以下是我目前的解决方案:
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:onCheckedChanged="@{(group, buttonId) -> student.setGenderIndex(group.indexOfChild(group.findViewById(buttonId)))}"
android:orientation="horizontal">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:checked="@{student.genderIndex == 0}"
android:text="Male" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="@{student.genderIndex == 1}"
android:text="Female" />
</RadioGroup>
这很好用,但我想知道是否有更好的方法来做到这一点。然后我发现RadioGroup
:android:checkedButton
(来自Official Documentation)有一个内置的双向属性,但是它是id
而不是我想要的索引:
public static final int checkedButton
The id of the child radio button that should be checked by default within this radio group.
May be an integer value, such as "100".
Constant Value: 16843080 (0x01010148)
我仍然尝试(使我的绑定表达式更短),但不起作用:
android:onCheckedChanged="@{(group, buttonId) -> student.setGenderIndex(group.indexOfChild(group.checkedButton))}"
"Could not find accessor android.widget.RadioGroup.checkedButton"
说
发布于 2021-10-11 12:56:42
像这样添加onCheckedChanged
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onCheckedChanged="@{vm.onSplitTypeChanged}">
<RadioButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/email" />
<RadioButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/sms" />
</RadioGroup>
然后在视图模型中实现onSplitTypeChanged
,如下所示
fun onSplitTypeChanged(radioGroup: RadioGroup?, id: Int) {
val checked = radioGroup?.findViewById<RadioButton>(id)
val index = radioGroup?.indexOfChild(checked)
}
https://stackoverflow.com/questions/64898737
复制相似问题