如何在 onCreateOptionsMenu() 之后在 Android 中添加 MenuItem

发布于 2024-11-25 15:40:46 字数 615 浏览 1 评论 0原文

我遇到了一个严重的问题。我想在用户成功登录后添加 MenuItem。

一开始我使用以下方法使其可用。

下面的代码现在不起作用，我提到它是为了说明我的想法。

Private Menu mymenu;
 public boolean onCreateOptionsMenu(Menu menu) {

        // TODO Auto-generated method stub

        super.onCreateOptionsMenu(menu);
        mymenu=menu;
        return super.onCreateOptionsMenu(menu);
 } 

public void process(){

        MenuInflater inflater=this.getMenuInflater();
        inflater.inflate(R.menu.my_menu,mymenu);

}

看来这个想法在我记忆中有效。但是在做了一些我不记得的事情之后，它不起作用！

调试后，我发现这是因为 mymenu=null 。

我猜有一种方法可以设置 mymenu=menu

有人可以帮忙吗？

原文

I've met a serious problem. I want to add the MenuItem after the user successfully logged in.

At the beginning I use the following method to make it available.

The following code doesn't work now , I mentioned it as to illustrate my idea.

Private Menu mymenu;
 public boolean onCreateOptionsMenu(Menu menu) {

        // TODO Auto-generated method stub

        super.onCreateOptionsMenu(menu);
        mymenu=menu;
        return super.onCreateOptionsMenu(menu);
 } 

public void process(){

        MenuInflater inflater=this.getMenuInflater();
        inflater.inflate(R.menu.my_menu,mymenu);

}

It seems this idea worked as I remembered.But after doing something I couldn't remember , It doesn't work!

After the debug , I find it's because mymenu=null .

I guessed there is a way to set mymenu=menu

Can anyone help?

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噩梦成真你也成魔 2024-12-02 15:40:46

该代码可能遇到的问题是调用 super 两次。

要执行您想要的操作，您可以重写 onPrepareOptionMenu 并将所有不需要的菜单项的可见性设置为隐藏，直到您的状态需要“添加”它。

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    MenuItem menuItem = menu.findItem(R.id.<id of menuitem>);
    menuItem.setVisible(<condition>);
    return true;
}

只需在 onCreateOptionsMenu 中使用标准代码：

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.<id of menu with all items you'll need>, menu);
    return true;
}

The problem you could be having with that code is calling the super twice.

To do what you want, you could override onPrepareOptionMenu and set the visibility to hidden on all menu items you don't want until your state is such that you want to "add" it.

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    MenuItem menuItem = menu.findItem(R.id.<id of menuitem>);
    menuItem.setVisible(<condition>);
    return true;
}

and just use standard code in onCreateOptionsMenu:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.<id of menu with all items you'll need>, menu);
    return true;
}

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