android - why .format crashes an app only on device?

Question

while testing the app that I'm working on right now I stepped into weird problem, my app works fine on emulator but crashes on my device(huawei p9, I don't know if it really matters). It seems like this two particular lines of code are reason of crash(app works fine on device after removing this formatting code):

val formatedBruttoPrice = "%.2f".format(price).toDouble()         // price is a double
val formated            = "%.2f".format(totalPrice).toDouble()    // totalPrice is also a double

The error that I get java.lang.NumberFormatException: For input string: "2,0"

Any ideas why? And how to fix this?

question from:https://stackoverflow.com/questions/66059334/why-format-crashes-an-app-only-on-device

Answer 1

That is due to differences in locales. The emulator converts 2.0 to "2.0" due to english locales, but your device uses something else which produces "2,0". Then you are calling .toDouble() so it tries to parse. So you went from double to string to double. Just remove the .toDouble() calls and use the strings instead.