Android:一项活动中有多个选项菜单 [英] Android: Multiple Option Menus in one Activity

问题描述

我有一个 Activity ，其中包含一个 ViewFlipper ，并且想为该 ViewFlipper 中的每个视图显示不同的选项菜单.也就是说，当按下菜单按钮时显示的菜单类型将取决于当前视图的类型.但是， onCreateOptionsMenu()仅被调用一次(第一次显示选项菜单时)，因此无法在此处实现创建不同的菜单.我该怎么解决?

I have an Activity containing a ViewFlipper and would like to show a different option menu for each view in that ViewFlipper. That is, the type of menu displayed when the menu button is pressed would depend on the type of the current view. However, onCreateOptionsMenu() is called only once (when showing the option menu for the first time), so creating the different menus can't be implemented there. How could I solve this?

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推荐答案

首先了解在用户进行的一项活动中，每次用户在其Android设备上按下 Menu 时，都会调用 onPrepareOptionsMenu 方法.第一次显示菜单时(即仅显示一次)，将调用 onCreateOptionsMenu 方法.

Each time the user presses the Menu on their Android device while inside one of your activities, the onPrepareOptionsMenu method is called. The first time the menu is shown (i.e. only once), the onCreateOptionsMenu method is called.

基本上，您应该在 onPrepareOptionsMenu 方法中进行任何更改，例如启用/禁用某些菜单项，或根据情况更改菜单项文本.

Basically, the onPrepareOptionsMenu method is where you should make any changes such as enabling/disabling certain menu items, or changing the menu item text depending on the circumstances.

这样做(不要使用 onCreateOptionsMenu(菜单菜单))

//Dynamically create context Menu
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        menu.clear(); //Clear view of previous menu
        MenuInflater inflater = getMenuInflater();
        if(condition_true)
            inflater.inflate(R.menu.menu_one, menu);
        else
            inflater.inflate(R.menu.menu_two, menu);
        return super.onPrepareOptionsMenu(menu);
    }

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