images2android.sh

type mogrify >/dev/null 2>&1 || { echo >&2 "» This script requires mogrify. Please install ImageMagick first!"; exit 1; }

IOS_IMAGE_PATH="$1"
OUTPUT_PATH="$2"

mkdir -p $OUTPUT_PATH/res/drawable-hdpi $OUTPUT_PATH/res/drawable-mdpi $OUTPUT_PATH/res/drawable-xhdpi

echo " » Copy all resources to MDPI, this is"
echo "   the same density as a non-retina iOS device"
find "${IOS_IMAGE_PATH}"/* -type f -exec cp {} ${OUTPUT_PATH}/res/drawable-mdpi/ \;
 
echo " » Move the retina resources to XHDPI, which"
echo "   has the same density as a retina iOS device"
find ${OUTPUT_PATH}/res/drawable-mdpi/* -type f -regex ".*@2x.*" -exec mv {} ${OUTPUT_PATH}/res/drawable-xhdpi/ \;

echo " » Remove @2x from XHDPI filenames"
find ${OUTPUT_PATH}/res/drawable-xhdpi/* -type f -exec bash -c 'file={}; mv $file ${file/@2x/}' \;
 
echo " » Generate HDPI by copying XHDPI and resize these by 75%"
 
cp -R ${OUTPUT_PATH}/res/drawable-xhdpi/* ${OUTPUT_PATH}/res/drawable-hdpi/
find ${OUTPUT_PATH}/res/drawable-hdpi/* -type f -exec mogrify -resize 75% {} \;
 
echo " » Done!"

I've updated the gist to support transforming images from a single input directory to standard Android directories instead of Titanium drawable.