我想通过创建一个单选按钮创建一个可选择的选中和未选中状态的自定义按钮。但是没有显示任何内容来代替按钮。
我的代码：

<RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="@+id/imageView10"
        app:layout_constraintTop_toBottomOf="@+id/titleTextView"
        android:layout_margin="15dp">

        <RadioButton
            style="@style/TitleTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="email"
            android:textSize="22sp"
            android:textIsSelectable="true"
            android:button="@drawable/radio_button_selectable"/>

        <RadioButton
            style="@style/TitleTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="anonymous"
            android:textSize="22sp"
            android:textIsSelectable="true"
            android:checked="true"
            android:button="@drawable/radio_button_selectable"/>
    </RadioGroup>

radio_button_selectable.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_checked="true" android:drawable="@drawable/radio_button_selected"/>
    <item android:state_checked="false" android:drawable="@drawable/radio_button_unselected"/>

</selector>

radio_button_selected.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <gradient
        android:endColor="#FFF95B"
        android:startColor="#FF930F" />
    <stroke
        android:width="2dp"
        android:color="@color/white" />
</shape>

radio_button_unselected.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="@android:color/darker_gray" />
    <stroke
        android:width="2dp"
        android:color="@color/white" />
</shape>

它看起来如何：
Screenshot of radio button