Generate XML state resources for all graphics in an Android project

gen-button-states.sh

#!/bin/sh
# Script to generate XML state files for button images in a project
# This script assumes that you have named your graphics like: button_normal.png, button_pressed.png

function help() {
  printf "Usage: %s [Android Sources]\n" $0
  exit 1
}

androidSourceRoot=$1
[ -z "$androidSourceRoot" ] && help

function generateStateList() {
  graphic=$1
  graphicBaseName=`basename ${graphic}`
  graphicBaseName=${graphicBaseName%%_pressed*}
  graphicNormalName="${graphicBaseName}_normal"
  graphicPressedName="${graphicBaseName}_pressed"
  stateListFilename="$androidSourceRoot/res/drawable/${graphicBaseName}.xml"

  printf "Generating '%s'\n" $stateListFilename
  printf -v fileOutput "%s\n" "<?xml version=\"1.0\" encoding=\"utf-8\"?>" \
    "<selector xmlns:android=\"http://schemas.android.com/apk/res/android\">" \
    "  <item android:drawable=\"@drawable/${graphicNormalName}\" android:state_pressed=\"false\"/>" \
    "  <item android:drawable=\"@drawable/${graphicPressedName}\" android:state_pressed=\"true\"/>" \
    "</selector>"
  printf "%s" "$fileOutput" > "$stateListFilename"
}

for graphic in $androidSourceRoot/res/drawable/*_pressed.png
do
  generateStateList $graphic
done