Creating App Similar To Navigator?

i am creating an app similar to navigator, only that it is not restricted to US only,

now, it works as follows

1) user speaks the destination location, which is converted to text, sent to google maps for processing

2) google maps calculates route between current location and destination location, sends back the route, in text form

3) this text is converted back to speech using text to speech converter, issued to user

till now, i have set up the sdk,adk,eclipse and adt, enabled google maps after getting the key from google using keytool, have the working code for text to speech converter, and i can get my current location(of emulator) using coordinated sent by eclipse.

Thing is, how do i integrate all thees independent modules?