Making, Building and Signing Android Application Package

Is it possible to Make, Build and Signing my own Android Application Package (APK)? I'm kinda interested in to learn Making Android App with Java, but because i don't have PC/Laptop to install Android Studio, it just difficult for that, why i didn't just use X11? the performance will be horrible, because my phone are just to Potato, i know there's package called apksigner, dx, ecj, openjdk-21 (which i already installed), aapt etc, but i have no idea how to use it.
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