Android Development Language JAVA Or C++M?

Yes - stick to C / C++
Use an independent "cross platform" development system.

Marmalade, Unreal engine or any of many others..

You can create an app once in C then compile for any supported target - android, ios, windows, mac, linux, consoles etc. etc..

http://docs.marmalade.shop/display/MD/Home
https://www.unrealengine.com/en-US/what-is-unreal-engine-4

To me it's idiotic to use a language that cannot be used on other devices / systems in similar classes. Each device or OS makers own language or development system either ties you in to a certain system or locks you out of others (or both).

A language that can work on all means you only write once and have one source to maintain, no matter how many how many target devices you build for.

There's the NDK, where you get to use C++. However, only in addition to Java, and it's strongly recommended not to use that unless really necessary.

In my humble opinion, don't even try to go down that road. Take a look at Java, and developing a basic app, and I'm pretty sure you won't find it as hard as German at all. Java and C++ are cousins. Maybe somewhat distant cousins, but cousins nonetheless.