how long it takes that i can make a good android app when i am just learning the java programming?

Answer 1

1 month (with constant updating...)

Answer 2

I don't know exactly.. When you got a good level in Java programming you can approach Android platform.. at this point you need to get (or choose) a good sdk environment and find same good examples to learn. You will notice that the language would change a bit (using some proprietary commands) with a different logic..