Android seeking connection to the database, a registered, demo login

I am a rookie, just touch android, android seeking connection to the database, there are registration, demo login, prawn can be sent to the younger one, grateful. In addition, this platform I downloaded a demo, after importing all wrong, my question is how the environment is not clear. Online wait.<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->