Store/retrieve private key into android system keystore without using any file or sharedpreference

Question

I want to store and retrieve private data(key) into android system keystore, but I have found everywhere file stream is created for temporary usage.

Below link works fine but they are using temp file.

KeyStore getKey() returning null in Android

But I want to save my data into android system keystore without using any file or shared preference.

How can it be done?

Thanks in Advance!