Getting more out of

 Android, Python  Comments Off on Getting more out of
Nov 292011

So, I’m hacking on a Python for Android project, which is built over top of the SL4A project. I’m currently using the remote method of development where you fire up an interpreter and share it in public mode. Then you import and instantiate an instance of Android with IP and Port information of your public server. You can then hack in your favorite editor on a laptop instead of using a thumb-board or other. It looks like this:

import android  # The SL4A module should be on your sys.path.

ip = '192.168.x.xxxx'
port = 35766
droid = android.Android((ip, port))

What happens is the __getattr__ method of the Android object uses magic to change droid.getenvironment() into an RPC call to the public server and then return the result back as a named tuple. Nice. Being the nosey bugger that I tend to be, I modified the code to add a debug param to the __init__ method, that when set, would print out what was being sent out over RPC and then the raw tuple results. A snippet of the modification goes like this:

  def __getattr__(self, name):
    def rpc_call(*args):
      if self._debug:
          print "droid.%s%s" % (name, str(args))
      res = self._rpc(name, *args)
      if self._debug:
          print "\t%s" % str(res)
      return res
    return rpc_call

You can easily see where I put my “if self._debug” logic in place. Now if I use my modified I can turn on the debug flag and get some 411 on the magic that is going on. It ends up looking like this:

	Result(id=28, result=None, error=None)
	Result(id=29, result={u'data': u'@end', u'name': u'dmt:fromClient.speak', u'time': 1322542655069000L}, error=None)
	Result(id=30, result=None, error=None)
 Posted by at 12:49 am

SL4A, Python, webViewShow – a faster dev mode

 Android, Python  Comments Off on SL4A, Python, webViewShow – a faster dev mode
Nov 262011

While I was playing around with Python for Andoid, I was using the webViewShow method to load an interactive html page and set up message passing both from

html/js -> python

and from

python -> html/js

Part of this requires that I knock out and hack some html/js code. However, I am using the Remote method with a public server on my android device, since I am too lazy to set up eclipse and a full blown android dev env. The example code they show, uses an html file located on the sdcard of the device. Of course this brings its own problems, since now I have to mount, edit, unmount between each hack cycle. Ick. Well I could just tell it to load the html from an off device server, but being lazy ( I think I mentioned that already. ) I didn’t want to rsync back and forth to my remote server, set up directories, etc. Also, I didn’t want to set up a Django install just to serve a hacky html script.

So I think to myself, man there has to be some light-weight way to serve this up locally while I’m hacking. So I think, hey CherryPy, but then I remember Edna and it hits me, I can serve static pages out of a directory with just python. A little google-fu and this page appears, giving just the needed incantation.

 python -m SimpleHTTPServer 8080

Which happily serves everything out of the directories below it on the specified port (8080 in this case). I make a little adjustment in to my webViewShow and change it from file:/// to http://my-dev-ip:8080/thefile.html and all is good with the world. As I hack, changes to the html are pulled and served immediately.

Did I mention, Python Rocks!

 Posted by at 1:13 am