Problem summary (5)-menu refresh

In a recent project, the menu icon was required to be dynamically replaced. Finally, I checked the information and finally got it done:

First, the onCreateOptionsMenu function will only be executed once. If you create a menu, you can only display the initialized menu content and cannot change its value dynamically. During the test, we found that onPrepareOptionsMenu will be executed every time you click the menu key, so the problem is solved. The onPrepareOptionsMenu parameter is also the menu, so we try to add the menu item here (first block the menu in onCreateOptionsMenu) to verify whether it can meet our expectations. The result is acceptable.

Note: to create a menu in onPrepareOptionsMenu, you must first set menu. clear (); otherwise, more and more will be added.

 

Author: agods