Set selected item in Android BottomNavigationView

Question

I am using the new android support design widget BottomNavigationView from the support library  How can I set the current selection from code  I realized  that the selection is changed back to the first item  after rotating the screen  Of course it would also help  if someone could tell me  how to  save  the current state of the BottomNavigationView in the onPause function and how to restore it in onResume   Thanks

User · Answer

Add android enabled  true  to BottomNavigationMenu Items   And then set bottomNavigationView setOnNavigationItemSelectedListener mListener  and  set it as selected by doing bottomNavigationView selectedItemId   R id your menu id

User · Answer

It is now possible since 25 3 0 version to call setSelectedItemId    o

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use           bottomNavigationView getMenu   getItem 0  setChecked true

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I hope this helps     Setting default selected menu item and fragment         bottomNavigationView setSelectedItemId R id action home           getSupportFragmentManager                    beginTransaction                    replace R id fragment container  new HomeFragment    commit      It is more of determining the default fragment loaded at the same time with the corresponding bottom navigation menu item  You can include the same in your OnResume callbacks

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This will probably be added in coming updates  But in the meantime  to accomplish this you can use reflection   Create a custom view extending from BottomNavigationView and access some of its fields   public class SelectableBottomNavigationView extends BottomNavigationView        public SelectableBottomNavigationView Context context            super context              public SelectableBottomNavigationView Context context  AttributeSet attrs            super context  attrs              public SelectableBottomNavigationView Context context  AttributeSet attrs  int defStyleAttr            super context  attrs  defStyleAttr              public void setSelected int index            try               Field f   BottomNavigationView class getDeclaredField  mMenuView                f setAccessible true               BottomNavigationMenuView menuView    BottomNavigationMenuView  f get this                try                   Method method   menuView getClass   getDeclaredMethod  activateNewButton   Integer TYPE                   method setAccessible true                   method invoke menuView  index                 catch  SecurityException   NoSuchMethodException   IllegalAccessException   InvocationTargetException e                    e printStackTrace                            catch  IllegalAccessException e                e printStackTrace              catch  NoSuchFieldException e                e printStackTrace                         And then use it in your xml layout file    lt com your app SelectableBottomNavigationView         android id    id bottom navigation          android layout width  match parent          android layout height  wrap content          app itemBackground   color primary          app itemIconTint   drawable nav item color state          app itemTextColor   drawable nav item color state          app menu   menu bottom navigation menu   gt

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Use this to set selected bottom navigation menu item by menu id  MenuItem item   mBottomNavView getMenu   findItem menu id   item setChecked true

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I you don t want to modify your code  If so  I recommended you to try BottomNavigationViewEx   You just need replace call a method setCurrentItem index   and getCurrentItem

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This method work for me  private fun selectBottomNavigationViewMenuItem bottomNavigationView   BottomNavigationView  IdRes menuItemId  Int                bottomNavigationView setOnNavigationItemSelectedListener null              bottomNavigationView selectedItemId   menuItemId             bottomNavigationView setOnNavigationItemSelectedListener this              Example   override fun onBackPressed             replaceFragment HomeFragment            selectBottomNavigationViewMenuItem navView  R id navigation home           private fun replaceFragment fragment  Fragment            val transaction  FragmentTransaction   supportFragmentManager beginTransaction           transaction replace R id frame container  fragment          transaction commit

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private void setSelectedItem int actionId        Menu menu   viewBottom getMenu        for  int i   0  size   menu size    i  lt  size  i              MenuItem menuItem   menu getItem i             MenuItemImpl  menuItem  setExclusiveCheckable false           menuItem setChecked menuItem getItemId      actionId             MenuItemImpl  menuItem  setExclusiveCheckable true             The only  minus  of the solution is using MenuItemImpl  which is  internal  to library  though public

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To programmatically click on the BottomNavigationBar item you need use   View view   bottomNavigationView findViewById R id menu action item   view performClick      This arranges all the items with their labels correctly

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bottomNavigationView setSelectedItemId R id action item1     where action item1 is menu item ID

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Seems to be fixed in SupportLibrary 25 1 0    Edit  It seems to be fixed  that the state of the selection is saved  when rotating the screen

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Just adding another way to perform a selection programatically - this is probably what was the intention in the first place or maybe this was added later on   Menu bottomNavigationMenu   myBottomNavigationMenu getMenu    bottomNavigationMenu performIdentifierAction selected menu item id  0     The performIdentifierAction takes a Menu item id and a flag   See the documentation for more info

