Manage toolbar s navigation and back button from fragment in android

Question

All of my fragments are controlled through ActionBarActivity  mainActivity   inside mainActivity a DrawerLayout is implemented and all the child fragments are pushed through drawerLayout s list item click  The problem that I m facing is after pushing a fragment through drawerLayout I want to change the drawer icon into back icon of ToolBar so that user can navigate to previous fragment and to handle the callback of android R id home either inside the same fragment or inside the mainActivity   The code that I am using is   MainActivity java  public class MainActivity extends ActionBarActivity       private DrawerLayout layoutDrawer      private ActionBarDrawerToggle drawerToggler      private Stack lt Fragment gt  stack        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            Toolbar toolbar    Toolbar  findViewById R id toolbar           setSupportActionBar toolbar           stack   new Stack lt Fragment gt             layoutDrawer    DrawerLayout  findViewById R id layout drawer           drawerToggler   new ActionBarDrawerToggle this  layoutDrawer  toolbar                  R string app name  R string app name           layoutDrawer setDrawerListener drawerToggler            setUpDrawerList            pushFragment new FirstFragment    true            Session setContext getApplicationContext                 Override     public boolean onCreateOptionsMenu Menu menu            getMenuInflater   inflate R menu main  menu           return true              Override     public boolean onOptionsItemSelected MenuItem item            if  drawerToggler isDrawerIndicatorEnabled                    amp  amp  drawerToggler onOptionsItemSelected item               return true          switch  item getItemId              case android R id home              Toast makeText this   Back from activity   Toast LENGTH SHORT                       show                return true                    return super onOptionsItemSelected item               Override     protected void onPostCreate Bundle savedInstanceState            super onPostCreate savedInstanceState           drawerToggler syncState                Override     public void onBackPressed             popFragment               private void setUpDrawerList             ListView listView    ListView  findViewById R id list drawer           ArrayAdapter lt String gt  adapter   new ArrayAdapter lt String gt  this                  android R layout simple list item 1                  Arrays asList new String      First Fragment                            Second Fragment               listView setAdapter adapter           listView setOnItemClickListener new AdapterView OnItemClickListener                   Override             public void onItemClick AdapterView lt   gt  parent  View view                      int position  long id                    layoutDrawer closeDrawers                    drawerToggler setDrawerIndicatorEnabled false                   getSupportActionBar   setDisplayHomeAsUpEnabled true                   pushFragment getFragment position   true                                        private Fragment getFragment int pos            switch  pos            case 0              return new FirstFragment            case 1              return new SecondFragment                      return null             public void pushFragment Fragment fragment  boolean add            FragmentTransaction transation   getSupportFragmentManager                    beginTransaction            if  add              stack push fragment           transation replace R id layout content  fragment           transation commit               public void popFragment             if   stack isEmpty                  Fragment fragment   stack elementAt stack size   - 2               stack pop                pushFragment fragment  false             else             super onBackPressed            drawerToggler setDrawerIndicatorEnabled stack size      1              public void clearBackStack             stack clear              FirstFragment java  public class FirstFragment extends Fragment         Override     public void onActivityCreated Bundle savedInstanceState            super onActivityCreated savedInstanceState           setHasOptionsMenu true               Override     public View onCreateView LayoutInflater inflater  ViewGroup container              Bundle savedInstanceState            return inflater inflate R layout fragment first  container  false               Override     public void onResume             super onResume            ActionBar actionBar     ActionBarActivity getActivity    getSupportActionBar            actionBar setTitle  First Fragment            actionBar setDisplayHomeAsUpEnabled true           actionBar setHomeButtonEnabled true               Override     public void onCreateOptionsMenu Menu menu  MenuInflater inflater            super onCreateOptionsMenu menu  inflater           menu clear            inflater inflate R menu fragment menu  menu               Override     public boolean onOptionsItemSelected MenuItem item            switch item getItemId              case android R id home              Toast makeText getActivity     Back from fragment   Toast LENGTH SHORT  show                getActivity   onBackPressed                return true                    return super onOptionsItemSelected item             From the above code I am not able to get the callback of android R id home and setting home button is not working everytime actionBar setDisplayHomeAsUpEnabled true   actionBar setHomeButtonEnabled true    Any help will be really appreciated   Thanks

