Convert dp dimensions to px dimensions, rewriting .xml files in place.

dp2px.py

"Convert dp dimensions to px dimensions, rewriting .xml files in place."
# Rewrite all .xml files in res/ with:
# find res -name '*.xml' | xargs python dp2px.py

import decimal
import re
import sys


# scale = getResources().getDisplayMetrics().density; // In Activity.
dip_re = re.compile('"(.*)dp"') # works just as well with sp.
scale = 1.5


def process_file(filename, logfile=sys.stderr):
    modified = False
    body = ''
    for line in open(filename):
        match = dip_re.search(line)
        if match is not None:
            modified = True
            dips = decimal.Decimal(match.group(1))
            pixels = dips * decimal.Decimal(scale)
            body += dip_re.sub('"{0}px"'.format(pixels), line)
        else:
            body += line
    if modified:
        logfile.write('Updating {0}.\n'.format(filename))
        open(filename, 'w').write(body)


if __name__ == '__main__':
    if len(sys.argv) == 1:
        sys.stderr.write('usage: {0} xml_filename\n'.format(sys.argv[0]))
        sys.exit(1)
    for filename in sys.argv[1:]:
        process_file(filename)

Why would you want to do this? If you are working with a device that does not support scaling, either by limitation or by bug.