An example project to show how to implement a simple splash screen
You start by creating a new activity called SplashActivity and define it as the Launcher Activity, then you set the SplashTheme in the activity definition in AndroidManifest.xml
<activity
android:name=".SplashActivity"
android:theme="@style/SplashTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
In res -> values -> styles.xml you create a new style with SplashTheme name and define an item called android:windowBackground that will be a drawable that you will create in the next step.
<style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
<item name="android:windowBackground">@drawable/background_splash</item>
</style>
In res -> drawable folder you will create a background_splash.xml with two layers, a white background and the launcher icon in the center. You can customize this xml file the way you want.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:drawable="@color/white"/>
<item>
<bitmap
android:gravity="center"
android:src="@drawable/ic_launcher"/>
</item>
</layer-list>