Short answer yes you can.
If we used some of the files in Kotlin language and some in java?
You can use both java and Kotlin in a single class file.
Does it affect at the time of uploading in playstore?
No
Best way or tutorial to learn kotlin?
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Kotlin for android developers ebook
I had also tried flutter but as I don’t have much knowledge of dart language.So I switch towards kotlin. Let me know I am right or wrong?
Yes, you are. However you can also play with Flutter besides Kotlin. Its pretty cool.
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solved Can we build Kotin and Java Mix application? [closed]