Flipkart competes with iBooks on the App store and Google books on the play store as well as Amazon (which has Audible). iBooks doesn’t have this feature yet.
You can turn off the screen and only listen to the book. Now, I’ve tried this feature out on the Android app before. To call a spade a spade: its not even close to real audio books that you find on services like Audible.com (an Amazon company).
But of course that is to be expected as it is uses the text to speech engine installed on the phone.
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