Android: Java, C or C++?

Question

I wrote some simple apps in Android using Java.
But later I found this:

It provides headers and libraries that allow you to build activities, hand

Answer 1

This is good question, AFAIK, c or c++ comes into picture when you really want to program something core dalvik feature than using Android API as specified you question, something like sensor related features or hardware.

If you want build app using API, it will be mostly in Java/XML.