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

Java always allows you to call "native code" components. However, you want to avoid them if possible because they can introduce subtle bugs and platform dependencies into your code.

I don't believe you can code a whole application for Android in C/C++ however -- you must have a Java wrapper at the very least.