How can I connect my android app with mysql to use centralized storage? I want to do this in web android app not native one.

As Asif said, you can build a web services that communicates with the database and pass data to your application using json. This tutorial might give you some ideas:

How To Write A Simple PHP/MySQL Web Service

If you are creating a native app, it could be easier to use a backend provider such as Amazon Web Services of Windows Azure Mobile Services which make it very easy to create a scalable backend system in minutes. 

Aoa,

Thanks for your patience,

Use web services for this problem by json technology.

If you further requires help in this regards please feel free to ask.

Thanks,

Asif Javed

 you can build a web services that communicates with the remote database from your android application.

normally process go like this

ANDROID APPLICATION -----> PHP FILE ----> REMOTE DATABASE

for this you can try RESTFUL Web service.  for more info go to follwing url.

http://stackoverflow.com/questions//how-implement-restful-services-in-android

JSON is the way to go. All of the major social networks use the same patterns for creating and consuming data.

You can make a simple WEB SERVICE, which will recieve the request and compare with the online DB and sends the result.

you can read more here

Use MySQL in server side to store your DB by using  PHP or  .Net by using Json technology

U can find many example.

A simple web service (php or .net) will do the trick. Just manage the security settings when passing data from mobile to central database servers. Cheers!

i use basic4android it can connect direcly to remote MySql databases , sql server etc ...

Check it out 

http://www.basic4ppc.com/android/forum/threads/remote-database-connector-connect-to-any-remote-db.31540/

 the easy way is to provide rest API  using php/ servlet or any web language  to access ur data  and mobile can hit   them via http request