Question

The android app stores the data in SQLite database during the offline mode. When online I want the app to sync (in both direction) with the datastore(database) in cloud server (App Engine). How do I implement this functionality, so that I can show the data captured on phone on a web application. Also please suggest any simple alternative way if any..

Answer 1

I just write out my data as a String (using a format I can reconstruct my data with), pass that to AE, parse it and store/display it.

You could use json too.

or try http://mylifewithandroid.blogspot.jp/2010/10/client-server-communication-with-json.html

for the sync part I use a timestamp. If the timestamped result isn’t recorded on the server, I record it. I send back the recorded stamps to the client and delete them from the store. Of course the server can also send back new results if a user’s records were updated from a different client.