User · Answer

Probably the cleanest solution   abstract class NavigationChildFragment   Fragment          abstract fun onCreateChildView inflater  LayoutInflater                                     container  ViewGroup                                      savedInstanceState  Bundle    View       override fun onCreateView inflater  LayoutInflater                                container  ViewGroup                                 savedInstanceState  Bundle    View            val activity   activity as  MainActivity         activity  supportActionBar  setDisplayHomeAsUpEnabled true          setHasOptionsMenu true          return onCreateChildView inflater  container  savedInstanceState             override fun onDestroyView             val activity   activity as  MainActivity         activity  supportActionBar  setDisplayHomeAsUpEnabled false          setHasOptionsMenu false          super onDestroyView              override fun onOptionsItemSelected item  MenuItem   Boolean           val activity   activity as  MainActivity         return when  item itemId                android R id home - gt                    activity  onBackPressed                   true                           else              - gt  super onOptionsItemSelected item                      Just use this class as parent for all Fragments that should support navigation

User · Answer

OnToolBar there is a navigation icon at left side  Toolbar  toolbar    Toolbar  findViewById R id tool bar           toolbar setTitle getResources   getString R string title activity select event            setSupportActionBar toolbar            getSupportActionBar   setDisplayShowHomeEnabled true           getSupportActionBar   setDisplayHomeAsUpEnabled true     By using this at left side navigation icon appear and on navigation icon click it call parent activity    and in manifest we can notify system about parent activity      lt activity             android name   CategoryCloudSelectActivity              android parentActivityName   EventSelectionActivity              android screenOrientation  portrait    gt

User · Answer

Kotlin  In the activity hosting the fragment s       override fun onOptionsItemSelected item  MenuItem   Boolean       when  item itemId            android R id home - gt                onBackPressed               return true                     return super onOptionsItemSelected item     I have found that when I add fragments to a project  they show the action bar home button by default  to remove disable it put this in onViewCreated    use true to enable it if it is not showing   val actionBar   this requireActivity   actionBar     actionBar  setDisplayHomeAsUpEnabled false

User · Answer

First you add the Navigation back button     getSupportActionBar   setDisplayHomeAsUpEnabled true       getSupportActionBar   setDisplayShowHomeEnabled true     Then  add the Method in your HostActivity     Override public boolean onOptionsItemSelected MenuItem item        if  item getItemId    android R id home                super onBackPressed            Toast makeText this   OnBAckPressed Works   Toast LENGTH SHORT  show               return super onOptionsItemSelected item       Try this  definitely work

User · Answer

The easiest solution I found was to simply put that in your fragment    androidx appcompat widget Toolbar toolbar   getActivity   findViewById R id toolbar       toolbar setNavigationOnClickListener new View OnClickListener              Override         public void onClick View v                NavController navController   Navigation findNavController getActivity     R id nav host fragment               navController navigate R id action position to destination                       Personnaly I wanted to go to another page but of course you can replace the 2 lines in the onClick method by the action you want to perform

User · Answer

I have head around lots of solutions and none of them works perfectly  I ve used variation of solutions available in my project which is here as below  Please use this code inside class where you are initialising toolbar and drawer layout   getSupportFragmentManager   addOnBackStackChangedListener new FragmentManager OnBackStackChangedListener              Override         public void onBackStackChanged                 if  getSupportFragmentManager   getBackStackEntryCount    gt  0                    drawerFragment mDrawerToggle setDrawerIndicatorEnabled false                   getSupportActionBar   setDisplayHomeAsUpEnabled true     show back button                 toolbar setNavigationOnClickListener new View OnClickListener                          Override                     public void onClick View v                            onBackPressed                                                            else                     show hamburger                 drawerFragment mDrawerToggle setDrawerIndicatorEnabled true                   getSupportActionBar   setDisplayHomeAsUpEnabled false                   drawerFragment mDrawerToggle syncState                    toolbar setNavigationOnClickListener new View OnClickListener                          Override                     public void onClick View v                            drawerFragment mDrawerLayout openDrawer GravityCompat START

