lineage os

Fork/distribution without as much awfulness.

development

https://www.kuon.ch/post/2020-01-12-android-app/

Setting up an android development SDK is a huge pain in the ass. The first step is installing java and setting your JAVA_HOME variable.

Download android studio, which is a massive gui IDE or scroll to the bottom of this page and get the command line tools:
https://developer.android.com/studio

Once you have the command line tools, put them in a folder structure like this:
$HOME/.local/opt/android-sdk/cmdline-tools/latest/bin

Note that when you extract them it wont have the latest folder so you need to move the contents. Anyway, once you managed that add it to your path and run the suggested commands from this page to get one or more sdk's:
https://developer.android.com/studio/command-line/sdkmanager

If you're trying to use flutter you probably also need "build-tools;30.0.3" per this random stack exchange thread:
https://stackoverflow.com/questions/53986067/no-valid-android-sdk-platforms

publishing

For google play store you need to generate a local upload key:
keytool -genkey -v -keystore ~/upload-keystore.jks -keyalg RSA -keysize 2048 -validity 10000 -alias upload

adb

I also added the platform-tools folder to my path since that contains adb which is needed for rooting your phone or sending development apps to it. My path looks like this:
$HOME/.local/opt/android-sdk/cmdline-tools/latest/bin:$HOME/.local/opt/android-sdk/platform-tools

To actually use adb you need added to the plugdev and adbusers groups:\

sudo usermod -aG plugdev $LOGNAME
sudo usermod -aG adbusers $LOGNAME