android 闪屏页面启动缓冲背景透明 或者纯色加logo

<application
        android:name=".App"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:logo="@mipmap/ic_launcher"
        android:theme="@style/OpeningTheme"

<style name="OpeningTheme" parent="Theme.AppCompat.NoActionBar">
        <item name="colorPrimary">@android:color/transparent</item>
        <item name="colorPrimaryDark">@android:color/transparent</item>
        <item name="colorAccent">@android:color/transparent</item>

        <item name="android:windowBackground">@drawable/splash_background</item>
    </style>

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

<!--    <item-->
<!--        android:drawable="@color/light_youtube_primary_color"/>    -->
    <item
        android:drawable="@color/transparent_background_color"/>

    <item
        android:width="80dp"
        android:height="80dp"
        android:gravity="center"
        android:drawable="@drawable/ic_launcher"/>
</layer-list>

其中

<!--    <item-->
<!--        android:drawable="@color/light_youtube_primary_color"/>    -->
    <item
        android:drawable="@color/transparent_background_color"/>

就决定了颜色