Android: Inflate menu (add items to action bar) only on click of a button

问题

I am trying to inflate a menu only onclick of a button in android. How do i achieve it without creating it automatically by calling onCreateOptionsMenu. I want the menu to appear only after button is click.

回答1:

First add this icon in you action R.menu... file and set the visibility as false.

Have a boolean instance variable in our java file.

private boolean isTickVisible = false;

Then you need to override OnPrepareOptions menu like below and set the visibility of the tick menu.

 @Override
    public void onPrepareOptionsMenu(Menu menu) {
        super.onPrepareOptionsMenu(menu);

        MenuItem someMenuItem = menu.findItem(R.id.tick_menu_item);
        someMenuItem.setVisible(isTickVisible);
    }

Finally onClick event of your button do the following :

isTickVisible = true;
invalidateOptionsMenu(); //this will redraw your menu.

回答2:

I fixed this issue by setting the visibility.Inflate the layout and make it visible only on clicking the button.Add a flag inside onClickListener eg:Hide=true;

@Override
 public boolean onCreateOptionsMenu(Menu menu) {
 getMenuInflater().inflate(R.menu.menu_search, menu);

for (int i = 0; i < menu.size(); i++)
       if(Hide){
            menu.getItem(i).setVisible(true);
            }
}

来源：https://stackoverflow.com/questions/37807538/android-inflate-menu-add-items-to-action-bar-only-on-click-of-a-button