Layout for a basic Android App. Repo: https://github.com/ajinasokan/smallest-android-app-from-scratch Read: https://apkchef.net/build-smallest-android-app/

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Hello World"/>

</LinearLayout>