StrongService/as/app/src/main/res/values/styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="AppTheme.Daemon">
        <!--设置背景透明-->
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowIsTranslucent">true</item>
        <!--设置窗口框架为空-->
        <item name="android:windowFrame">@null</item>
        <!--设置没有 title-->
        <item name="android:windowNoTitle">true</item>
        <!--设置浮动-->
        <item name="android:windowIsFloating">true</item>
        <!--窗口动画为空-->
        <item name="android:windowAnimationStyle">@null</item>
        <!--不可预览-->
        <item name="android:windowDisablePreview">true</item>
        <item name="android:windowNoDisplay">false</item>
    </style>

</resources>