User · Answer

You have to manage your back button pressed action on your main Activity because your main Activity is container for your fragment    First  add your all fragment to transaction addToBackStack null  and now navigation back button call will be going on main activity  I hope following code will help you      Override     public boolean onOptionsItemSelected MenuItem item        switch  item getItemId          case android R id home          onBackPressed                  return super onOptionsItemSelected item       you can also use   Fragment fragment  fragmentManager findFragmentByTag Constant TAG    if fragment  null                    FragmentTransaction transaction   fragmentManager beginTransaction          transaction remove fragment  commit        And to change the title according to fragment name from fragment you can use the following code   activity getSupportActionBar   setTitle  Keyword Report Detail

User · Answer

Add a toolbar to your xml   lt android support v7 widget Toolbar     android id    id toolbar      android layout width  match parent      android layout height   attr actionBarSize      android background   attr colorPrimary      android theme   style ThemeOverlay AppCompat ActionBar      app popupTheme   style ThemeOverlay AppCompat Light  gt        lt TextView         android layout width  wrap content          android layout height  wrap content          android text  Fragment title   gt    lt  android support v7 widget Toolbar gt    Then inside your onCreateView method in the Fragment   Toolbar toolbar   view findViewById R id toolbar   toolbar setNavigationIcon R drawable ic back button   toolbar setNavigationOnClickListener new View OnClickListener          Override     public void onClick View v             getActivity   onBackPressed

User · Answer

You can use Toolbar inside the fragment and it is easy to handle  First add Toolbar to layout of the fragment   lt android support v7 widget Toolbar     xmlns android  http   schemas android com apk res android      xmlns app  http   schemas android com apk res-auto      android id    id toolbar      android layout height  wrap content      android layout width  match parent      android fitsSystemWindows  true      android minHeight   attr actionBarSize      app theme   style ThemeOverlay AppCompat Dark ActionBar      android background   attr colorPrimaryDark  gt   lt  android support v7 widget Toolbar gt    Inside the onCreateView Method in the fragment you can handle the toolbar like this    Toolbar toolbar    Toolbar  view findViewById R id toolbar    toolbar setTitle  Title     toolbar setNavigationIcon R drawable ic arrow back     IT will set the toolbar title and the back arrow navigation to toolbar You can set any icon to setNavigationIcon method   If you need to trigger any event when click toolbar navigation icon you can use this    toolbar setNavigationOnClickListener new View OnClickListener              Override         public void onClick View v                 handle any click event           If your activity have navigation drawer you may need to open that when click the navigation back button  you can open that drawer like this    toolbar setNavigationOnClickListener new View OnClickListener              Override         public void onClick View v                DrawerLayout drawer    DrawerLayout  getActivity   findViewById R id drawer layout               drawer openDrawer Gravity START                       Full code is here   public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState          inflate the layout to the fragement     view   inflater inflate R layout layout user container false          initialize the toolbar     Toolbar toolbar    Toolbar  view findViewById R id toolbar       toolbar setTitle  Title        toolbar setNavigationIcon R drawable ic arrow back       toolbar setNavigationOnClickListener new View OnClickListener              Override         public void onClick View v                  open navigation drawer when click navigation back button             DrawerLayout drawer    DrawerLayout  getActivity   findViewById R id drawer layout               drawer openDrawer Gravity START                         return view

[android] Manage toolbar's navigation and back button from fragment in android

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[android] Manage toolbar's navigation and back button from fragment in android

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