Install Android SDK CLI Ubuntu 20.04 WSL2.sh

#!/usr/bin/env sh
# Install Android SDK CLI Ubuntu 20.04 WSL2

# Functions
appendIfExists() {
  if [ -f "$1" ]; then
    cat >> "$1"
  else
    echo "File $1 does not exist. Discarding output." >&2
    return 1
  fi
}

include () {
    if [ -f "$1" ]; then
      source "$1"
    fi
}

# Variables
export DEBIAN_FRONTEND=noninteractive
export ANDROID_HOME=$HOME/android/sdk
export CMD_TOOLS_VERSION="commandlinetools-linux-6200805_latest"
export BUILD_TOOLS_VERSION="28.0.3"
export ANDROID_VERSION="android-28"

# Install Open JDK 8
sudo apt-get update && sudo apt-get install unzip libc6-dev-i386 lib32z1 openjdk-8-jdk-headless -y

# Install Android SDK
wget "https://dl.google.com/android/repository/$CMD_TOOLS_VERSION.zip"
mkdir -p "$HOME/android"
mkdir -p "$HOME/android/sdk"
unzip $CMD_TOOLS_VERSION -d "android/sdk/"
rm -rf "$CMD_TOOLS_VERSION.zip"

# Make sure emulator path comes before tools. Had trouble on Ubuntu with emulator from /tools being loaded
# instead of the one from /emulator
echo 'export PATH="$ANDROID_HOME/emulator:$ANDROID_HOME/tools:$ANDROID_HOME/tools/bin:$ANDROID_HOME/platform-tools:$PATH"' | appendIfExists $HOME/.bashrc
echo 'export PATH="$ANDROID_HOME/emulator:$ANDROID_HOME/tools:$ANDROID_HOME/tools/bin:$ANDROID_HOME/platform-tools:$PATH"' | appendIfExists $HOME/.zshrc

# Source profile
include "$HOME/.bashrc"
include "$HOME/.zshrc"

# Start sdkmanager
sdkmanager --sdk_root=${ANDROID_HOME} "tools"

# Update
sdkmanager --update
sdkmanager --list
sdkmanager "build-tools;$BUILD_TOOLS_VERSION" "platform-tools" "platforms;$ANDROID_VERSION" "tools"
sdkmanager --licenses
sudo apt install gradle -y