Obviously you can make android applications with Kotlin without any Java Code.
But at the same time, You will need to learn Java also, as all the external libraries on
github are written in java.
Still in near future, we will see libraries written in kotlin also.
Here I found out the series of tutorials which have both formats, Java and Kotlin :
kotlin android tutorial for beginners
Go through basics of java and it is not so tough and also required to get good job in good company.
But do not leave kotlin as it is the future for android development.