How to build as lightweight Android application as possible?

Question

Android

The Google Podcasts application weighs less than 100kb, but has all the functionality and even works online. How did they do it? How are such lightweight applications assembled? What are the ways to lighten apk?

Answer 1

Habré has articles on Android Go development.
This is such a version of Android for weak hardware - and does not allow too consuming software to work.
If you make it according to those recipes, it will be what you need.
What is developed for it will also work on regular Android.

Answer 2

array_map function and how it differs from map()

The fact that the first (array_map) is a php function, and the second is apparently invented or taken from another language.