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I need the users to register to my website with login and password.
basically i need to do the following
1.Connect android app with the database from a website.
2.Store some information into the database.
3.retrieve some information back from the database.
I have already experience with the standard sqlite build in android apps. The problem is, I need to let people register my website and retrive some information
To store or retrieve any information stored on a Database on a web server, you will need to create a simple web service that will pass the requests to the database and then return the results from the database back to Android in a format Android can understand. You can typically send the data in POST or REST and then retrieve the data in JSON format.
There is a very good example of how you could achieve that using PHP here. Here you would send requests from Android to the PHP script(hosted on the server) using POST and then the script would return the results in JSON format, which in turn can be parsed by Android to get the desired result.
This is the basic method in which complex web services like twitter, facebook and the like operate. Most of the interaction is done with REST & JSON.