如何通过Click事件以编程方式显示/隐藏操作栏项

By default I set the visibility to false by using following code.

默认情况下，我使用以下代码将可见性设置为false。

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_items, menu);
       menu.findItem(R.id.action_share).setVisible(false);
        return true;
    }

Now how can I make it visible again when user clicks a button in my activity.

现在，当用户点击我的活动中的按钮时，如何让它再次可见。

3 个解决方案

#1

In your onCreateOptionsMenu:

在你的onCreateOptionsMenu中：

public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_items, menu);
       if (hideIcon){
          menu.findItem(R.id.action_share).setVisible(false);
       }else{
          menu.findItem(R.id.action_share).setVisible(true);
       }
        return true;
    }

In method where you want to show/hide the icon, just set the boolean hideIcon to true or false and call :

在要显示/隐藏图标的方法中，只需将布尔值hideIcon设置为true或false，然后调用：

invalidateOptionsMenu();

to refresh the menu.

刷新菜单。

#2

get the instance of that menu item, and you can set its item Visibility every time.

获取该菜单项的实例，并且每次都可以设置其项目可见性。

        Menu mMenu;
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
           getMenuInflater().inflate(R.menu.menu_items, menu);
           mMenu = menu;
           mMenu.findItem(R.id.action_share).setVisible(false);
           return true;
        }

//somewhere else

mMenu.findItem(R.id.action_share).setVisible(true);

and based on @chol answer call invalidateOptionsMenu();

并基于@chol接听电话invalidateOptionsMenu（）;

#3

While you can create a class field

虽然您可以创建一个类字段

   private Menu menu;

and capture its value in onCreateOptionsMenu()

并在onCreateOptionsMenu（）中捕获其值

   this.menu = menu;

Then Write the code in clickListener

然后在clickListener中编写代码

   this.menu.findItem(R.id.action_share).setVisible(true);

#1