Frequent Question: What Is invalidateOptionsMenu in Android?
Contents invalidateOptionsMenu() Is Used to Say Android, That Contents of Menu Have Changed, and Menu Should Be Redrawn. for Example, You Click a Button Which...
invalidateOptionsMenu() is used to say Android, that contents of menu have changed, and menu should be redrawn. For example, you click a button which adds another menu item at runtime, or hides menu items group. In this case you should call invalidateOptionsMenu() , so that the system could redraw it on UI.
What is the role of return true or false from the callback method onCreateOptionsMenu?
Returns boolean You must return true for the menu to be displayed; if you return false it will not be shown.
Which is valid menu in Android?
For all menu types, Android provides a standard XML format to define menu items. Instead of building a menu in your activity’s code, you should define a menu and all its items in an XML menu resource. You can then inflate the menu resource (load it as a Menu object) in your activity or fragment.
James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.
