What do I need for building a community (android application)?
<p>I have already experiences in devoloping android apps and i am working on a new android application. But I have several problems to build a concept for this new application. So I really hope that you share some of your experiences with me...</p>

<p>My android app should be like a little community where people have there own profil and can exchange messages or other things like pictures and so on with each other. (It is like an empty room where the user can leave something interesting which other people can have a look on). But what do I need for this? </p>

<p>I already thought that the people have to register and log in (username and password) - but where should I save the user informations and what about the security? </p>

<p>How do I have to handle the things which the users upload to the community? And where can I save additional user informations? </p>

<p>I guess that I need a server for doing all those operations (with a database and special structures?!). But I have never worked with something like that before. So what are the things I have to care for and who can give me some advise for planing my app?</p>

<p>Thank you very much for every help. This project is very important and i am very thankful for every idea and advice!</p>
