If Google is a "thought leader" why didn't they use another language for Android? The more you digg into the languages, the more you see, that Java rules them

If Google is a "thought leader" why didn't they use another language for Android? The more you digg into the languages, the more you see, that Java rules them all... I've tried MANY, MANY languages (from assembler, Basic, Pascal, C, C++, Smalltalk, C#, Python, Ruby/Rails, Groovy, PHP, Perl, awful JavaScript which shouldn't be called a language at all, because it has bugs built in it and many others) and nobody is forcing me to use Java, but I program my Rasberry Pi-s only in Java... With latest Rasbperian Wheezy where Oracle JDK is included I can tell you it is super cool and super fast for this small ARM processor... I will not use Python on it... Either Java or C - nothing else do I need...