onPrepareOptionsMenu 有什么作用? [英] What does onPrepareOptionsMenu do?

问题描述

我想为Android制作Option Menu，我访问了这个网站.在他们的脚本中，我找到了 onPrepareOptionsMenu，我尝试使用带有和不带有 onPrepareOptionsMenu 的 Android 2.3.3 编译器编译和运行，两者都有效，但我没有看到任何区别.

I want to make Option Menu for Android, I have visit this site. In their script, I found onPrepareOptionsMenu, I try to compile and run using Android 2.3.3 compiler with and without onPrepareOptionsMenu, both works, but I didn't see any difference.

public boolean onCreateOptionsMenu(Menu menu){
    //code here
}
    
public boolean onOptionsItemSelected(MenuItem item){
    //code here
}
    
public boolean onPrepareOptionsMenu(Menu menu){
    //code here
}

onPrepareOptionsMenu 方法实际上是做什么的?这个方法重要吗?我可以删除该方法吗?

What is actually onPrepareOptionsMenu method do? Is that method important? Could I just delete the method?

添加

哦，我也听说过 Android 3.0 中的 Action Bar，它说 Action Bar 是 make Option Menu 的替代方式，它使用 onPrepareOptionsMenu.是吗?

Oh, I also hear about Action Bar in Android 3.0, it says that Action Bar is the alternative way for make Option Menu, and it using onPrepareOptionsMenu. Is that right?

谢谢...

推荐答案

查看API:

准备要显示的屏幕的标准选项菜单.这在菜单显示之前调用，每次显示.您可以使用此方法有效地启用/禁用项目或以其他方式动态修改内容.

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.

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