mattermost-mobile/assets/base/release/splash_screen/android/layout/launch_screen.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    android:gravity="center_horizontal"
    tools:context=".SplashScreenActivity">

    <ImageView
        android:id="@+id/imgLogo"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:adjustViewBounds="true"
        android:src="@drawable/splash" />

</androidx.constraintlayout.widget.ConstraintLayout>