I am New In ANDROID DEVELOPMENT

I am New In ANDROID DEVELOPMENT

I am new in development and now i am working in small company
i am in trouble also...!!
company people kept me in android development where for me android
development is totally new and so kindly help me for following question :
Tell me best sites for beginner developer for android expecting
http://developer.google
Where I will get best example for android development
customizing theme / views etc related also i want best documents / source
code
from where i will get best source code for android which is useful for
professional level developer