How to update a menu item shown in the ActionBar

Question

I have an Activity that has 2 fragments   Both are ListFragments and both contribute MenuItems to the Menu   I have one MenuItem that I ve set the attribute android showAsAction to have it show as a button on the ActionBar   Which works fine   Now the MenuItem is state dependent   It s a Pause Resume menu option for pausing and resuming a queue   My problem is I can t figure out how to set it s initial statue when the Fragment is created   It s state is dependent on the whether the queue is paused or not   So I have an AsyncTask that gets the queue and sets a boolean  paused  based on the state of the queue   I m calling onPrepareOptionsMenu to set the text for the Pause menu item based on the last known state of the queue and this works great if I leave the MenuItem in the actual menu   You tap the menu icon and onPrepareOptionsMenu is fired and the menu is updated before it s displayed     The problem is  if I put that same MenuItem on the ActionBar  showAsAction   how can I force it to update without having to call onPrepareOptionsMenu   I need to be able to do this because on first launch of the app  I send a request to get the queue  but the task returns after the ActionBar is setup and displayed   I ve created a handler in my fragment that gets called every time I get a queue update  but from there  how can I update the text for my MenuItem on the ActionBar   I can t seem to find a way to get the currently set Menu to manipulate it except for in onPrepareOptionMenu   Rob W

User · Answer

First please follow the two lines of codes to update the action bar items  before that you should set a condition in oncreateOptionMenu    For example   Boolean mISQuizItemSelected   false          Called to inflate the action bar menus        param menu         the menu        return true  if successful       Override public boolean onCreateOptionsMenu Menu menu            Inflate the menu items for use in the action bar      inflater inflate R menu menu demo  menu          condition to hide the menus     if  mISQuizItemSelected            for  int i   0  i  lt  menu size    i                  menu getItem i  setVisible false                        return super onCreateOptionsMenu menu             Called when the item on the action bar being selected         param item         menuitem being selected        return true if the menuitem id being selected is matched    false if none of the menuitems id are matched      Override public boolean onOptionsItemSelected MenuItem item        if  item getId      R id action quiz              to navigate based on the usertype either learner or leo         mISQuizItemSelected   true           ActionBar actionBar   getActionBar            invalidateOptionMenu

User · Answer

To refresh menu from Fragment simply call   getActivity   invalidateOptionsMenu

User · Answer

in my case  invalidateOptionsMenu just re-setted the text to the original one  but directly accessing the menu item and re-writing the desire text worked without problems   if  mnuTopMenuActionBar     null        MenuItem mnuPageIndex   mnuTopMenuActionBar           findItem R id menu magazin pageOfPage text        if  mnuPageIndex    null            if  getScreenOrientation      1                mnuPageIndex setTitle  i   1      von     pages                     else               mnuPageIndex setTitle                   i   1             i   2            von     pages                        invalidateOptionsMenu              due to the comment below  I was able to access the menu item via the following code    Override public boolean onCreateOptionsMenu Menu menu        MenuInflater inflater   getMenuInflater        inflater inflate R menu magazine swipe activity  menu       mnuTopMenuActionBar    menu      return true

User · Answer

I have used this code   public boolean onPrepareOptionsMenu  Menu menu               MenuInflater inflater   getMenuInflater        TextView title     TextView  findViewById R id title       menu getItem 0  setTitle          getString R string payFor          title getText   toString         menu getItem 1  setTitle getString R string payFor                return true              And worked like a charm to me you can find OnPrepareOptionsMenu here

User · Answer

In Kotlin 1 2 simply call   invalidateOptionsMenu     and the onCreateOptionsMenu function will be called again

User · Answer

Option  1  Try invalidateOptionsMenu    I don t know if this will force an immediate redraw of the action bar or not   Option  2  See if getActionView   returns anything for the affected MenuItem  It is possible that showAsAction simply automatically creates action views for you  If so  you can presumably enable disable that View      I can t seem to find a way to get the currently set Menu to manipulate it except for in onPrepareOptionMenu    You can hang onto the Menu object you were handed in onCreateOptionsMenu    Quoting the docs      You can safely hold on to menu  and any items created from it   making modifications to it as desired  until the next time onCreateOptionsMenu   is called

User · Answer

For clarity  I thought that a direct example of grabbing onto a resource can be shown from the following that I think contributes to the response for this question with a quick direct example   private MenuItem menuItem     Override public boolean onCreateOptionsMenu Menu menuF         MenuInflater inflater   getMenuInflater        inflater inflate R menu menu layout  menuF       menuItem    menuF findItem R id menu item identifier       return true      In this case you hold onto a MenuItem reference at the beginning and then change the state of it  for icon state changes for example  at a later given point in time

[android] How to update a menu item shown in the ActionBar?

Examples related to android

Examples related to menu

Examples related to android-fragments

Examples related to android-actionbar