Ubuntu/Android/SDK/AVD

Overview

Done on Ubuntu 20.04 LTS.
Installed without Android Studio

Download Prerequisites

Get the commandline tools.
https://developer.android.com/studio > Download options > commandlinetools-linux-7583922_latest.zip

~$ wget https://dl.google.com/android/repository/commandlinetools-linux-7583922_latest.zip

Make the directory Android SDK/AVD will live in.

~$ sudo mkdir /opt/android

Unzip

~$ sudo unzip ~/commandlinetools-linux-7583922_latest.zip -d /opt/android

Move sdkmanager

~$ sudo mkdir /opt/android/cmdline-tools/latest
~$ sudo mv /opt/android/cmdline-tools/bin/sdkmanager /opt/android/cmdline-tools/latest

Set Env Vars and Path

I had to do this in a few places. root, user, and sudoers.

root & user

Create a bash_alias for root, modify .profile for user. Same data in both.

~$ sudo touch /root/.bash_aliases
~$ sudo vim /root/.bash_aliases
~$ sudo vim ~/.profile

# set PATH so it includes android sdk emulator if it exists
if [ -d "/opt/android/emulator" ] ; then
    PATH="/opt/android/emulator:$PATH"
fi

# set PATH so it includes android sdk platform tools if it exists
if [ -d "/opt/android/platform-tools" ] ; then
    PATH="/opt/android/platform-tools:$PATH"
fi

# set PATH so it includes android sdk command line tools if it exists
if [ -d "/opt/android/cmdline-tools" ] ; then
    PATH="/opt/android/cmdline-tools:$PATH"
fi

# set PATH so it includes android sdk command line tools bin if it exists
if [ -d "/opt/android/cmdline-tools/bin" ] ; then
    PATH="/opt/android/cmdline-tools/bin:$PATH"
    ANDROID_SDK_ROOT="/opt/android"
    ANDROID_HOME="/opt/android"
fi

# set PATH so it includes android sdk command line tools if it exists
if [ -d "/opt/android/cmdline-tools/latest" ] ; then
    PATH="/opt/android/cmdline-tools/latest:$PATH"
fi

sudoers

use sudo visudo then add the following to the Defaults secure_path=

Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/opt/android/cmdline-tools/bin:/opt/android/cmdline-tools/latest:/opt/android/emulator:/opt/android/platform-tools"