Android 12 - Splash Screens 알아보기

<resources xmlns:tools="http://schemas.android.com/tools">
    <style name="Theme.SplashScreen" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
        ...

        <item name="android:windowSplashScreenBackground">#808080</item>
        <item name="android:windowSplashScreenAnimatedIcon">@drawable/ic_launcher_foreground</item>
        <item name="android:windowSplashScreenIconBackgroundColor">@color/black</item>
        <item name="android:windowSplashScreenBrandingImage">@drawable/branding</item>
    </style>
</resources>

class MainActivity : AppCompatActivity() {
    var isReady = false

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)


        thread(start=true) {
            for (i in 1..5) {
                Thread.sleep(1000)
            }
            isReady = true
        }

        // Set up an OnPreDrawListener to the root view.
        val content: View = findViewById(android.R.id.content)
        content.viewTreeObserver.addOnPreDrawListener(
            object : ViewTreeObserver.OnPreDrawListener {
                override fun onPreDraw(): Boolean {
                    // Check if the initial data is ready.
                    return if (isReady) {
                        // The content is ready; start drawing.
                        content.viewTreeObserver.removeOnPreDrawListener(this)
                        true
                    } else {
                        // The content is not ready; suspend.
                        false
                    }
                }
            }
        )

    }
}