Add this line to build.gradle.kts(Module::App)

    // Splash screen
    implementation("androidx.core:core-splashscreen:1.0.0")

Add this code to MainActivity.kts

        // 스플래시 스크린 딜레이 시작
        var keepSplashOnScreen = true
        val delay = 1500L
 
        installSplashScreen().setKeepOnScreenCondition { keepSplashOnScreen }
        Handler(Looper.getMainLooper()).postDelayed({ keepSplashOnScreen = false }, delay)
        // 스플래시 스크린 딜레이 끝.

themes.xml is like this

"themes.xml"

<?xml version="1.0" encoding="utf-8"?>
<resources>
 
    <style name="Theme.Memorize.MySplash" parent="Theme.SplashScreen">
        <item name="windowSplashScreenAnimatedIcon">@drawable/seodanggae_launcher_foreground</item>
        <item name="postSplashScreenTheme">@style/Theme.Memorize</item>
    </style>
    <style name="Theme.Memorize" parent="android:Theme.Material.Light.NoActionBar" />
</resources>