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Android Reference

ActivityCompat


android.support.v4.app

Class ActivityCompat



  • public class ActivityCompat
    extends ContextCompat
    Helper for accessing features in Activity introduced after API level 4 in a backwards compatible fashion.
    • Constructor Detail

      • ActivityCompat

        public ActivityCompat()
    • Method Detail

      • invalidateOptionsMenu

        public static boolean invalidateOptionsMenu(Activity activity)
        Invalidate the activity's options menu, if able.

        Before API level 11 (Android 3.0/Honeycomb) the lifecycle of the options menu was controlled primarily by the user's operation of the hardware menu key. When the user presses down on the menu key for the first time the menu was created and prepared by calls to Activity.onCreateOptionsMenu(android.view.Menu) and Activity.onPrepareOptionsMenu(android.view.Menu) respectively. Subsequent presses of the menu key kept the existing instance of the Menu itself and called Activity.onPrepareOptionsMenu(android.view.Menu) to give the activity an opportunity to contextually alter the menu before the menu panel was shown.

        In Android 3.0+ the Action Bar forces the options menu to be built early so that items chosen to show as actions may be displayed when the activity first becomes visible. The Activity method invalidateOptionsMenu forces the entire menu to be destroyed and recreated from Activity.onCreateOptionsMenu(android.view.Menu), offering a similar though heavier-weight opportunity to change the menu's contents. Normally this functionality is used to support a changing configuration of Fragments.

        Applications may use this support helper to signal a significant change in activity state that should cause the options menu to be rebuilt. If the app is running on an older platform version that does not support menu invalidation the app will still receive Activity.onPrepareOptionsMenu(android.view.Menu) the next time the user presses the menu key and this method will return false. If this method returns true the options menu was successfully invalidated.

        Parameters:
        activity - Invalidate the options menu of this activity
        Returns:
        true if this operation was supported and it completed; false if it was not available.


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