Since getting a Nexus One I’ve been wanting to dabble with programming something for it, Java seemed far too hard. However, I quickly came across Scripting Layer for Android (SL4A) which lets you write quick scripts in a variety of languages; including my favourite, Python. The next challenge was to actually come up with a simple project to get my hands dirty.

Matt Cutts wrote a simple script that scans a barcode and pulls up its Google Books page, from which you can then click the ‘add to my library’ button, but this seemed far too clumsy and slow to me, so I settled on improving it. The script now lets you scan multiple books in series and then add them to your Google library by making use of the Google Books Search API.

See the code (public domain) below:

import android
from gdata.books.service import BookService
import gdata.books

email = 'youremail@gmail.com'
password = 'yourpassword'

droid = android.Android()

def dialog(items):
  title = 'Another?'
  droid.dialogCreateAlert(title)
  droid.dialogSetItems(items)
  droid.dialogSetPositiveButtonText('Add')
  droid.dialogSetNegativeButtonText('Exit')
  droid.dialogSetNeutralButtonText('Upload')
  droid.dialogShow()
  response = droid.dialogGetResponse().result
  return response['which']

def add_from_queue(self):
   for k,b in self.queue.items():
      self.add_item_to_library(b)
   return(True)

def get_by_barcode(self):
   (id, result, error) = droid.scanBarcode()
   if result is not True:
      return(False)
   isbn = int(result['extras']['SCAN_RESULT'])
   q = 'ISBN'+str(isbn)
   b = self.search(q, feed=self.ITEM_FEED).entry[0]
   self.queue[b.dc_title[0].text] = b
   return(True)

gdata.books.service.BookService.get_by_barcode = get_by_barcode
gdata.books.service.BookService.add_from_queue = add_from_queue
gdata.books.service.BookService.queue = {}
gdata.books.service.BookService.ITEM_FEED = gdata.books.service.ITEM_FEED

service = gdata.books.service.BookService()
service.ClientLogin(email, password)

service.get_by_barcode()

i = True
while i:
  response = dialog(service.queue.keys())

  if response == 'positive':
     service.get_by_barcode()

  elif response == 'neutral':
     service.add_from_queue()
     service.queue = {}

  else:
     i = False

droid.exit()

Updated: Thanks to sjb for pointing out a bug in the code; now fixed.

I’ll probably try to work it directly into this blog (or somewhere else on the website) at some point, but that will have to wait for a little while.

Oh, and a Merry Christmas to the Christians out there.

I’m thinking of three words: one means “a mythical being”, the second is “the name of a building material”, and the third is “a unit of time”, What words do I have in mind?

It’s not difficult to think of three words that fit the descriptions, but it is unlikely you’ll pick the three I had in mind. Now try a second task:

This time I’m looking for rhyming words. I’m thinking of three words: one rhymes with “post”, the second with “eel” and the third with “ear”. What words am I thinking of?

Again, you can think of three words which match the descriptions easily, but which ones did I have in mind, last but not least:

Suppose I tell you the words I seek are the same in both tasks: What is a word that means a mythical being and rhymes with “post”? What word is the name of a building material and rhymes with “eel”? And what word is a unit of time and rhymes with “ear”?

Now the task is easy, the combination of just two constraints reduces the selection until there are only three words which fit… “ghost”, “steel” and “year”!

This was taken from a book I’m rather enjoying called “The Design of Everyday Things” by Donald A. Norman which is a bit of an engineers book to be honest, but is good bed time reading all the same (or whisky supping reading at least!)

(and no this isn’t one of those horrible pay per post things, if you want to read it try a library )