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Reflection is bad idea    Head to this gist  There is a method that performs the selection but also invokes the callback      CallSuper     public void setSelectedItem int position            if  position  gt   getMenu   size      position  lt  0  return           View menuItemView   getMenuItemView position           if  menuItemView    null  return          MenuItemImpl itemData     MenuView ItemView  menuItemView  getItemData              itemData setChecked true            boolean previousHapticFeedbackEnabled   menuItemView isHapticFeedbackEnabled            menuItemView setSoundEffectsEnabled false           menuItemView setHapticFeedbackEnabled false     avoid hearing click sounds  disable haptic and restore settings later of that view         menuItemView performClick            menuItemView setHapticFeedbackEnabled previousHapticFeedbackEnabled           menuItemView setSoundEffectsEnabled true             mLastSelection   position

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IF YOU NEED TO DYNAMICALLY PASS FRAGMENT ARGUMENTS DO THIS  There are plenty of  mostly repeated or outdated  answers here but none of them handles a very common need  dynamically passing different arguments to the Fragment loaded into a tab   You can t dynamically pass different arguments to the loaded Fragment by using setSelectedItemId R id second tab   which ends up calling the static OnNavigationItemSelectedListener  To overcome this limitation I ve ended up doing this in my MainActivity that contains the tabs   fun loadArticleTab articleId  String        bottomNavigationView menu findItem R id tab article  isChecked   true    use setChecked   in Java     supportFragmentManager          beginTransaction            replace R id main fragment container  ArticleFragment newInstance articleId            commit       The ArticleFragment newInstance   method is implemented as usual   private const val ARG ARTICLE ID    ARG ARTICLE ID   class ArticleFragment   Fragment          companion object                           return An  ArticleFragment  that shows the article with the given ID                      fun newInstance articleId  String   ArticleFragment               val args   Bundle               args putString ARG ARTICLE ID  day              val fragment   ArticleFragment               fragment arguments   args             return fragment

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From API 25 3 0 it was introduced the method setSelectedItemId int id  which lets you mark an item as selected as if it was tapped  From docs   Set the selected menu item ID  This behaves the same as tapping on an item   Code example  BottomNavigationView bottomNavigationView  bottomNavigationView    BottomNavigationView  findViewById R id bottomNavigationView   bottomNavigationView setOnNavigationItemSelectedListener myNavigationItemListener   bottomNavigationView setSelectedItemId R id my menu item id    IMPORTANT You MUST have already added all items to the menu  in case you do this programmatically  and set the Listener before calling setSelectedItemId I believe you want the code in your listener to run when you call this method   If you call setSelectedItemId before adding the menu items and setting the listener nothing will happen

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Above API 25 you can use setSelectedItemId menu item id  but under API 25 you must do differently  user Menu to get handle and then setChecked to Checked specific item

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I made a bug to Google about the fact that there s no reliable way to select the page on a BottomNavigationView   https   code google com p android issues detail id 233697  NavigationView apparently had a similar issue  which they fixed by adding a new setCheckedItem   method

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Override protected void onCreate Bundle savedInstanceState      super onCreate savedInstanceState       bottomNavigationView setOnNavigationItemSelectedListener this      Menu menu   bottomNavigationView getMenu       this onNavigationItemSelected menu findItem R id action favorites

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You can try the performClick method   View view   bottomNavigationView findViewById R id YOUR ACTION   view performClick     Edit From API 25 3 0 it was introduced the method setSelectedItemId int id  which lets you mark an item as selected as if it was tapped

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For those  who still use SupportLibrary  lt  25 3 0  I m not sure whether this is a complete answer to this question  but my problem was very similar - I had to process back button press and bring user to previous tab where he was  So  maybe my solution will be useful for somebody   private void updateNavigationBarState int actionId       Menu menu   bottomNavigationView getMenu         for  int i   0  size   menu size    i  lt  size  i              MenuItem item   menu getItem i           item setChecked item getItemId      actionId             Please  keep in mind that if user press other navigation tab BottomNavigationView won t clear currently selected item  so you need to call this method in your onNavigationItemSelected after processing of navigation action    Override public boolean onNavigationItemSelected  NonNull MenuItem item        switch  item getItemId              case R id some id 1                 process action             break          case R id some id 2                 process action             break                      default              return false             updateNavigationBarState item getItemId          return true      Regarding the saving of instance state I think you could play with same action id of navigation view and find suitable solution

[android] Set selected item in Android BottomNavigationView

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