To avoid the appearance of an empty window before the splash screen

Add the style to the styles.xml

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<style name="SplashTheme" parent="Theme.AppCompat">
    <item name="windowNoTitle">true</item>
    <item name="android:windowDisablePreview">true</item>
    <item name="android:windowBackground">@drawable/splash_screen</item>
</style>

Add the style to the SplashActivity in AndroidManifest.xml

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<activity
    android:name=".activity.SplashActivity"
    android:theme="@style/SplashTheme">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

Sample SplashActivity

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class SplashActivity : AppCompatActivity() {

    var handler: Handler?=null
    lateinit var runnable: Runnable
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_splash)

        val intent = getIntent()
        if (!isTaskRoot()
            && intent != null
            && intent.hasCategory(Intent.CATEGORY_LAUNCHER)
            && intent.getAction() != null
            && intent.getAction().equals(Intent.ACTION_MAIN)
        ) {
            finish()
            return
        }

        window.navigationBarColor = ContextCompat.getColor(this, R.color.splash_bottom)
        window.statusBarColor = ContextCompat.getColor(this, R.color.main_red)

        handler = Handler(mainLooper)
        runnable = Runnable{
            val mIntent = Intent(this@SplashActivity, MainActivity::class.java)
            startActivity(mIntent)
            finish()
            handler = null
        }
        handler?.postDelayed(runnable, 1000) //millis
    }
}