MenuItem 的选中状态未通过其图标正确显示 [英] MenuItem's checked state is not shown correctly by its icon

问题描述

我以这种方式定义了 MenuItem:

I have MenuItem defined this way:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/menu_starred"
        android:icon="@drawable/btn_star"
        android:title="@string/description_star"
        android:checkable="true"
        android:checked="true"
        android:orderInCategory="1"
        android:showAsAction="always" />
</menu>

和btn_star.xml是这样定义的:

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item 
        android:state_checked="false" 
        android:drawable="@drawable/btn_star_off_normal" />
    <item 
        android:state_checked="true"
        android:drawable="@drawable/btn_star_on_normal" />
</selector>

然而，当我使用它创建选项菜单时，即使 MenuItem 的 isChecked() 属性为真，图标也永远不会显示为选中状态.

When I create an options menu using this, however, the icon is never shown in its checked state, even if the MenuItem's isChecked() property is true.

我正在使用 ActionBarSherlock 控件，但是，如果我只是创建一个普通选项，我会得到相同的结果菜单并调用 setChecked(true).无论项目的选中状态如何，它仍然显示 btn_star_off drawable.

I'm using the ActionBarSherlock control, however, I'm getting the same result if I simply create a normal options menu and call setChecked(true). It still displays the btn_star_off drawable regardless of the checked state of the item.

onOptionsItemSelected() 方法被正确调用，我可以成功更改checked 属性:

The onOptionsItemSelected() method is being called correctly, and I can successfully change the checked property:

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if(item.isCheckable()) {
            item.setChecked(!item.isChecked());
        }
        return super.onOptionsItemSelected(item);
}

在此处设置断点显示 isChecked 属性正在更改，但图标本身并未更新以反映正确的状态.

Setting a breakpoint here shows the isChecked property being changed, but the icon itself is not updated to reflect the correct state.

我在这里遗漏了什么吗?我这样做不正确吗?我不明白为什么这不能正常工作.

Is there something I'm missing here? Am I doing this incorrectly? I can't figure out why this wouldn't be working correctly.

推荐答案

根据官方文档 http://developer.android.com/guide/topics/ui/menus.html

注意:图标菜单(来自选项菜单)中的菜单项不能显示复选框或单选按钮.如果您选择在图标菜单可检查，您必须手动指示选中状态每次状态改变时交换图标和/或文本.

Note: Menu items in the Icon Menu (from the Options Menu) cannot display a checkbox or radio button. If you choose to make items in the Icon Menu checkable, you must manually indicate the checked state by swapping the icon and/or text each time the state changes.

希望有帮助.

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