Trying to hide and show menu items on action bar

Question

I have looked through the questions on stack overflow and can\'t find the solution.

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    MenuInflater i         


        

Answer 1

Its not enough to change the isDown variable. You have to call the setVisible() method every time you want to change the visibility. That method does more than just setting a boolean value, so just changing a boolean value will not do.

After changing the isDown value to false, you need to call invalidateOptionsMenu() which will re-launch the menu by calling onPrepareOptionsMenu() again.

Try this code for making the menu items unvisible:

...
isdown = false;
invalidateOptionsMenu();
...

Answer 2

Try this in your FragmentActivity

public boolean onPreparePanel(int featureId, View view, Menu menu) {
    if(isLeftMenuOpened()) return false;
    return super.onPreparePanel(featureId, view, menu);
}

Method FragmentActivity.onPreparePanel creates menu for all attached fragments. You must return true for the menu to be displayed; if you return false it will not be shown.

Answer 3

Try this,

private Menu menu=null;
@Override
public void onCreateOptionsMenu(Menu menu,MenuInflater inflater)
{
    inflater.inflate(R.menu.note_menu, menu);
    this.menu=menu;
super.onCreateOptionsMenu(menu,inflater);
menu.findItem(R.id.menuChartNoteEdit).setVisible(isdown);
menu.findItem(R.id.menuChartOpenNote).setVisible(isdown);
}

When you want to hide menu at any where, after executing onCreateOptionsMenu() then just change value for isdown and repeat this code,

menu.findItem(R.id.menu_settings).setVisible(isdown);
menu.findItem(R.id.menu_save).setVisible(isdown);

Answer 4

I have a menu with two items, first: save item, second: edit item. I wanted when I came in to edit, at first "save item" had been hidden, and when I click "edit item", "save item" was shown.

So:

1. declare an item in public
2. set value to it in onCreateOptionsMenu(Menu menu, MenuInflater inflater)
3. set visibility to isHidden()
4. then every where I wanted, set visibility to isVisible()

Public region:

MenuItem saveItem;

onCreateOptionsMenu:

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.menu_detail_products, menu);
    saveItem = (MenuItem) menu.findItem(R.id.action_detail_product_save);
    saveItem.setVisible(isHidden());
}

Where i want:

saveItem.setVisible(isVisible());

Finally it works as I wanted.