Themed launch screen on Android

Android-Launch-Screen.md

AndroidManifest.xml

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

LauncherActivity.kt

class LauncherActivity : AppCompatActivity() {

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

    // ...
  }

} 

splash.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" android:opacity="opaque">
  <!-- a solid background color -->
  <item android:drawable="@color/colorPrimary"/>

  <!-- with a 144dp wide app logo centered on top of the background -->
  <item>
    <bitmap android:src="@drawable/product_logo_144dp"
            android:gravity="center"/>
  </item>
</layer-list> 

styles.xml

<resources>
  <!-- normal AppTheme here -->
  <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- customize your theme here -->
  </style>

  <!-- LauncherActivity theme -->
  <style name="AppTheme.Launcher" parent="AppTheme">
    <item name="android:windowBackground">@drawable/splash</item>
  </style>
</resources>