Report: My first "hello world" using Android Studio freeware on Windows worked just fine (in about an hour)

Report: My first "hello world" using Android Studio freeware on Windows
worked just fine (total elapsed time was about an hour).
http://www.bild.me/bild.php?file=7570013helloworld01.jpg
http://www.bild.me/bild.php?file=4072224helloworld02.jpg
http://www.bild.me/bild.php?file=7646977helloworld03.jpg
http://www.bild.me/bild.php?file=3369563helloworld04.jpg

The main issues to deal with a
o OEM USB Drivers for your phone (I had driver issues but surmounted them)
o Phone set to USB Debugging Mode (already a basic setup for most users)
o Android Studio (freeware, easily installed & seemingly powerful)
o Android SDK (Android Studio handles this well)
o Java (Android Studio handles this well, at least for Hello World)

Getting a "hello world" to work on an Android phone may sound like an
accomplishment, but it's not really that much since all you do is punch
buttons, given that the Google Android Studio freeware literally writes the
entire app for you.
https://developer.android.com/studio/

What takes the hour elapsed time is that Android Studio downloads a
separate SDK, and a few other things, plus there was, in my case, a minor
hardware emulation issue on my old desktop, and a USB debugging issue
(perhaps because I've been playing a lot with my USB MTP drivers lately).
https://groups.google.com/forum/#!topic/comp.mobile.android/SHR2YmpfVwo

The installation of Android Studio takes about an hour to download stuff:
https://developer.android.com/studio/install

You want to plan ahead to decide where you want to put things though:
o Studio: c:\app\hardware\android\studio\
o SDK: c:\app\hardware\android\sdk\
o Projects: c:\tmp\android\projects\myfirstapp\
o c:\users\you\.android\ (I'm not sure why stuff was put here)
o c:\users\you\.AndroidStudio3.2\ (I'm not sure why stuff is here)
etc.

My main noob mistake was to keep this default, which I should have removed:
[x]Performance Intel HAXM
Hardware-assisted virtual engine to speed up Android app emulation

Another noob mistake I made was that I had to re-install the original
OEM (LG Stylo 3 Plus) USB drivers before Android Studio could see it:
https://developer.android.com/studio/run/oem-usb#Drivers

Even though Windows had no problem seeing the phone over USB, Android
Studio didn't see the phone until I installed the OEM LG drivers from
https://developer.android.com/studio/run/oem-usb#Drivers

Specifically the LG TP450 driver for the $130 LG Stylo 3 Plus:
https://www.lg.com/us/support/software-firmware-drivers?search=lg+tpe450#=

Then all you do is follow their step by step tutorial which just works:
https://developer.android.com/training/basics/firstapp/

This is my first (baby) step to writing simple Android/iOS apps that a
o Forever free
o No ads
o No servers
o No spyware
o Simple user interface to do a given simple job the simplest way possible
http://www.bild.me/bild.php?file=7570013helloworld01.jpg

One catch-22 was that emulation required hardware acceleration, but that
wouldn't work for me, so I can _only_ run on the phone right now (which
isn't too bad, for now) until I figure out a way around that gotcha.

Later, I'll deal with getting a hello world to work on the iOS devices.
https://www.androidauthority.com/developing-for-android-vs-ios-697304/