怎么动态对action bar中的items进行操作

如何动态对action bar中的items进行操作

/* Called whenever we call invalidateOptionsMenu() */

@Override

public boolean onPrepareOptionsMenu(Menu menu) {

// If thenav drawer is open, hide action items related to the content

// view

boolean drawerOpen =mDrawerLayout.isDrawerOpen(mDrawerList);

menu.findItem(R.id.action_websearch).setVisible(!drawerOpen);

Log.e(TAG,"onPrepareOptionsMenu");

/**

* 隐藏展示actionbar中的item

// if(!iconVisibleFlag)

// menu.findItem(R.id.action_contact_back).setVisible(true);

// else

// menu.findItem(R.id.action_contact_back).setVisible(false);

return super.onPrepareOptionsMenu(menu);

}

具体解释：

Prepare the Screen's standard options menu to be displayed. This is called right before the menu is shown, every time it is shown. You can use this method to efficiently enable/disable items or otherwise dynamically modify the contents.

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    menu.clear();
    if(isChangedStat) {
        menu.add(0, MENUITEM, 0, "True");
    } else {
        menu.add(0, MENUITEM, 0, "False");
    }
    return super.onPrepareOptionsMenu(menu);
}

Please note two points

1- If possible just enable or disable menu item or looks possible in your case can change the title of same menu will work because menu.clear(); may need over attention while handling

2- as per link provided by Atlos

On Android 2.3.x and lower, the system calls onPrepareOptionsMenu() each time the user opens the options menu (presses the Menu button).

On Android 3.0 and higher, the options menu is considered to always be open when menu items are presented in the action bar. When an event occurs and you want to perform a menu update, you must call invalidateOptionsMenu() to request that the system call onPrepareOptionsMenu().

怎么动态对action bar中的items进行操作

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