I like to make a very simple app for Android using Google maps API.
The first version of the app just needs to overlay street parking over the top of a Google map with the default view current location using GPS.
Once the user clicks on a space/street a pop up bubble will need to be displayed with the parking restrictions (See attached files).
A interface will need to be created so new street parking can be add by an administrator without any programming knowledge.
This is only a short brief and of course you would need more information so please feel free to ask.