今天遇到一个RadioButton不显示问题，我试了好几个手机都没问题，然后就让客户把关于手机的一些信息截屏给我，发现他是深色模式，后面我也把Android 10 以上的手机改成深色模式，发现也不显示，但是点击控件的位置还是能出来的选中的效果。

问题

Android Studio 4.1以上版本创建项目时默认有两个主题，但是两个使用的都是Theme.MaterialComponents.DayNight主题

    <style name="Theme.Test" parent="Theme.MaterialComponents.DayNight">
        <!-- Primary brand color. -->
        <item name="colorPrimary">@color/purple_500</item>
        <item name="colorPrimaryVariant">@color/purple_700</item>
        <item name="colorOnPrimary">@color/white</item>
        <!-- Secondary brand color. -->
        <item name="colorSecondary">@color/teal_200</item>
        <item name="colorSecondaryVariant">@color/teal_700</item>
        <item name="colorOnSecondary">@color/black</item>
        <!-- Status bar color. -->
        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
        <!-- Customize your theme here. -->
        <item name="android:windowFullscreen">true</item>
        <item name="android:colorAccent">@color/blue</item>
    </style>

但是这个主题有个问题想改一些控件的样式不好改，比如自定义Button设置了background一点作用都没。后面我把主题改成Theme.MaterialComponents.DayNight.NoActionBar.Bridge。

    <style name="Theme.Test" parent="Theme.MaterialComponents.DayNight.NoActionBar.Bridge">
        <!-- Primary brand color. -->
        <item name="colorPrimary">@color/purple_500</item>
        <item name="colorPrimaryVariant">@color/purple_700</item>
        <item name="colorOnPrimary">@color/white</item>
        <!-- Secondary brand color. -->
        <item name="colorSecondary">@color/teal_200</item>
        <item name="colorSecondaryVariant">@color/teal_700</item>
        <item name="colorOnSecondary">@color/black</item>
        <!-- Status bar color. -->
        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
        <!-- Customize your theme here. -->
        <item name="android:windowFullscreen">true</item>
        <item name="android:colorAccent">@color/blue</item>
    </style>

虽然这个主题能自定义样式，但是我的APP是没有做深色模式适配的，导致深色模式下一些原生主题控件不显示。

解决

最后把深色主题values-night-themes.xml改成Theme.MaterialComponents.Light.NoActionBar.Bridge。

    <style name="Theme.Test" parent="Theme.MaterialComponents.Light.NoActionBar.Bridge">
        <!-- Primary brand color. -->
        <item name="colorPrimary">@color/purple_200</item>
        <item name="colorPrimaryVariant">@color/purple_700</item>
        <item name="colorOnPrimary">@color/black</item>
        <!-- Secondary brand color. -->
        <item name="colorSecondary">@color/teal_200</item>
        <item name="colorSecondaryVariant">@color/teal_200</item>
        <item name="colorOnSecondary">@color/black</item>
        <!-- Status bar color. -->
        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
        <!-- Customize your theme here. -->
        <item name="android:windowFullscreen">true</item>
        <item name="android:colorAccent">@color/blue</item>
    </style>