Android How to enable disable option menu item on button click

Question

I can easily do it when I am using onCreateOptionsMenu or onOptionsItemSelected methods   But I have a button somewhere in screen  and on clicking that button  it should enable disable context menu items

User · Answer

Override         public boolean onOptionsItemSelected MenuItem item                 switch  item getItemId                       case R id item id                            Your Code                              item setEnabled false                           break                              return super onOptionsItemSelected item

User · Answer

simplify  Vikas version    Override public boolean onPrepareOptionsMenu  Menu menu         menu findItem R id example foobar  setEnabled isFinalized       return true

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Override public boolean onCreateOptionsMenu Menu menu           Inflate the menu  this adds items to the action bar if it is present         getMenuInflater   inflate R menu home  menu       return false

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A more modern answer for an old question   MainActivity kt  private var myMenuIconEnabled by Delegates observable true       old  new - gt      if  new    old  invalidateOptionsMenu      override fun onCreate savedInstanceState  Bundle         super onCreate savedInstanceState      setContentView R layout activity main       findViewById lt Button gt  R id my button  setOnClickListener   myMenuIconEnabled   false      override fun onCreateOptionsMenu menu  Menu    Boolean       menuInflater inflate R menu menu main activity  menu      return super onCreateOptionsMenu menu     override fun onPrepareOptionsMenu menu  Menu   Boolean       menu findItem R id action my action  isEnabled   myMenuIconEnabled     return super onPrepareOptionsMenu menu      menu main activity xml   lt  xml version  1 0  encoding  utf-8   gt   lt menu xmlns android  http   schemas android com apk res android  xmlns app  http   schemas android com apk res-auto  gt   lt item     android id    id action my action      android icon   drawable ic my icon 24dp      app iconTint   drawable menu item icon selector      android title  My title      app showAsAction  always    gt   lt  menu gt    menu item icon selector xml   lt  xml version  1 0  encoding  utf-8   gt   lt selector xmlns android  http   schemas android com apk res android  gt   lt item android color   enabledMenuIconColor  android state enabled  true    gt   lt item android color   disabledMenuIconColor    gt      attrs xml   lt resources gt          lt attr name  enabledMenuIconColor  format  reference color   gt       lt attr name  disabledMenuIconColor  format  reference color   gt   lt  resources gt    styles xml or themes xml   lt style name  AppTheme  parent  Theme MaterialComponents Light NoActionBar  gt       lt  -- Customize your theme here  -- gt       lt item name  disabledMenuIconColor  gt  color white 30 alpha lt  item gt       lt item name  enabledMenuIconColor  gt  android color white lt  item gt

User · Answer

Anyway  the documentation covers all the things   Changing menu items at runtime     Once the activity is created  the   onCreateOptionsMenu   method is called   only once  as described above  The   system keeps and re-uses the Menu you   define in this method until your   activity is destroyed  If you want to   change the Options Menu any time after   it s first created  you must override   the onPrepareOptionsMenu   method    This passes you the Menu object as it   currently exists  This is useful if   you d like to remove  add  disable  or   enable menu items depending on the   current state of your application    E g     Override public boolean onPrepareOptionsMenu  Menu menu        if  isFinalized            menu getItem 1  setEnabled false              You can also use something like             menu findItem R id example foobar  setEnabled false             return true      On Android 3 0 and higher  the options menu is considered to always be open when menu items are presented in the action bar  When an event occurs and you want to perform a menu update  you must call invalidateOptionsMenu   to request that the system call onPrepareOptionsMenu

User · Answer

What I did was save a reference to the Menu at onCreateOptionsMenu   This is similar to nir s answer except instead of saving each individual item  I saved the entire menu     Declare a Menu Menu toolbarMenu    Then in onCreateOptionsMenusave the menu to your variable   Override public boolean onCreateOptionsMenu Menu menu        getMenuInflater   inflate R menu main menu  menu       toolbarMenu   menu      return true      Now you can access your menu and all of its items anytime you want  toolbarMenu getItem 0  setEnabled false

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How to update the current menu in order to enable or disable the items when an AsyncTask is done   In my use case I needed to disable my menu while my AsyncTask was loading data  then after loading all the data  I needed to enable all the menu again in order to let the user use it   This prevented the app to let users click on menu items while data was loading   First  I declare a state variable   if the variable is 0 the menu is shown  if that variable is 1 the menu is hidden   private mMenuState   1    I initialize it on 1 since I need all elements to be hidden when my activity starts loading    Then in my onCreateOptionsMenu   I check for this variable   if it s 1 I disable all my items  if not  I just show them all    Override     public boolean onCreateOptionsMenu Menu menu             getMenuInflater   inflate R menu menu galeria pictos  menu            if mMenuState  1               for  int i   0  i  lt  menu size    i                      menu getItem i  setVisible false                          else               for  int i   0  i  lt  menu size    i                      menu getItem i  setVisible true                                    return super onCreateOptionsMenu menu           Now  when my Activity starts  onCreateOptionsMenu   will be called just once  and all my items will be gone because I set up the state for them at the start   Then I create an AsyncTask Where I set that state variable to 0 in my onPostExecute     This step is very important   When you call invalidateOptionsMenu    it will relaunch onCreateOptionsMenu     So  after setting up my state to 0  I just redraw all the menu but this time with my variable on 0   that said  all the menu will be shown after all the asynchronous process is done  and then my user can use the menu    public class LoadMyGroups extends AsyncTask lt Void  Void  Void gt              Override         protected void onPreExecute                 super onPreExecute                mMenuState   1    you can set here the state of the menu too if you dont want to initialize it at global declaration                        Override         protected Void doInBackground Void    voids                 Background work              return null                      Override         protected void onPostExecute Void aVoid                super onPostExecute aVoid                mMenuState 0    We change the state and relaunch onCreateOptionsMenu             invalidateOptionsMenu      Relaunch onCreateOptionsMenu                    Results

User · Answer

You could save the item as a variable when creating the option menu and then change its properties at will   private MenuItem securedConnection  private MenuItem insecuredConnection    Override public boolean onCreateOptionsMenu Menu menu        MenuInflater inflater   getMenuInflater        inflater inflate R menu connect menu  menu       securedConnection   menu getItem 0       insecuredConnection    menu getItem 1       return true     public void foo           securedConnection setEnabled true

User · Answer

Generally can change the properties of your views in runtime    Button  item    Button  findViewById R id idBut     and then     item setVisibility false    but  if you want to modify de visibility of the options from the ContextMenu  on press your button  you can activate a flag  and then in onCreateContextMenu you can do something like this     Override         public void onCreateContextMenu ContextMenu menu                   View v ContextMenu ContextMenuInfo menuInfo                 super onCreateContextMenu menu  v  menuInfo                    menu setHeaderTitle R string context title                    if  flagIsOn                          addMenuItem menu   Option available   true                     else                       Toast makeText this   Option not available   500  show                                   I hope this helps

User · Answer

On all android versions  easiest way  use this to SHOW a menu action icon as disabled AND make it FUNCTION as disabled as well    Override public boolean onPrepareOptionsMenu Menu menu         MenuItem item   menu findItem R id menu my item        if  myItemShouldBeEnabled            item setEnabled true           item getIcon   setAlpha 255         else              disabled         item setEnabled false           item getIcon   setAlpha 130

User · Answer

the best solution when you are perform on navigation drawer   Override     public boolean onPrepareOptionsMenu Menu menu            menu setGroupVisible 0 false           return true

User · Answer

If visible menu  menu findItem R id id name  setVisible true     If hide menu  menu findItem R id id name  setVisible false

[android] Android: How to enable/disable option menu item on button click?

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