マテリアルデザインのアイコン( https://github.com/google/material-design-icons )を簡単に使えるようにしたかった．icon.txtのように使うアイコンを指定して，./icon_picker.shを走らせると，iconsディレクトリ内にAndroid用のリソースが抽出できる（白アイコンだけ）．

icon.txt

navigation/refresh
content/add
action/delete
action/get_app
image/rotate_left
image/rotate_right
content/reply
content/reply_all
av/repeat
toggle/star
toggle/star_outline
action/question_answer
action/open_in_browser
action/open_in_new
action/home
communication/email
action/list
social/group
action/settings
content/send
content/create
editor/insert_photo
image/camera_alt
navigation/expand_more
navigation/expand_less
social/person_add
action/verified_user
action/lock

icon_picker.sh

#!/bin/sh
ICON_FILE=icon.txt
SRC_DIR=material-design-icons
DST_DIR=icons

if [ -e $DST_DIR ]; then
	rm -r $DST_DIR
fi

while read target; do
	echo $target
	param=(`echo $target | tr -s '/' ' '`)
	for file_path in `find $SRC_DIR -type f | grep drawable | grep ${param[0]} | grep ic_${param[1]}_white `; do
		file_name=${file_path##*/}
		dir_path=${file_path%/ic_*}
		dpi_dir=${dir_path##*/}
		if [ ! -e $DST_DIR/$dpi_dir ]; then
			mkdir -p $DST_DIR/$dpi_dir
		fi
		echo "copy $file_path"
		cp $file_path $DST_DIR/$dpi_dir/$file_name
	done
done < $ICON_FILE