how to use setSupportActionBar in fragment

Question

I need to use the setSupportActionBar in fragment which I am unable to also I am unable to use setContentView please to help with it also Thankyou in advance the related code is given

public class StudentrFragment extends Fragment {         Toolbar toolbar;         TabLayout tabLayout;         ViewPager viewPager;         ViewPagerAdapter viewPagerAdapter;           public StudentrFragment() {             // Required empty public constructor         }           @Override         public void onCreate(Bundle savedInstanceState){             super.onCreate(savedInstanceState);             setContentView(R.layout.tabbar_layout);             toolbar = (Toolbar) findViewById(R.id.toolbar);             setSupportActionBar(toolbar);              tabLayout = (TabLayout) findViewById(R.id.tabLayout);             viewPager = (ViewPager) findViewById(R.id.viewPager);             viewPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());             viewPagerAdapter.addFragments(new CivilFragment(),"Civil Dept");             viewPagerAdapter.addFragments(new ComputerFragment(),"CSE Dept");             viewPagerAdapter.addFragments(new EeeFragment(),"EEE Dept");             viewPagerAdapter.addFragments(new EceFragment(),"ECE Dept");             viewPager.setAdapter(viewPagerAdapter);             tabLayout.setupWithViewPager(viewPager);          }      } 

Answer 1

You can setSupportActionbar like this in fragments:

((AppCompatActivity)getActivity()).setSupportActionBar(mToolbar); 

You need to inflate tabbar_layout in onCreateView of Fragment. Like this:

@Override public View onCreateView(LayoutInflater inflater, ViewGroup container,     Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.tabbar_layout, container, false);  //YOUR STUFF return rootView; } 

Answer 2

The suggested solution works, but it doesn't look elegant, ideally a fragment shouldn't know anything about its parent activity. An alternative might be not to use setSupportActionBar at all. If you use navigation library it might be easier to add a Toolbar to the fragment layout and setup it using NavigationUI, for example:

<!-- my_fragment.xml --> <androidx.constraintlayout.widget.ConstraintLayout ... >    <com.google.android.material.appbar.MaterialToolbar     android:id="@+id/toolbar"     app:menu="@menu/my_fragment_menu"     ... />  </androidx.constraintlayout.widget.ConstraintLayout> 

class MyFragment : Fragment() {   ...    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {     super.onViewCreated(view, savedInstanceState)      val navController = findNavController()     binding.toolbar.setupWithNavController(navController)      binding.toolbar.setOnMenuItemClickListener {       when (it.itemId) {         // these ids should match the item ids from my_fragment_menu.xml file         R.id.edit -> {           Log.i("MyFragment", "edit menu item is clicked")            // by returning 'true' we're saying that the event            // is handled and it shouldn't be propagated further           true         }         else -> false       }     }      // if you prefer not to use xml menu file      // you can also add menu items programmatically     val shareMenuItem = binding.toolbar.menu.add(R.string.share)     shareMenuItem.setOnMenuItemClickListener {       Log.i("MyFragment", "share menu item is clicked")       true     }   } } 

You can find the full GitHub example here. Also take a look at another question Is setSupportActionbar required anymore? and my answer for more details.