1、在styles.xml文件中配置：

<style name="WelcomePageStyle" parent="@style/Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowBackground">@mipmap/icon_welcome_bg</item>
    <item name="android:statusBarColor" tools:targetApi="l">@color/transparent</item>
    <item name="android:windowLightStatusBar" tools:targetApi="m">false</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowIsTranslucent">true</item>
</style>

2、在清单配置文件中配置WelcomeActivity

<activity
    android:name=".WelcomeActivity"
    android:exported="true"
    android:screenOrientation="landscape"
    android:theme="@style/WelcomePageStyle">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>