simple android web example 10$budget -- 2

i need a simple android app that can store data like in my case username password, and show them as list.
and from list if I click on list it should open for edit (update) details, and if I click on a button then it will open a webview and fill it on facebook that's it. I'm a beginer and my budget is low so don't bid if you can't do this on my budget