Dynamically Updating Menu Items

By overriding your Activity's onPrepareOptionsMenu method you can modify a Menu based on an application's current state immediately before the Menu is displayed. This lets you dynamically disable/enable Menu Items, set visibility, and modify text.

To modify Menu Items dynamically you can either find a reference to them in the onCreateOptionsMenu method when they're created, or you can use the findItem method on the Menu object, as shown in Listing 4-27, where onPrepareOptionsMenu is overridden.

LISTING 4-27: Dynamic menu modification Available for download on ©Override

Wrox.com public boolean onPrepareOptionsMenu(Menu menu) { super.onPrepareOptionsMenu(menu);

MenuItem menuItem = menu.findItem(MENU_ITEM);

return true;

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Mobile Apps Made Easy

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