

And MainModelView:

class MainViewModel : ViewModel() {
private val _title = MutableLiveData<String>()
val title: LiveData<String>
get() = _title
fun updateActionBarTitle(title: String) = _title.postValue(title) }

And then you can update the Activity title from Fragment using viewModel.updateActionBarTitle("Custom Title From Fragment")

===Update April, 10, 2015===

You should use listener to update your action bar title

Fragment:

public class UpdateActionBarTitleFragment extends Fragment {
    private OnFragmentInteractionListener mListener;

    public UpdateActionBarTitleFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        if (mListener != null) {
            mListener.onFragmentInteraction("Custom Title");
        }
        return inflater.inflate(R.layout.fragment_update_action_bar_title2, container, false);
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (OnFragmentInteractionListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnFragmentInteractionListener {
        public void onFragmentInteraction(String title);
    }
}

And Activity:

public class UpdateActionBarTitleActivity extends ActionBarActivity implements UpdateActionBarTitleFragment.OnFragmentInteractionListener {

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

    @Override
    public void onFragmentInteraction(String title) {
        getSupportActionBar().setTitle(title);
    }
}

Read more here: https://developer.android.com/training/basics/fragments/communicating.html

change custom ActionBar title from fragment in android

Create method in your Activity

public void setActionBarTitle(String title) {
    mTitle.setText(title);    // as you used custom view
}

In SecondFragment change title in onCreate or onResume

((YourActivity)getActivity()).setActionBarTitle("Create New Task");

how change Action Bar title from fragment to fragment?

i.e bcoz you not calling restoreActionBar() function anywhere in your code.

you can change actionbar Title as you navigate from fragment to fragment by like this aswell in onCreateView()of each Fragment.

ActionBar actionBar = getActivity().getActionBar();
        actionBar.setTitle("Your title");

Change ActionBar title using Fragments

In your activity:

public void setActionBarTitle(String title) {
    getSupportActionBar().setTitle(title);
}

And in your fragment (You can put it onCreate or onResume):

 public void onResume(){
        super.onResume();

    // Set title bar
    ((MainFragmentActivity) getActivity())
            .setActionBarTitle("Your title");

}

Change ActionBar title from Fragment

I don't know if it's a proper way to do that but you can add a page change listener to your viewpager and in onPageSelected method you can change your title:

yourViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                // change your title
                // inflate menu
                // customize your toolbar
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

How to Change ActionBar title in fragment class in kotlin?

It seems like you're setting the support action bar, so you'd have to use the support action bar in the onCreateView method too. The actionBar is null, that's why the code to set the title won't run.

Try this out:

override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
  super.onViewCreated(view, savedInstanceState)

  (activity as AppCompatActivity).supportActionBar?.title = "Example 1"
  //...
}

The other problem I think you might run into is that you're adding the support action bar in the activity's onCreate method, but you're trying to access it in the fragment's onViewCreated which comes before according to this (I haven't really tried this out, it's just from looking at the diagram). If this is the case, then you'd have to change it. Maybe try the onStart from the fragment.

Change ActionBar title in the fragments

First create Interface

public interface ToolbarInterface {

public void getToolbarResources(String title, int visibility);
}

Implement it in Your activity

public class NavigationDrawerActivity extends AppCompatActivity
    implements ToolbarInterface

And override interface method in activity

 @Override
public void getToolbarResources(String title, int visibility) {
        getSupportActionBar().setTitle(title);
    }
}

In Fragment call interface in Oncreete method like

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
 ToolbarInterface toolbarCallback = (ToolbarInterface) getActivity();
}

And set title from onCreateView Method like

toolbarCallback.getToolbarResources("Toolbar title",1);

How to change the ActionBar title from the fragment class in Android Studio?

Based on your code you don't need to change action bar title from fragment

you can change inside your switch case

@Override
public void onNavigationDrawerItemSelected(int position) {
    // update the main content by replacing fragments
    Fragment fragment = null;
    String title = "";

    switch (position) {
        case 0:
            fragment = new HomeFragment();
            title="Home";
            break;
        case 1:
            fragment = new AccountFragment();
            title="Accounts";
            break;
    }
    if (fragment == null) {
        fragment = new HomeFragment();
    }
    // update the main content by replacing fragments
    FragmentManager fragmentManager = getFragmentManager();
    fragmentManager.beginTransaction()
            .replace(R.id.container, fragment)
            .commit();

    getSupportActionBar().setTitle(title);
}

Even if you want to change actionbar from fragment use interface
Create a interface inside fragment
Implement the Interface in Activity
When you want to change actionbar using callback call the interface function in Activity

Dynamic ActionBar title from a Fragment using AndroidX Navigation

As of 1.0.0-alpha08, you can have the NavigationUI bits dynamically set the title... if the dynamic bits are arguments on the navigation action.

So, for example, in your navigation graph, you could have something like this:

  <fragment
    android:id="@+id/displayFragment"
    android:name="com.commonsware.jetpack.sampler.nav.DisplayFragment"
    android:label="Title: {title}" >
    <argument
      android:name="modelId"
      app:argType="string" />
    <argument
      android:name="title"
      app:argType="string" />
  </fragment>

Here, the android:label attribute for our <fragment> has an argument name wrapped in braces ({title} in "Title: {title}". The app bar's title will then be set to the value of the label, with {title} replaced by the value of the title argument.

If you need something more elaborate than that — for example, you want to look up the model by ID and read a property from it — you will need to use more manual approaches, such as those outlined in other answers to this question.

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