CODEWITHSUNDEEP
javaandroidmenu
Phil
Phil

Reputation: 583

Update Menu on start

I have a function which updates the menu. The problem is: this function should be called when application starts but in onCreate() it isn't possible because the menu wasn't create at this time so I get an exception. Is there any other possibility to call this MenuUpdate nearly at the start?

Upvotes: 1

Views: 363

Answers (3)

makovkastar
makovkastar

Reputation: 5020

Android activity has a method onPrepareOptionsMenu(Menu menu) in which you can access menu items. To initiate call to this function you must call invalidateOptionsMenu(). So the code to update menu in the activity's onCreate(...) method will look like:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    updateMenu();
} 

@Override
public void onPrepareOptionsMenu(Menu menu) {
    // Do update staff with menu instance
}

private void updateMenu() {
    invalidateOptionsMenu();
}

Upvotes: 0

Neoh
Neoh

Reputation: 16164

If your function needs to update menu, call 

supportInvalidateOptionsMenu();

in your activity class to refresh immediately.

Upvotes: 0

Yoann Hercouet
Yoann Hercouet

Reputation: 17976

You can use the function onCreateOptionsMenu, here is an example where some menu items are hidden during the creation:

@Override
public boolean onCreateOptionsMenu(Menu menu) {     
    getMenuInflater().inflate(R.menu.main_activity, (android.view.Menu) menu);
    this.menu = menu;
    showOption(R.id.menu_edit);
    hideOption(R.id.menu_check);
    hideOption(R.id.menu_cancel);

    return true;
}

Upvotes: 2

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