Friday, May 22, 2009


Well, that was easy.

So I created a new Google AppEngine project in Python: a very simple one, which just takes a particular HTTP POST request, stores its values to the datastore, and displays them on-screen. Then I added a "upload" function to my Android's DbHelper class, and connected the latter to the former.

I expected the debugging to be messy and lengthy. But whaddaya know? All I had to do was add the INTERNET permission to my AndroidManifest.xml, and correct the URL that I was pointing to (I'm running the AppEngine app locally; the Android emulator has a special IP address,, to connect to its host machine) and poof, amazingly, It Just Worked.

Here's the Android code, in case anyone needs an example:

public boolean uploadNote(long rowId, String location, String title, String comments, String picturePath) {
try {

DefaultHttpClient httpclient = new DefaultHttpClient();
httpclient.getParams().setParameter("http.useragent", Util.AppName);
HttpPost httpost = new HttpPost(Util.wtwSite); // temporarily

Log.i(""+this, "Preparing to post to "+Util.wtwSite);

List paramList = new LinkedList();
paramList.add(new BasicNameValuePair("email", Util.GetUserEmail()));
paramList.add(new BasicNameValuePair("title", title));
paramList.add(new BasicNameValuePair("location", location));
paramList.add(new BasicNameValuePair("comments", comments));
paramList.add(new BasicNameValuePair("image", picturePath));
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,
HttpResponse response = httpclient.execute(httpost);
Log.i(""+this, "Sent POST, got " + response.getStatusLine());


return true;
catch (IOException ex)
Log.e(""+this, "Could not upload note with row "+rowId+ " due to "+ex, ex);
return false;

I'm not even going to bother posting the server code, as it's so simple; 70 lines of Python, and 30 lines of HTML.

You'll note at the moment I just upload a picture URL, rather than actual data, but I'm going to move to doing the latter eventually.

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