The script i used to automate the building process of a suite of games

build.sh

#!/bin/bash
create ./export it.wink.$1 $1

# copy new project into decompiled `www` folder
cp -R -p $1/* export/assets/www/

# fix an issue with lib import
sed -i "s/<script src=\"phonegap.js\"><\/script>/<script src=\"cordova-2.6.0.js\"><\/script>/g"  export/assets/www/index.html
# set the splash screen
mv export/assets/www/splash.png export/res/drawable/splash.png
# remove useless resources
\rm -R export/res/drawable-xhdpi
\rm -R export/res/drawable-hdpi
\rm -R export/res/drawable-mdpi
\rm -R export/res/drawable-ldpi 
cd export
# build for debugging
./cordova/build
mv bin/$1-debug.apk ../
cd ..
\rm -R $1 export

# signs the apk
java -jar SignApk/signapk.jar SignApk/certificate.pem SignApk/key.pk8 $1 .
# given that you have the SignApk tool folder