RadioGroup 选中的Button 属性

问题描述

我正在尝试在 Android 中构建 RadioGroup，默认情况下选中一个 RadioButton.我想知道这是否可以通过 XML 而不是以编程方式完成.

I am trying to build RadioGroup in Android with one RadioButton checked by default. I'm wondering if this is possible to do through XML, rather than programmatically.

以下代码片段似乎不起作用，因为我收到错误消息:

The following code snippet doesn't seem to work as I'm getting an error:

error: Error: No resource found that matches the given name (at 'checkedButton' with value '@id/rdb_positive')

代码是:

<RadioGroup
    style="@style/FormInputField"
    android:orientation="vertical"
    android:checkedButton="@id/rdb_positive"> <!-- Error on this line -->
    <RadioButton
        android:id="@+id/rdb_positive"
        android:text="@string/answer_positive" />
    <RadioButton
        android:id="@+id/rdb_negative"
        android:text="@string/answer_negative" />
</RadioGroup>

这在某种程度上确实有意义，因为 RadioButton 的 id 是在 RadioGroup 中的属性设置后定义的，但我想知道为什么有这样的属性可用.

It does make sense in a way, as the id of the RadioButton is defined after the attribute in the RadioGroup is set, but then I wonder why there is such attribute available.

推荐答案

使用 android:checkedButton="@+id/rdb_positive" ，我觉得你加了 + 符号那么它的作品

Use android:checkedButton="@+id/rdb_positive" ,i think you add + sign then its works

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