How can a translation service be called in an Android app? Can we have an app that can translate multiple languages into another?
Edit - Google have deprecated the Translation API due to "misuse". Apertium is a possible alternative.
You asked:
How can a translation service be called in an Android app?
Google Translate would seem to be the obvious service to use in an Android App.
There is an unofficial Java client API you could use in your application to make the calls to Google Translate.
If you use this, make sure you give your application the INTERNET permission so it can make the appropriate network connections.
Can we have an app that can translate multiple languages into another?
It's definitely possible to create an Android app to do this because Google already have made a Google Translate application, as have lots of other people.