shell script to install Android SDK from CLI

android_bootstrap.sh

#!/bin/bash

ANDROID_ARCHIVE="android-sdk_r20.0.3-linux.tgz"
ANDROID_URL="http://dl.google.com/android/$ANDROID_ARCHIVE"
BASE_DIR="/opt/androidsdk"
ANDROID_BIN="$BASE_DIR/android-sdk-linux/tools/android"
ANDROID_VERSIONS="android-8,android-10"

### Pre checks ########

has_error="0"

CURL_BIN=`which curl`

if [ "0" != "$?" ]; then
	echo "curl is required: sudo apt-get install curl"
	has_error=1
fi
if [ ! `which java` ]; then
	echo "java not found: sudo apt-get install default-jre"
	has_error=1
fi
if [ ! -w $BASE_DIR ]; then
	echo "Unable to write to $BASE_DIR"
	has_error=1
fi
if [ "$has_error" -eq "1" ]; then
	echo -e "\nPlease fix above errors."
	exit 1
fi


if [ ! -e $BASE_DIR/$ANDROID_ARCHIVE ]; then
	(cd $BASE_DIR && curl "$ANDROID_URL" -o $BASE_DIR/$ANDROID_ARCHIVE ) \
		|| (fatal "Download failed"; rm $BASE_DIR/$ANDROID_ARCHIVE) \
		&& echo "Download successful"
else
	echo "Found Android SDK $BASE_DIR/$ANDROID_ARCHIVE"
	echo "...skipped dowloading"
fi

if [ ! -e "$BASE_DIR/android-sdk-linux" ]; then
	echo "Uncompressing Android SDK..."
	(cd $BASE_DIR && tar -xzvf "$BASE_DIR/$ANDROID_ARCHIVE")
else
	echo "Found uncompressed Android SDK in $BASE_DIR/android-sdk-linux"
	echo "...skipped uncompressing"
fi

$ANDROID_BIN --verbose update sdk -u --filter $ANDROID_VERSIONS


### Helper functions
warn() {
	echo "$*"
}

fatal() {
	warn "$*"
	exit 1
}